What I am wondering is this the sound that the timing tensioner makes when it is having problems?. When turning the key, I hold it in the "start the damn car" position and nothing. The humming sound is probably the fuel pump itself. Try to listen for the noise with the hood up to see exactly which part it is coming from. As I said, with everything electric off except engine, it's still there and doesn't sound like it's coming from the speakers. it only runs for a bit and then shuts off. The humming sound lasts 5-6 seconds, and it can be 5 to 10 minutes apart. What part could have broken to cause all of these problems?. Started today out of the blue. When flipping the throttle by hand and listening from the boot aperture it seems to be coming from the inlet manifold area but i haven't had the engine cover off and had a good investigation. Cause of RAV4's whining noise baffles 3 mechanics 2012 RAV4s dealing with a whining noise corrected by replacing the engine insulators/mounts. 8T and heard this humming noise after I turned off the car. I hear a loud fan whirring away inside the bonnet. What else could be causing the noise? A: There are many potential causes for a noise of this type. Not all of the time though! This brings me to tonight. Suspension failures will make a low groaning noise, and a bearing failure in the engine or a flat tire are known to cause a loud roaring noise. This might sound kinda dumb but when is the last time you changed your air filter. What else could be causing the noise? A: There are many potential causes for a noise of this type. If the noise still persists, then the problem lies somewhere in the drivetrain or transmission. I just took delivery of my mk7 1. I just got an '05 Prius with 70k miles and I'm still trying to figure it out. The motor was perfect when new, it was very quiet and ran great. Accelerate the car to speeds at which the whining noise is the loudest, switch to neutral gear and kill the engine. Pop the hood, turn off the truck and watch the fans. It should come on as soon as you turn on the ignition. I have to phone them back on Monday. Drove for a few minutes and realised the noise was following me so pulled in and stopped the engine, noise kept going. Only noticeable when the motor and engine oil are cold. The timing belt with water pump was changed 30k miles ago. The drive belt seems old but spray belt dressing does not make ANY difference to the noise. Whirring noises which change with engine RPM are normally things like Power Steering pump, or Alternator. AN EMPTY BARREL ALWAYS MAKES THE MOST NOISE. Just bought a "new to me" '97 Jeep Wrangler SE; 2. ) Metal on metal grating noise No clip of this one yet. Ever since I got it, many times (but not all) when I pull in garage turn off engine I hear sort of a humming noise, seems to be from dash. Humming/high pitched noise, stops when brakes applied Hi everybody, After reading john420’s story about humming noise, which probably came from a stuck emergency brake, I thought I share my experience with a humming/pitched noise. is this normal does yours do it. Engine Piston Noises; Hose Noises; Noises from Belts & Pulleys; Under The Car. Noisy engine mount rattle, Idle Relearn. 6 TDI yesterday (may post pics after this snow has cleared) and I noticed after driving 40 mins yesterday to a colleagues house after I turned the engine off and got out the car there was loud fan noises coming from the engine. Getting the whole engine assembly checked might narrow down the problem to some loose component or misalignment. It was something in the engine. Hi guys, I need your help. Last night my wife came home and told me that the car was making some whirring/whining sound with the engine turned off and no key in the ignition. Eventually after a mile or so, its normal again. The sound stops after few minutes or so. Worth a try if you are certain the noise is actually coming from the transmission though. Have any B250 owners noticed any noises coming from the engine compartment after they shut the engine off? I've been noticing on mine it sounds like there's a compressor motor or fan going for about 2 or 3 seconds after the engine shuts off. After shutting off the car I can hear a fairly loud electrical buzzing sound from the engine compartment. I have been chasing this problem for several months, and it was getting so my bike wasn't fun to ride anymore, as the engine noise seemed louder than my exhaust, especially when I have the windshield on, it tends to amplify all the sounds coming from the engine. If one of your radiator fan blades gets even a little out of whack, it can start to vibrate, or even contact the fan shroud around it. Now it’s making this weird whining sound like a vibration. And then there are other noises that are decidedly unpleasant and unnerving to hear. I thought