Prius (2010-12) :: Loud Noise When The Engine First Started Up
Mar 7, 2015
Twice in the last month, my 2010 Prius has made this incredibly loud noise when the engine first started up. The noise continues for a minute or two, and then stops. The car then runs as normal. I brought the car to my dealer, who after a brief looking-over could find no reason for it. I shot a video of the car making the sound the 2nd time it happened and brought it to the dealership with me to play for the mechanic. No one who heard it there ever heard anything like it before.
It has been really cold here this winter, so "cold oil" was once thought, but was dismissed as unlikely. The car gets 0-20 oil.
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We're having problem with our Prius where car suddenly started to make weird clunking noise from the engine (28k miles, 2011 Prius). Car sounds unsafe to drive around, so I left it parked in the drive way. I did check engine oil level and it was at F level.
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When the battery power is low, the engine will kick in and then there is a loud "exhaust" sound. Are those really sound from the exhaust or some other fan?
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So my 2012 plugin was parked for about 3 days, and when I turned it on, heard loud knocking and the check engine light came and stayed on.
When switching the car on or off, I'll hear two taps/ticks that were not there before. Loud knocking is not there now.
What can the issue be? It was very cold and snowing.
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I got in the car today and started it... I was waiting a few seconds for someone to get in the car (it was in the garage) and as soon as the engine kicked on there was a very very large long rattle noise i immediately turned the car off. Waited again and turned it on same noise.. the only thing I found was a cover under the car towards the front was really loose. ( I haven't hit bottom or anything while driving) but I did have the lighted door sills just installed the other day. But it never made that noise..
btw i have 1100 miles on it..I looked under it and is the black dust protector thing supposed to be loose like if I push on it I can make it rattle..
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For the past few months I've been hearing a loud fan-like buzzing noise coming from the passenger side of the front of the car. I don't know that much about cars, but it almost sounds like the engine is racing or something is spinning too fast. It has gotten increasingly worse, and seems especially loud at high speeds on the highway.
It is not the heating/cooling fan - the noise is present when the heating/cooling system is turned off.
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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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Our 2010 Prius was stored for the winter with a battery maintainer on the 12 volt battery. When the car was started, the engine fired up but made a terrible racket as it stumbled and vibrated, flexing the motor mounts. Within a few seconds it was smooth and quiet.
The drive battery charge monitor looked as the same as when I parked the car (two lines from the top).
The next couple times the engine was started, it stumbled for a second or so, but now is smooth and quiet as usual.
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My car has 63 000 km and engine is making loud knocking noise all the time. Dealer took a quick look and he asked head office. Now he wants to run some tests to see which valve is bad. He's hesitating between repairing or replacing the engine. I'm really disappointed of Hyundai quality. I really hope that I get new engine instead of poor repair job.
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I recently bought a 2011 Prius two from an independent car sales shop. After 2k miles, I thought I'll replace with Mobil 1 synthetic. I'm doing the oil change for the first time and made a rookie mistake. Car on ramps, assuming the car was turned off (in fact, it wasn't), I removed the drain bolt and filter.
Oil was almost drained and suddenly the engine turned on. I scurried over and turned it off, probably in 6 or 7 seconds. Car runs fine now. But, I just want to know what damage my silliness would have caused the engine.
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2010 with 61000 kilometers.
Yesterday morning it was a rainy and damp weather around 3-4 degrees Celsius when I started my Prius. Usually I start it up, get out and have a cigarette or something before driving so that the ICE has a minute or two to warm up. Immediately after the ICE fired up I heard a very loud clanking and vibrating sound. I immediately shut the car down, checked all fluid levels and read the codes. No codes, no warning lights. Fired it up again, same thing. This time I opened the hood and went to see what's going on. The ICE made this noise and vibrated like hell. After a few second though the clanking and vibrating slowly went away and it started to sound normal again.
