Prius (2010-12) :: Loud Clattering Noise From Under The Hood Occurred Upon Startup
Sep 8, 2010
Twice during the 6 months that we have owned our 2010 Prius, a loud clattering noise from under the hood occurred upon startup. After shutting it down and restarting, all was normal. It sounded like an engine that was getting ready to throw a connecting rod. The dealer could find nothing wrong and when I contacted Toyota's hot line, they were clueless as well. One service writer suggested the ABS as the source, but I've owned 5 other cars with ABS and never heard anything like it.
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I have a 2012 Elantra with 25k miles and after the car sits for about 2 hours, there is a loud clattering noise coming from the exhaust when running. Mainly when I first start it up and take off down the road. After about 2 mins of driving, it's a lot quieter.
Anyways, I raised it up a bit today and everything looks normal, but using a mallet, I knocked all over the exhaust a bit and it all seems to make a rattle noise. Mine started about 1 month ago.
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Since new my Prius V has had a metallic clattering sound that comes from underneath the car. This can be replicated when driving over lane divider dots on a quiet street with the windows down. To investigate, I put the car on ramps and looked around; I was almost certain the sound was coming from a thin aluminum heat shield that is just behind the engine. Tapping this shield made a similar sound to what I heard coming from under the car while driving over bumps and such. The shield is poorly attached with those "fun" push pin fasteners that seem to be liberally deployed all over the undercarriage. I decided to re-attach the shield with a judicious circular application of silicone under each of the holes in the shield and let it dry. The clattering sound I heard previously when tapping the shield was gone. Out for a test drive and still there!
I just had the first service done, and of course the tech couldn't hear it on his test drive. Unfortunately I was pressed for time, so I wasn't able to take a test drive with the tech. I will drive the tech around next time and demonstrate it.
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When I start my car I hear this very loud noise. I think it is coming from the exhaust but not sure. This only happens when the car is cold(not weather) and after a few minutes the noise is gone. I have aftermarket lowering springs on the car, do you think that caused the problem?(I'm thinking no)...
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I have driven 25,xxx miles on my 2010 Prius. Three times during the last thousand miles I have experienced very loud and scary engine noises during start up. The car had sat for at least ten hours outside in 20-30 degree weather.
I took the car into the dealership for an oil change and my service advisor told me that Toyota was aware of the problem and the noise was not coming from the engine- but a device that mates the ICE with the electric engine. He told me that although it was a loud and dangerous sounding noise, it was not something that would harm my motor. I asked that the noise be logged into my service record.
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I have a 2002 Prius that is running fine except for a loud noise when I started it up---like the one the exha fan in my bathroom makes, but the car runs well and there are no lights or any other indicator that anything is wrong. I am taking it to a local mechanic today, since I don't trust my local dealer. My car has about 95, 000 miles on it.
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Yesterday my 2008 Prius with 95,000+ developed a new noise after turning it off and it has me a bit worried. I took an audio sample? Last night it occurred for like 5-10 minutes. Now today I went to turn it on and before I even pressed the power button it made another noise that I've never heard before which I didn't get on audio. It turned on fine, I let it run for a few minutes and then shut it off and the noise I got on audio occurred for several minutes. The noise comes from the driver's side by the electric motor. The clip should play in iTunes or Winamp, took it on my iPhone so its kind of low in volume.
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Have a "06 Solara V6, 82K conv. and it's started making a swishing sound under the hood especially upon startup. Sounds like a belt may be rubbing.
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I noticed my car hiss and hum from under the hook after shut down, for a few minutes. What is it doing?
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Yesterday morning, my 2010 had a very strange noise happen at startup. I'll preface this by saying that it was very early in the morning and I wasn't quite 100% awake, so the exact chain of events are a little foggy to me.
It was about 65 degrees when I went to start the vehicle in the morning. I noticed it was pretty humid out and the first humid morning of the year (I live in central PA). When I hit the power button, a very loud noise came from the engine area. It sounded like metal grinding and the motor having difficulty idling. I depressed the brake to attempt to put the vehicle in drive and the yellow "!" indicator light came on with a message on the on board display (i cant remember what it said). I shut the vehicle down and after a few seconds hit the button again..... same thing. This time, the idling and "grinding-like" noise went away and then the car seemed 100% normal. I noticed there was a little bit of blue smoke coming out of the exhaust while it was idling/grinding roughly.
Perhaps not the smartest thing to do, but I left for work and the vehicle has worked 100% fine since the mishap yesterday morning. In total, I have driven about 150 miles since the issue with no problems.
I read a sticky post concerning a service bulletin for engine knocking at start-up but what i heard seemed to be more than knocking and it was well above 40 degrees.
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My 2010 Prius V just past the 24000km mark. I have a buzzing noise coming from the engine bay during startup. It happens when the interior fan is on. You can hear it clearly after you start the car, during the silence of the "boot up", before the ICE kicks in. I can't be sure if it continues to buzz after that because the sound of the ICE drowns it out. However, If I shut off the fan during the boot up, the buzz disappears. Finally, if I leave the fan off and start the car, there is no buzz.
During a recent oil change, a hybrid technician claims that this is normal. It used to happen infrequently but now it is consistent, so if it was normal, I should have heard it when the car was new.