it may be the fans, but I checked and its not. It is making a whining noise that starts as soon as you fire it up and gets worse with acceleration. Next, look at your furnace. The noise carries on even when i take the keys out and lock the car. After driving a few miles it gets quieter until it stops. Hi, Have had my 08 forester for nearly 8 months and I have just noticed a ticking noise from the engine after I shut the engine off. Got 46k on the CTD and noticed that nearly every time I shut off the car, I get there is a humming noise that lasts for about 5-10. all AWD cars regardless of manufacturer produce some normal gear whine. Start the motor up and verify the noise is there. The noise starts about 20 mph and will do it all the way up. Still buzzing after about 5 minutes. I have an 05 GLI 1. Noise is never just about sound; it is inseparable from issues of power and powerlessness. Weird humming/buzzing noise after car is off? have a new 2017 5. It's not the fan, its electrical. I have a manual 2C engine and just notice a whining/whistling directly linked to engine revs, it almost sounds like I have a turbo when shifting from 1st-4th and when I engage the clutch the sound is temporarly gone. If the whining sound occurs when you shift the gear to the Reverse or Forward and it goes away after moving to the Neutral mode, the torque converter must be having a problem. If a whirring noise is coming from the center of the car and it has an automatic transmission then you could have a filter that is plugged. 8T and heard this humming noise after I turned off the car. Also try to drive "off boost" for the last couple minutes of your trip (in other words don't push to the engine to the point that you start pushing high boost again) to help start the cool down process. After driving a few miles it gets quieter until it stops. It is more of a whining grumble as oppose to a high pitched squeel and the best i can describe it is what a car sounds like when reversed at high speeds. I have recently noticed that my mini cooper has been making a noise that sounds kind of like a vacuum after the car is off. I Pulled the fan off and started the truck and it was still making the noise. When flipping the throttle by hand and listening from the boot aperture it seems to be coming from the inlet manifold area but i haven't had the engine cover off and had a good investigation. is it the turbo winding down or cooling down. It seems like it is coming from the area of the fuel filter/accumulator. After about only 20 hours running time I noticed a whirring and grinding noise from the engine, but only at idle. Why does engine continue to make whirring noise after it is shut off? The car has an electric cooling fan that is temperature controlled. 000 km's on it. Apply throttle and the sound gets quieter, speed up and the sound goes all together. What else could be causing the noise? A: There are many potential causes for a noise of this type. After my T6 3. all AWD cars regardless of manufacturer produce some normal gear whine. Well after replacing it, the noise was still there. anyone help, one of my A2s has a humming noise all the time. This is pretty difficult to diagnose based on your description. Its in great shape, however, the previous owner disclosed to me that there was the humming sound that came on after the key switch was shut off. So ever since my last oil change, I've noticed this sort of grinding/whirring noise coming from the front. In addition to the reasons mentioned above, there would be numerous other possible causes for whining noise when you speed up your car. What the heck is/was. The service light also came on today even though it's just had one. CARspec has been seeing increased complaints of whining noises from GX470 and V8-powered 4Runner owners, specifically from the engine. been just too busy to get onto the computer these days. In normal operation it will indeed make noise, although you might have a hard time hearing it over other engine noise. Even after topping off the power steering and attempting to be sure that there was no air in the line (by turning the steering wheel back and forth with the engine off) I still get this whining noise. So if it was the bearings, wouldn't it be a big problem by now? Anyway, ive been convinced it was the sound of the wimpy exhaust for a small 4, but the sound remains even if i put it in neutral. You may have to register before you can post: click the register link above to proceed. I left but couldn't take the noise and it was hard for me to believe that this was normal in a car like the challenger. Now it won't even start! The sound was like a belt or something at the front of the engine. Any insight?. The whirring/whistling noise has returned, coming from engine. I can't recall if I only hear it after the headlight