Prius (2004-09) :: Booming Resonating Noise In Cabin At Idle And Low RPMs
Oct 13, 2014
I own a 2007 Prius Touring w/120kish miles. We are currently experiencing a huge booming resonance at idle and low RPMs. The noise isn't subtle, almost sounds like we're in a Huey with the doors open. Here's what I believe I know:
- No DTC's are being thrown
- ICE seems as smooth as ever
- No apparent changes in fuel economy
- Plugs were replaced 40k ago and coil ignitors are original--not running rough or missing though
- Visual inspection of exhaust shows no leaks or contact with body
- Motor mounts pass the test I looked up [in drive/reverse, depress brake, watch unusual engine displacement]
- Noise is not vehicle speed related, only engine speed coupled--probably between 1K and 1.8k rpm
I'm sure I'm leaving something out but aside from messing with the coils or plugs I've looked at everything I can think of. I haven;t gone to the dealer yet. Lot's of reading searching have only revealed CV issues.
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I installed a CAI (CTS Motorsports) and I'm hearing some sort of resonating humming while driving. I also installed a 3'' turbo back exhaust (SPM) and did APR stage 2 tuning. I did not do everything at once, the CAI was installed 3 weeks prior to any other install on my car. I've been hearing that annoying hum ever since I installed the CAI. The humming doesn't happen when drive normally, shift and slowly increase the throttle, but when I stomp on the gas I hear it every gear shift around 3000 to 5000 rpm. When I mash on the gas and shift, it hums only for a short period of time until i shift again. I don't think its a high speed hum issue. I can easily do 120 and not hear a thing, but when i rev at high rpm's I hear that resonating hum.
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I have a 97 3.5. A few years ago something in the drive train started vibrating/resonating strongly when the engine RPM's reach about 1800-2000. I can feel it most in the gas pedal but it also resonates through the dashboard and sometimes makes the dash cover buzz. It didn't start out faint and get progressively worse, just started one day and has been there ever since and hasn't really gotten worse. Actually started after replacing my plugs, wires, intake gaskets, and valve cover gaskets. I originally thought engine, then I thought maybe it's in tranny, but it's worse when a/c is on although compressor is quiet and works great.
More info: has 198k, runs like a champ, no hesitation; tranny replaced @ 104K
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Lately, I have noticed a subtle booming noise that is occurring from 40 to about 55mph. It is almost a shudder but is only speed dependent and not related to rpms (happens in all gears).
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I'm trying to figure out what is wrong with my Prius. A few weeks ago, there was a big rainstorm in California, and I accidentally backed into what I think was a storm drain under very deep water. I heard a big thunk, but there was no visible damage to the car. A few days later, I noticed a low groaning noise that comes from inside the cabin, somewhere around the center console/front passenger side. I usually only hear it when I am moving at low/moderate speeds and turning the wheel to the left, although occasionally if the road is bumpy I hear it with my wheels straight ahead. For a couple weeks, I thought the noise only happened when moving-- however, last Friday, I was sitting in the car, which was parked on a hill with the wheels curbed (steering wheel all the way to the left). I turned the car on, and immediately the car started groaning (even though the car was in park). Then, after about 30 seconds, the gas engine turned off (I think that's what happens when the car gets much quieter after idling for a bit) and the noise stopped. SO, it happened when the car was in park as well.
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I recently turned on my AC and heard a "flapping" noise from the cabin air circulating fan blade. After a minute or so, noise gradually subsided. Two days later, I turned on the AC and a smell most foul filled the cabin. Being a farm boy, I know the odor of ripe dead animal and I'm guessing a mouse. Is there any reasonable way to gain access to the area where the fan is so I can attempt a clean-up?
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My girlfriend has a 2008 with around 120k miles on it. It's been pretty flawless but yesterday the RPMs started surging while idle and made kind of a high pitch humming noise when accelerating.
Today on her way to work she said the radio was going in and out, the battery light lit up and then the rest of the dash lights came on, and the speedometer stopped working.
What could be the problem? Could it just be the battery?
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B6 manual, after 20k miles with Dunlop Sport Maxx 235-40-18 tires (still pleny of tread left, even on fronts) a moderately loud humming noise has developed, loudest at 35 mph but even heard at 10mph, with an irritating resonance of subwoofer-type. Noise changes somewhat with road surface, but not much. Not related to engine speed, gearbox, or radio. My next step will be to swap wheels.
For now, any thoughts as to the cause?
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I test drove 2 2005 escape limited v6 2wd today. Both of them were pretty loud in the cabin at idle. The noise and vibration did lessen after the car started to move. Is this normal for escapes or does this indicate a problem somewhere? Like engine or transmission mounts.
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When I'm going up hill or any time I'm at high RPM's, a flicking (not clicking) noise starts. Additional revving of engine. At first, I thought it was the AC blower motor. It's def not that though.
