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Old October 29th, 2012, 01:48 AM   #1
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Strange Noise During Accel

V6 6 speed 150k miles, original timing belt, original clutch, CAI, rataining screws out of rotors.

For about the last week now my car has been making a weird metal vibrating noise coming from the engine bay (from what I hear driving with windows down) during acceleration in every gear from about 1500rpm to 2000rpm and then starts again at about 2500rpm to about 2900rpm. Doesn't happen with light throttle (as in barely accelerating) but happens all other times. Over the last week it has gotten louder and I haven't noticed anything when the the car is cold. I can hear it when engine braking in 4th while the revs go through the specific rpm's. I tried revving with clutch in and in neutral but couldn't hear it. I'm thinking something with the trans but really hoping not. Thought it was my intake vibrating or lugs loose but no. Any help is appreciated. Thanks guys. I can also try to get a video of the sound if needed.

Also from my experience it doesn't sound like the usual bearing noise either.
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Old November 5th, 2012, 10:32 PM   #2
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150K on original timing belt? You do realize you have to change it out at 100K...
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Old November 5th, 2012, 10:33 PM   #3
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Its called VTEC!

But really, is your clutch original? Idk what you mean by bearing noise (lots of bearings in an engine!) but could be throw-out bearing on the clutch assemby? Possibly noise from the water pump if it hasnt been replaced. Also could be your timing belt tensioner. Possible valve adjustment needed?
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Old November 9th, 2012, 01:46 AM   #4
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Originally Posted by ll Diabolic ll View Post
150K on original timing belt? You do realize you have to change it out at 100K...
I do know it needs to be changed but I don't believe that is the issue because if I rev the engine with the clutch in through the same rpm's that the noise occurs at while driving the noise is absent.

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Originally Posted by Randomhero View Post
Its called VTEC!

But really, is your clutch original? Idk what you mean by bearing noise (lots of bearings in an engine!) but could be throw-out bearing on the clutch assemby? Possibly noise from the water pump if it hasnt been replaced. Also could be your timing belt tensioner. Possible valve adjustment needed?
Clutch is original and thought that was the problem but I've taken to 3 different shops and a trans specialist who all say it is good. I also have tried to start it in 3rd to see if it slips but nope it grabs hard still. I was thinking a wheel bearing but it doesn't sound like any wheel bearing I've heard before. It's also started making the same noise at upper rpm's like 4 - 5k. Valves probably need adjusting but to me it sounds like a trans issue or something around there because when the clutch is in and I try to reproduce the noise by revving with it in no noise.

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Originally Posted by maluballa89 View Post
something like this started happening to me about a week ago...sounds like the same scenario...havent had a chance to look under the car yet...

v6-6 137k
I'm flying out to Texas for a few days but when I get back I'll see if I can get the noise on video for everyone to hear, maybe same noise. I was supposed to take it to the shop tomorrow to get checked out but my flight time got changed so it's gotta wait till monday.
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Old November 14th, 2012, 04:51 PM   #5
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So I took the car to the shop today, found out the rear mount that the cat connects to is just about gone. Went for a test drive and realized that with the engine revving back down through 3k rpm there is a vibration that can be felt in the car. They think that is the problem so I'll be replacing that soon.

Maluballa89 might wanna check the rear mount as well.
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Old December 4th, 2012, 11:40 AM   #6
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time for pre cat deletes
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Old December 4th, 2012, 03:56 PM   #7
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Originally Posted by maluballa89 View Post
Jakefrom did you get this ironed out? When you say rear mount what are you referring to? are to talking about the Cat -to- Catback exhaust attachment?

-my noise is getting worse but no vibrations in the cabin
I think he's talking about the rear engine mount. There may also be a bracket going from the engine mount to the cat, but I doubt that's the problem.
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Old December 23rd, 2012, 05:55 AM   #8
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Sorry for late reply. I meant rear mount as in the rear engine mount. Turns out the rear mount is done for. Was supposed to be replaced this week but honda gave me the wrong mount. Getting it fixed next week and I'll let you guys know if that was the problem. The mechanic said it has a lot of movement and could be causing some sort of harmonics issue and that the exhaust does attach to the rear mount which he says can explain why he was able to move my exhaust back and forth (front to back) very easily. I'll see about getting the video up with some decent sound this week, prepping for finals has been crazy.
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