were on. In the Malibu, OBDII P0420 is often caused by a bad oxygen sensor, but there can be other causes as well. I remember a similar noise with an audi 80 I had years ago, and that was the fuel pump, which was under the car near the fuel tank, but this is coming from the engine bay area. She also said that on her way home the engine died at one time, but she was able to restart it without problems. This humming, droning, throbbing sound may precede, accompany, or follow an escalation of other anxiety sensations and symptoms, or occur by itself. It’s the sound of automotive health. I restarted the car, turned off again. Similar to Alfie's answer above, Our 2016 Highlander was making a similar noise from under the rear passenger side and I found this on page 8 of the owner's manual: "Noise from under vehicle after turning off the engine" "Approximately five hours after the engine is turned off, you may hear sound coming from under the vehicle for several minutes. After driving the car for 5 miles we left it in the garage, ignition off, left the key inside of the car. when Austin Frase heard some noise coming from around. It has 30000miles on the clock and the following items were replaced - oil change, fuel filter, spark plugs and brake fluid. If your car makes noise when accelerating or turning, don't ignore it. You are likely just hearing the cooling fans, as the vehicle will need to run them after the engine is off at times. 6 SE 4x4 Estate, manual diesel. The 2013 Honda Accord has 2 problems reported for whining noise from engine after being shut off. When I cut off the air. Try to listen for the noise with the hood up to see exactly which part it is coming from. Infact it lasts only for the first 10-15 minutes, after that the car's noise and vibration seems to go back to normal. The sound will last for at least 10 seconds. I turned off the AC/fans, the noise is still there. If the Clutch is engaged, and the vehicle coasts; there is no noise. Engine noise in the vehicles stereo speakers. It almost sounds like it's coming from the back of the engine or perhaps inside the engine. Brand New Camry motor noise from truck area of car parked in garage for 8+ hrs 12 Answers. An engine will often sound noisy on start-up because components aren't under load, the engine is cold and the oil hasn't warmed up and started circulating freely. If you just leave the key in the on position, but don't start the engine, it should shut off when it reaches the proper pressure. This noise is only when moving and gets louder and changes pitch, the faster the car is going. In the past couple of weeks I've started to hear this humming like noise coming from the front of the engine, near the pulley area, specifically near the Alternator and Power Steering Pump. The manual describes the A/C blower activating at some 50 odd mins after engined turned off. The crank bearings had no up and down play. Got under the bed (vacinity of the rear axle) and something "motor like" was definitely making a humming noise. No noise or problems. I also see some water and oil in the bilge after 20 minute runs up and down the lake. Has anyone ever experienced lower engine noise after an oil change? We changed the oil in my kids 1995 Cherokee with 200k on it and used Mobil1 EP 5w30 and Mobil1 oil filter, he has a vertical filter and we filled it up before installing to prevent dry start. 9 and he had this turbo sound coming from his truck. A buzzing noise from the compressor when the air-conditioning clutch is engaged is a sign of an overcharged system. I have 2006 Toyota Rav4, 4 Cyl, 4WD, Limited with only 57,200 miles. This thermos-type container stores three liters of coolant at close to boiling temperature for up to three days. It’s impossible to say for sure without looking at your specific car audio setup, but your audio system may be suffering from a classic ground loop problem. No check engine lights and the car runs fine. My first thought was the AIP activating per the ECM update which was completed a couple of weeks ago. Humming noises can indicate the starting capacitor is starting to fail or a bad motor. When I cut off the air. Well the sound was the air whistling through his ripped air filter. Still buzzing after about 5 minutes. In addition to the reasons mentioned above, there would be numerous other possible causes for whining noise when you speed up your car. Average failure mileage is 2,450 miles. If you just leave the key in the on position, but don't start the engine, it should shut off when it reaches the proper pressure. There are a few additives for the transmission you can find at your auto parts store for noises and hard shifts, Lucas and Wynns makes one. It synchs with the RPM's, getting louder as they rise. This page is meant to help you troubleshoot the Chevy Malibu P0420 