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I have a 2009 Gen III T Spirit. Recently, and I think following the recent reflash, I have been getting an extra noise on cold startup. It is a scratching noise that lasts just a couple of seconds about 4 or 5 seconds after pressing the start button. I have tried to attach a short recording but cannot upload an mp3 file so have made it into a zip file.
I have checked whether it is radio by removing fuses 8 and 28 and have also switched off the heater fan, both without any effect.
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it was warmer the day than it usually was so it dosnt make the noise as bad however there is usually a lot of clatter/knock from the engine when cold. does it at idle and while accelerating. it gets less once the engine warms up but has been doing it for a while. car has 93k miles and synthetic oil is used. there is also a metal rattle sound almost like a heat shield that is loose. idk if that is part of the engine issue or not. but it only happens in winter or when temps fall below 60 degrees. kinda hard to hear on the vid but its there.
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I just bought a 2012 Hyundai Elantra GLS (Canadian model) with 44k km. When I first test drove the car, the dealer (Honda) had the car warmed up and ready to go. As a result, I didn't notice the loud engine or anything. All I noticed is the engine was louder on acceleration versus my 2008 accord. I already bought the car but today I asked to test drive the car again (I'm excited) and noticed a loud ticking on startup? I asked the Honda dealer what was wrong and they simply said Hyundais are louder than Hondas. My 2008 accord has a ticking engine already but Honda is rebuilding the engine. This car is ticking louder than my 2008 accord. However, the car does quiet down when the engine is warm.
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My girlfriend and I just bought a 2011 a few weeks ago. We test drove it a couple times ourselves, and had our mechanic take a look at it and drive it also. Everything looked and sounded good. Not sure how much it matters, but it's a Certified Used as well.
A couple days ago, returning from a 45-minute drive which included some short stretches of gravel road, I noticed an oscillating sound. It's definitely not a noise that was there when we bought the car. Unfortunately, my cell is apparently bad at capturing audio, so hopefully my description will be enough.
The noise is very faint, almost inaudible, at low speeds. Between 30 and 35 mph it gets much louder, peaking at about 33. There's some vibration through the accelerator pedal also. Above 35, it fades pretty quickly and I can't really hear it at 50. The sound itself is 3 beats on, 1 beat off, about every second. There's a slight difference in pitch between each beat.
If that isn't enough to go on, let me know and I'll give the recording another shot and upload it if the noise is audible.
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I have a 2013 Prius with 41K Miles. When I turn on the car I can hear the Air Conditioner Fan (my opinion) a bit louder than normal. I know it's the A/C Fan because when I turn off the A/C the sound goes away. It makes a weird Zoom sound, but louder than my previous cars and my wife's car.
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2.7L V6 here. It's got a loud ticking noise under the hood that sounds like it is coming from about the middle of the head closest to the front. It's been doing this for a long time now and is finally bugging me. The noise is related to RPMs meaning that as you rev the motor it gets faster (but not really louder). When I pulled the valve cover about a year ago both heads had lots of gunked up old burned oil which I cleaned up as much as possible. It doesn't throw any codes and runs just fine.
I'm about 99.9% sure I've got a collapsed lash adjuster(s). Is there a way to test it without pulling it? Can I pull the valve cover and have someone turn the engine over a few times to check for oil pumping from the lash adjusters? Is there a way to press it and see if it moves without pulling the cams? Any options to try and clean them while still in the motor?
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I was driving today at maybe 55mph on the highway my car has 82,000 miles and I started to hear a loud jackhammer like noise come from under my hood I pulled over and popped my hood I didn't really see anything mind you I'm no mechanic but I was able to make it home but when I accelerated it got louder, what could be causing this problem? It is a 2006 Ford Mustang 4.0l v6....
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The wife came home with a really loud screaming noise coming out from under the hood. I used my stethoscope and I'm 95% sure it's the alternator. It was a pretty easy removal process, sending it out to be rebuilt tomorrow. I guess at 90k I have no reason to complain.
I chose to get it rebuilt because of info that I had heard true or not, that Toyota alternators have an internal clutch and aftermarkets may not work properly.
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My 2003 Mustang convertible (6cyl) has recently started making a loud clicking noise under the hood that seems to come on after driving in stop-and-go traffic or when turning on the a/c. I don't notice it when driving on the highway at a relatively steady speed. The clicking will continue for a minute or so and then stop for a while. I had also noticed a strange melting plastic or chemical smell coming from under the hood whenever clicking has happened. I had also noticed a couple weeks ago that at stop lights, the a/c was blowing warm air even when on the coldest setting. The air would then become cold again after driving for about a minute. What could this problem (or problems) be and can I fix it (or them) myself?
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I have a 2000 VW Passat 1.8T Automatic. During a cold start, I notice a rather loud noise like a motor whirring that lasts for approximately 30 seconds. My RPMs also run about 200 higher than idle during this time. After the 30 secs the noise goes away (sounds like this motor powers down) and the RPMs return to normal.
It doesn't happen every time I start the car, just when it has been sitting for more than 4-5 hours or overnight. What this is and what if anything I should do?
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