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weird s/c noise

Orange04CompG

Orange04CompG

New member
so i have a 04 comp g and whenever i push the pedal about 1/2 way down and get to about 3k rpms and the boost gauge is about half way up, the s/c makes a weird variation of its normal whine. its like if youre standing on something thats vibrating hard and you say something your voice sounds kind of shaken up, thats what it sounds like. its really hard to describe. ill try to get a video up in a bit. also when it makes the noise you can feel the car holding back. any ideas what this may be? im stumped. :th_scratchhead:
 


and i dont think it would be the coupler because if it were, wouldnt it make the noise at idle too? mine only makes it at higher boost psi and its more of a strange variation of the whine than a rattle that would be caused by the bad coupler
 
There was a post just like this a few months ago, it was basically a shuddering. I'll try to find it but I can't guarantee it with the search.
 


The post I failed to find had a video too. He'd floor it, it would accelerate fine until like 3,700 rpm, shudder to 4,500 then accelerate perfect to 5,800 and shift.
 
Shuddering could be several things, just out of curiousity when was the last time you did a tune up? and how many miles does your car have?
 
i just changed my plugs like a month and a half ago and its ran great until a couple days ago. the shudder isnt from the engine, its from the s/c. if you watch the videos you can hear it. the car has 138k but most are highway miles
 


sometimes a bad harmonic balancer can cause a rumble in the engine or a bad engine mount. had that happen on a 1973 camaro the motor mounts were the wrong ones. you would end up with a vibration in car at any rpm. but that my 0.02
 
Orange04CompG said:
i just changed my plugs like a month and a half ago and its ran great until a couple days ago. the shudder isnt from the engine, its from the s/c. if you watch the videos you can hear it. the car has 138k but most are highway miles
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thats totally your engine shuddering, its just that you can hear the engine via the sc as it shudders. and thats what car with misfires sounds like btw.

what plugs did you put in?
 
pull the plugs, check them out. check the wires to see they are not stuck to the exhaust manifolds or something like that. or a cracked coil.
 


Nope. All my fluids are good. This morning it got worse though. It's definitely the engine shuddering. You can feel it through the gas pedal when you step on it. I'm going to replace my engine mounts with the poly ones from zzp and check my plugs and if that doesn't fix it I'm taking it somewhere to get it looked at. I love my car with a passion but these repair bills are killing me lol
 
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