trouble code. Preventive maintenance will decrease the chance of you ever saying "my car makes noise". They want to recreate the problem. It sounds just like a power steering pump going out, but the noise does not change when the wheel is turned. This may not be your problem, but it is easy to check. It also 'seems' to only happen when the steeering wheel is central if I am going left or right I cant hear it, the car is a ford focus 2001 with 109000 so yes its old. Why is a BMW making noise when I shut the engine off? Though this may tell you what that little electric whirring sound is that your BMW is making after you shut down the car, I don't have the. This is a very noisy condition, but usually not an expensive fix. All accessories off, idle for 10 minutes after fan comes on. Just pop your hood and see if the fan is turning. 8t last night. When cruising along around 30-40mph, and then you hit the accelerator, I notice a faint, but audible whining or whistling noise coming from the car. Two days ago I had to work the starter for a few minutes to get the car started, which I think was due to moving the car a few feet two days prior and then stopping the engine. If your car makes noise when accelerating or turning, don't ignore it. What is the whirring noise after the engine is switched off? Post by mekondelta » Tue Dec 21, 2010 5:18 pm On my 118i, when I switch the engine off but stay in the car for a minute or so, I'll hear a mechanical whirring noise as if something is shutting/closing. but when the noise returns it's much louder to the point. Comming from the back of the engine on the passenger side i can hear what sounds like a compressor noise running for approx 3 or 4 seconds after turning off the engine. The moment I do anything (close a door, insert key) to activate the car/electronics it goes away. Hi, My 07 caliber has a whining noise. Sorry can't help, although I can confirm that my 57 plate PD170 vRS also hums for around 30 seconds after switching off the engine/ignition. Ford F-150/F-250: Why is My Truck Whining? Driving your truck recently has been irritating thanks to that incessant whine. fuel pump going bad if you hear humming noise? hello after searching the forums, seems there's a general consensus that if your fuel pump starts making a loud humming noise, that it's on its way to failure and should be replaced. after the engine is turned off. The noise sounds like its coming from the transmission bell housing. I've been too lazy to pop the hood and check it out. You are likely just hearing the cooling fans, as the vehicle will need to run them after the engine is off at times. It is there up to at least 60kph when it is drowned out by road noise. 2013 Outback 2. It should come on as soon as you turn on the ignition. The 2013 Honda Accord has 2 problems reported for whining noise from engine after being shut off. 9 I have a whining noise coming from the area behind the alternator on the driver side of the engine. It had gottan soggy from a mudding episode I assume,and the paper was all ripped. Sound design accent with whirring and rotating robotic tone. Ok so here is more info after driving it today. If the noise goes away, then it may be the engine or clutch assembly that is causing the problem. Just traded in my 2010 Off Road for a 2013 Baja and it made the same noise. all AWD cars regardless of manufacturer produce some normal gear whine. Sit in the vehicle with the engine idling and the shifter in park or neutral. Braking and shifting into neutral do nothing to change the sound and decelerating. fuel pump going bad if you hear humming noise? hello after searching the forums, seems there's a general consensus that if your fuel pump starts making a loud humming noise, that it's on its way to failure and should be replaced. as in if you had sat TIBs buses. The noise I'm referring to is a purring noise immediately after turning the engine off and one that comes from behind the radio facia. This is a very noisy condition, but usually not an expensive fix. High pitch humming sound and burnt smell - posted in Maintenance & Repairs: need help. There is also another noise (sounds like plastic gears engaging) which is the main HVAC flap closing. If the pump is on all the time, then it's a problem for. Comming from the back of the engine on the passenger side i can hear what sounds like a compressor noise running for approx 3 or 4 seconds after turning off the engine. Just pop your hood and see if the fan is turning. What the heck is/was. Its not the fan (car barely up to temp most of the time). Humming noises can indicate the starting capacitor is starting to fail or a bad motor. Approximately five hours after the engine is turned off, you may hear sound coming from under the vehicle for several minutes. Q car year: 1996 car model: Z3 1. Change