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I recently bought a 2004 Hyundai santa fe 2.4l with 94k miles. when sitting at a idle it has a slight vibration in the cabin, feels like a slightly rough idle, when you drive the vibration is gone. I also had it throw misfire codes for cyl 2 and 4. I put in new plugs and changed the wires, coils are on the way. When the car is in drive and I put the parking brake on and walk up to the motor it sounds like it has a exhaust manifold leak, but I only hear it when in drive. I guess my question is, could this exhaust leak be causing the rough idle or will this be fixed once the new coils are on?
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Was wondering if take out the carpet and added dyno mat or fat mat yet. Does this make a big difference in road noise? Or very little? My C2 seems pretty loud on the freeway.
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I have the "mouse in the cabin air filter" problem. Where exactly is the entry point outside the firewall where fresh air is brought in?
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My car is making this noise. Its only at idle. Doesn't affect fuel economy, just alarming.
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After replacing the cabin air filter I heard a loud noise from the fan area in the car. I rechecked the installation which was ok. I then reached down into the fan assembly, and there was the problem, some leaves had fallen into the fan when I removed the old filter. Took out the leaves , and all is well.
I replaced the OEM filter with a Fram Fresh Breeze filter which interesting enough only had half as many folds. I figure a big company like Fram must know what they are doing?
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I am a fairly new 2013 Prius C (Four) owner and I was wondering about cabin noise, specifically plastic clicking and popping. My questions is about, plastic clicking and popping sounds coming from the dash area?
It's hard to pinpoint exactly where but most of the sounds comes from the far left and right corners, close to the window vents where the windshield meets the dash. I do also notice some noise around the middle of the dash as well. This occurs on any type of road condition but is of course aggravated with rougher road surfaces. I don't believe it to be a small piece of plastic bouncing around but more of loose panels or something of that nature but I'm not sure.
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I just changed my alternator because it was making a whining sound off/on, then just went completely dead. I got it back from the shop and that certainly fixed the problem. However, I now notice a very faint high pitch ringing from idle to 2.5k rpms or so, I hear it more so in the cabin. Also, if I hold at 1,500 rpms now the engine vibrates and stumbles right at that holding point, it didn't do that before. Is there a chance that this remanufactured alternator could be the problem?
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I have a 100% stock 2004 Celica GT ~125,000 miles. Over the last few months I have been getting a rough idle and stumble at low rpms. The other day the car would not restart after sitting for about 20 minutes. Only recently has it actually thrown a DTC. The error codes were for misfires (P0300, P0301,P0302,P0303, P0304). I don’t get a code every time but the problem seems to be more noticeable if the car has been ran for a while, sits for 20-30 minutes while in a store and then when I try to start it when I come out of the store is when the problem most often occurs. When it restarts it will stumble at low RPM and if I hit the gas it has little response and misses badly. I have never used a scanner until now. I am using a Autel MS509 scanner and I am not sure it is giving me the correct diagnostic numbers for the live data. I think the DTC are correct but the live data is questionable.
Here is what I have done so far.
- Cleaned IAC valve (completely removed and cleaned)
- Searched for vacuum leaks using carb cleaner
- Cleaned MAF sensor
- Replaced all 4 injectors
- Replaced upstream and downstream O2 sensors
- Replaced Coolant Temp Sensor
- Ensured cam tensioner is providing adequate pressure to the cam chain
- Tried 2 sets of new Iridium NGK plugs and a new set of Bosch Copper plugs
- Moved coil packs around
- New air filter
- New fuel filter
- SeaFoam through intake and gas tank. I have not mixed in the oil.
- Compression Test (1=190,2=190,3=160,4=178)
Things I have not done.
- Taken it to the stealership
- Fuel pressure test
- Valve Clearance
I am concerned about the compression test because according to the service manual it should be around 218. I was using a Harbor Freight compression tester and I am not 100% sure I had a good seal with the tester.
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My mother has a '04 Santa Fe 3.5. Her automobile makes a rattling/grinding sound when around 1000rpms/idle. However, the sound disappears when accelerating and drives like a charm. The sound returns once again around 1000rmps at idle or stop. I have changed the oil pan, replaced oil and filter and even put in a new battery. I'm not an aficionado when it comes to Hyundais (Subaru driver here).Car also has 180k miles.
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I have a 2008 Prius, and the cabin fans will not turn on. I've tried fiddling around with all the AC settings and fan speeds, but I can't get to fans to work at all.
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My 2007 Prius has stopped producing cabin heat; the blower fan is working. I have no dash warning indicators. I am in an area where the are no Toyota dealers and need to drive 160 miles to home and shop. It has just turned cold. Why and if I am ok to drive to the shop?
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