Thread: Strange sounds under load

That rules the resonator out then dont it. Lol



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Lol yeah. I just can't imagine what it could be other than something inside the transmission. Could that sound be coming from the engine? It just doesn't seem like it could be..

I'm going to have a buddy replicate the sound while I poke around with a stethoscope.

I think I have the exact same noise as you. It only happens when accelerating reasonably fast from a stop and when engine load goes down it fades away. It also happens when I turn and begin to accelerate. It makes what I would call a growling sound at a pitch lower than the normal engine note. Not a bearing type growl at all. It has sort of a vibration feeling in the pedal and to a much lesser extent the steering wheel. Let me know if this sounds like the same thing you are experiencing. And I'll continue with what I've found out so far.

This is probably the closest relation to what I am experiencing! I definitely feel it a bit in the steering wheel and pedal, but mostly the pedal. It's almost like the subframe is vibrating, right? It definitely sounds like some kind of metal on metal contact but more of a vibration instead of like a clatter.

Does your car make the sound while moving and giving it hard acceleration?

Also, have you seen my videos?

I've watched the videos, the very first one at that 14 sec in I could hear what sounds a lot like my problem. And no it doesn't make the noise if I'm cruising at like 30 or above and put the pedal down.

Here;s the thing though. One of my swaybar brackets on the frame broke this winter and I just fixed it (new bracket and bushing). Upon doing this the noise went away a lot. Like I used to have to really feather the gas for it to not do it, and now it's only if i try and accelerate faster than normal. Sooooo, I'm thinking that it definitely has something to do with the swaybar or something else, contacting the engine or exhaust under load. I just haven't been able to figure out what..

Hmm. I have the GMPP sway bar and recently replaced the bushings so I don't believe that is it.. When my swaybar was broken, it would clunk a lot.

I think your car is in the infancy of what mine does, because mine only used to do it from a stop like yours does, but now it does it even when rolling.

It happens from a roll, just not a roll over about 30mph. Does the sound happen when you go over a bump and the suspention flexes a reasonable amount with your foot on the pedal?

I'm at school for another week, but after finals are over the first thing I'm gonna do is get under there and try to figure this thing out...

It's gotta be something coming in contact with something it shouldn't SOMEWHERE... Probably why fixing my sway bar made the noise slightly less common because with that fixed the body is rolling less making contact more difficult.

K Slice, did you ever end up figuring it out? Also, I have a video here that I would assume shows it also does it while the car is not moving

https://www.youtube.com/watch?v=Zjro8cC2OUc

I haven't gotten under there yet, had to take an unexpected summer class (FML) that's been taking up a lot of my free time. This week I'm going to need an oil change though so I'll be getting under it and taking a closer look around. I've never tried to duplicate the sound brake-torquing it before. When I head to work tonight I'll see if I can. Then I just need to find someone I can trust to do that while I take a look..
I'll get back to you as soon as I can.

Sounds good. I have a co-worker at the company I am doing a co-op for and he's pretty knowledgable about grand prixs, so I have a feeling between one of us we will have the solution soon!

Power steering pump? I've had a few of those go bad on me. Bearing went bad and the pulley shaft wore a vertical hole in the pump.. 1 of my gtp's I would hear power steering fluid pressure at higher rpm.. only thing you can do is pull the belts and go thru the pulleys