in RPM of the engine effects change in the sound you hear. Their noise is of a lower pitch than a turbo whine so maybe that might help to identify. When the filter plugs up the transmission pump scavenges fluid causing the whirring noise. Ok so the car makes this wierd humming noise after i turn off the engine and it keeps on making the noise. Yes that is correct. I’m looking for some help in diagnosing an issue with my 2007 pilot. After driving around and turning engine off, 3 or 4 seconds later I hear a whirring noise coming from the engine bay lasting a few seconds. It sounds like a fuel pump or something. One thing I have noticed which seems odd is that there is a whirring noise which sounds like a small fan comes on everytime I stop the engine after a drive, this happens when the key is taken out of the ignition. I hear 2 or 3 clicks and then it stops. Now it’s making this weird whining sound like a vibration. "After driving some distance and turning off the engine, the sound of a valve opening and closing can be heard at the rear of the right side of the vehicle, however this does not indicate an abnormality. The motor was perfect when new, it was very quiet and ran great. Naturally, this is after running the system for a while on a hot summer day. She also said that on her way home the engine died at one time, but she was able to restart it without problems. This is very annoying and sometimes embarrassing. No check engine lights and the car runs fine. The similar humming noise also comes continuously when engine is idling and if you happen to stand very close to the front driver or passenger door, somehow I hear it's. Remember that diagnosis of engine noises is nothing more than splitting possibilities down to only one First off, eliminate all of the accessories like the alternator, power steering pump, A. It also does a self-test when the starboard engine is started, so you'll hear it then as well. all AWD cars regardless of manufacturer produce some normal gear whine. There are various situations which can create power steering noise. Use a length of vacuum line with one end in your ear and probe the other end around looking for the source of the noise. When you accelerate and hear a squeal, a squeak, or a whine, odds are the cause is a worn belt. I sounded like the power sterling pump, so I replaced that, but noise continues. Ford Focus owners have reported 17 problems related to engine rattling and whining sounds (under the engine and engine cooling category). The 2013 Honda Accord has 2 problems reported for whining noise from engine after being shut off. To check the pumps individually, you can pull out the in-tank fuel pump fuse after you do the above test, and repeat the test. • The noise should increase in frequency with engine speed (RPM). 2: Find a secluded road that you can get up to the 40-50 MPH range (70-80 KPH) and serpentine left and right. If a whining noise from your car stereo has you covering your ears, a ground loop may be to blame. This goes away after driving off. It also 'seems' to only happen when the steeering wheel is central if I am going left or right I cant hear it, the car is a ford focus 2001 with 109000 so yes its old. So if it was the bearings, wouldn't it be a big problem by now? Anyway, ive been convinced it was the sound of the wimpy exhaust for a small 4, but the sound remains even if i put it in neutral. You hear a whistling noise coming from under the hood: Check the hoses for vacuum leaks. An engine will often sound noisy on start-up because components aren't under load, the engine is cold and the oil hasn't warmed up and started circulating freely. A couple of the other main causes that would lead to whining noise when accelerating would be:. Two days ago I had to work the starter for a few minutes to get the car started, which I think was due to moving the car a few feet two days prior and then stopping the engine. Humming definition, making a droning sound; buzzing. I did a power steering fluid flush just in case. Last fall the jeep would intermitantly whine like a car trying to go fast in reverse. When I turn the steering wheel, I also hear a hissing noise and the engine speed increases a little. If a car starts to make a low drone sound, much like the sound of someone blowing across the top of a soda pop bottle, this could be a sign of the motor mounts or exhaust system being worn out. My first thought was the AIP activating per the ECM update which was completed a couple of weeks ago. The coolant temperature seems to run normally at the middle of the temperature gauge. It makes a whining/growling noise most noticeable when I let off the gas. I have a 2006 chrysler 300 limited with 3. Hi, I've a 1. I just replaced the fan clutch on my 2006 Ram 1500, because it was making a lot of noise like it was stuck