Scared the living crap out of me! This hasn't happen before or since. I had like 2-3 40km drive cycles after that on the same day with no problems. The day before I had to move the car just a bit, and when doing that the ICE came on just before I turned the car off. No codes, no warning lights. First thing that comes to mind was a misfire that vibrated the engine like crazy, maybe due to the damp weather effecting spark plugs or a flooded cylinder that was due to the only a few seconds of engine running the day before.
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Odd, relatively loud "whoosh" noise when they turn off the engine? It sounds pneumatic in nature, like a pump or servo of some sort sealing or depressurizing? I should note that I park in a garage, which may amplify it. Definitely more noticeable if you open the driver door or window then kill the ignition.
Second, I don't know if it's the cold, a bad batch of gas, or just normal but the motor seems to make a clack clack clack noise when stopped/at idle. It's not consistent and doesn't seem to affect drivability. I just hope it's not knock or slap, i.e., indicative of serious issues. Am I just being paranoid and overly sensitive?
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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 hear this loud grunt noise coming from engine area or brake area at random times, not all the time. I can feel the grunt, sounds bad.
1. Coming to a complete stop hard, grunt.
2. After shutting car off, stepping out of the car and 3sec later GRUNT.
3. Idling sometimes it grunts out of no where.
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I have noticed that when the car was in park today right after I started her I heard a semi loud tapping noise coming from the engine... It slowed down when I turned the wheels or played with the brakes... As I went into drive the noise went away after about 20 feet of driving..
What this could be? Is it normal... Just bought the car last week with 45K miles on it and just want to make sure if it is a normal noise or not or whether I should bring her into the dealer.
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You know the ticking noise that is normal for our engines? Well, below 25 degrees F, it is the most worst noise ever. It sounds like the valve train is going to explode. Just keep in mind I've driven many cars. The ticking noise shouldn't be outrageously loud.
But my main problem that is worrying me is this WHOMP-WHOMP-WHOMP noise. The higher the RPM the faster the noise. Doesn't matter if the car is moving or not and I know it's coming from the engine. I hope it's not related to the loud ticking. It only happens for approximately 5 minutes. After that, there's no WHOMP sound and the ticking goes back to normal sound levels.
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Our Prius is only a year old with less than 9,000 miles. Everything has been fine with it and then yesterday I took it out of the garage and started to drive and there was the most horrendous grinding/squealing/scraping noise as I started moving from the front passenger side (UK passenger, so left looking out).
I stopped the car and had a look, as at first I thought I was dragging something, but nothing to be seen. Checked the parking brake was definitely not engaged. I then thought perhaps something is caught in the brake pads and it will go in a bit, however even hard braking didn't seem to change the noise at all.
Carried on (I was going about 7 miles), and as I drove it would gradually get quieter, and then get louder again, with the occasional "clang" sound almost like a spring under tension suddenly moving.
Towards the end of the journey it had started to go quieter again, but with the window down you could still hear constant squeal/grind.
Parked the car, was away for an hour, came back and set off home and the noise was totally gone. Entirely silent all the way back home! Now I don't know what to do - whether it will come back, or whether I should take it in to garage for them to look (even though it's now not making any noise).
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Our 2010 Prius has about 57K miles on it (mostly highway and rural commuting). The rear brakes just started to make some noise the other day at low speeds. It sounds like a light metallic squeal, similar to a brake pad wear indicator. It only occurs at low speeds and in reverse. Last time I checked the pads, they had lots of life, but that was in the spring.
I'd like to take apart the brakes to service them, but I don't know if this is a DIYer job on a Pruis. I have tons of experience on auto repairs, and have done hundreds of brake jobs (I also perform auto restoration as a hobby and have done almost every type of mechanical work on a car). So I am not really worried about my skill, but I am worried about knowing the proper procedure to do the repairs on a Pruis.
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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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What is this metal on metal noise...you hear it the best around the 7-12 second mark...it is especially loud on cold start in the morning when you put the car in "drive" but don't move the car forward. It also is prevalent on hot days when you park the car outside and just start the car. The sound gets louder when you turn on the a/c during the hot day.
2010 2011 lexus engine noise metal noise - YouTube...
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