on. If it is the same noise that i am thinking about i would haft to say it is your Alternator. Many times a friend or customer will ask me to come listen to a strange hissing sound when the automobile is turned off. Fixed it myself. Hi gang after owning my car for a while i have starting noticing the usual creaks and rattles etc. It rarely makes the noise when I start the engine at any other time of the day. Then you can pull the lowest. This is the sound of a fuel evaporation leakage check and it does not indicate a malfunction. It only makes this noise after it's warmed up - starts making the noise after about 15 minutes then continues whenever I press the accelerator and a steady whining noise when idling, what do you think it could be?. This noise is caused by the operation of the fuel evaporation leakage checking system and the operation is normal. Ok so here is more info after driving it today. Now, after idling a long time, I started to hear a high pitched wine. Still buzzing after about 5 minutes. I've had a humming/tire separation type noise for about 6 months when I decelerate to 30 mph. He used a battery charger to jump start the car so he could get it into the shop. ; Vehicle is a SRT8 WK or LX. Probably the most important thing you can do for your Insight: Idle Relearn! Unplug the 12v battery, Idle relearn. Suspension failures will make a low groaning noise, and a bearing failure in the engine or a flat tire are known to cause a loud roaring noise. It sounds like a fuel pump or something. Vehicle is a 2018 F-150 with the 5. It's definitely a different noise than other normal/typical noises heard after the engine is shut off. This happens once you drive the truck around for like a block(not on cold start). It had gottan soggy from a mudding episode I assume,and the paper was all ripped. The whirring will increase and decrease with the speed of the car, so it is very noticeable when driving on the highway as it can be quite loud. is this normal does yours do it. In addition to the reasons mentioned above, there would be numerous other possible causes for whining noise when you speed up your car. When the filter plugs up the transmission pump scavenges fluid causing the whirring noise. I've had my '03 XC70 since this past September and a new sound has popped up. My fathers Silverado, 2004 I think, Regular Cab 4X4 model, has an issue. The noise will stop immediately if I lock the doors but will continue for an hour if I don't lock the doors. Is that correct or is there something wrong with it?. The after-running of the cooling fans is deliberate and can sometimes last up to 16 minutes after switching the engine off. BROWSE NOW >>>. Whirring, buzz sound after vehicle turn off. Screeching noises are almost always associated with slipping engine belts. I checked the fan and had it not spinning and it still made this noise. here's a tip for you to help pinpoint engine noises, take a stick (as pehaps a humming noise engine. 5 months now. I noticed a whining sound coming from my car after a long drive and searched for the cause and it seems to be coming from the alternator and the whining sound is heard after the car is turned off and while it is on. During my XC70 tour about Sweden/Norway after pickup from Goteborg/FDC I noticed that after switching the engine off there was this whirring/buzzing sound coming from behind the HU-803 unit. Noise after engine shutoff. Speaker Noise Symptoms. I happen to have the same experience as you when sitting in my 1998 Honda Accord after it has been shut off. I could've sworn when I first heard the sound after engine shutdown, it was like a humming (or slightly buzzing) sound. This noise is caused by the operation of the fuel evaporation leakage checking system and the operation is normal. fuel pump going bad if you hear humming noise? hello after searching the forums, seems there's a general consensus that if your fuel pump starts making a loud humming noise, that it's on its way to failure and should be replaced. I pulled them off today an the smaller one definitely turns harder than the larger one. It is there up to at least 60kph when it is drowned out by road noise. whining noise from engine bay (with video) I'm not sure if its the cam belt, alternator belt or what, but whatever it is it doesn't sound right. What the heck is/was. For the past couple months, I have experienced issues with a humming/buzzing noise (similar to the sound of the old GM seatbelt signal, but at a much lower volume) coming from the engine (don't know exactly where), but the engine is OFF, with NO key in the ignition. Last night my wife came home and told me that the car was making some whirring/whining sound with the engine turned off and no key in the ignition. The noise from mine is a high pitch whine audible even from inside the car after you switch the ignition off and running at the same level for about 30 seconds or so. The noise is less after the car is warmed up, but I still hear it when I give it gas. It lopes up and down to the point where it will almost shut off, then the engine will correct itself and run normally for a bit. At first it sounded like the engine of a louder car driving near me so it took me a couple days to realize that it was actually my car making the noise. 4-5 days after that, at the same place as the first, although this time I have the opportunity to tap the rear then front brake, no difference, then I begin to pull in the clutch and the noise suddenly stops. In other words, the fan running when the engine is off is completely normal, right up until the point where it is no longer normal If your fan runs on for a few minutes and then shuts itself off in a reasonable amount of time, no worries. I would suggest leaving the pump alone. After turning off the engine, remove the key. Hi guys, I need your help. Why is a BMW making noise when I shut the engine off? Though this may tell you what that little electric whirring sound is that your BMW is making after you shut down the car, I don't have the. However, I hear humming/buzzing types of noise coming from the engine compartment right after the engine is turned off. If the whining sound occurs when you shift the gear to the Reverse or Forward and it goes away after moving to the Neutral mode, the torque converter must be having a problem. Have you had an experience with your HVAC system making strange noises? Tell us about it in the comments section below. Got 46k on the CTD and noticed that nearly every time I shut off the car, I get there is a humming noise that lasts for about 5-10. Possibly a secondary electric water pump. Im not sure where to go next. The moment I do anything (close a door, insert key) to activate the car/electronics it goes away. I would take it in ASAP if I were you, I had a whining and whirring noise that started a few months ago, aside from the whirring noise that is very audible at low speeds I had no other problems, but I read a few posts here on the forum and saw that some people had bad transmissions so I took my 2014 Crosstrek in last week to the dealer, and sure enough, the transmission is shot and I need a. About 2-3weeks ago I started to hear a very noticeable whining/humming noise coming out the driver side when the car is in idle or at a stop light. Download and buy high quality Whirring sound effects. From what I can tell it will continue indefinitely if I leave the key forward in the ignition. I happen to have the same experience as you when sitting in my 1998 Honda Accord after it has been shut off. What is this? It sounds. I'm getting a "whining/whirring" noise when the engine is revved. They continue to run for a while until the aquastat is satisfied even after the engine is shut off and give off a humming sound. those which were not replaced would be the ones i would look. The sound starts as soon as you give it some gas. When flipping the throttle by hand and listening from the boot aperture it seems to be coming from the inlet manifold area but i haven't had the engine cover off and had a good investigation. One thing I have noticed which seems odd is that there is a whirring noise which sounds like a small fan comes on everytime I stop the engine after a drive, this happens when the key is taken out of the ignition. The noise is soley dependant on engine revs so gets louder as revs increase, and gets quieter as they decrease. 5 Sounds that Signal your Car Needs Auto Repairs. If it is , you now know the noise is being produced from one of those accessories. It is more of a whining grumble as oppose to a high pitched squeel and the best i can describe it is what a car sounds like when reversed at high speeds. I hear a loud fan whirring away inside the bonnet. Reader Question My 2004 Toyota Prius makes a loud screaming noise from the engine compartment after shut off for 5-30 seconds (about 50-70% of the time) and sometimes after starting for 5-10 seconds (about 3% of the time). • The noise should increase in frequency with engine speed (RPM). I have had it off-road including some pretty serious mudding back in early March where I got stuck for a little bit (because of the soft mud, not engine related) and it's entirely possible I have crap in there. This is the sound of a fuel evaporation leakage check and it does not indicate a malfunction. If you are trying to reduce the furnace noise, you can cut down on the sound coming off of it by insulating the furnace room walls with rock wool. I have noticed this the past few weeks with my new Civic. I sounded like the power sterling pump, so I replaced that, but noise continues. This condition only happens to cars with carburetors.