S/C coulpler?! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Forced Induction All questions and problems regarding Superchargers, Turbos, NOS, ZEX, intercoolers, water injection, etc.

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Old 03-05-2004, 02:05 AM   #1
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Default */C coulpler?!

Could this be the problem i experience? When i rev the car up and it starts to click then u can hear something reving way up, even though the engine is only lightly being reved?
My mechanics teacher said its not a backfire, it sounds mechanical. (this is all done with the car is in park. When u rev it up in park the SC gage goes up, but not much at all.
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Old 03-05-2004, 02:36 AM   #2
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No. The coupler will only be heard at idle.

Your PCM is dumping boost because you're not in gear. It'* not supposed to boost in P or N. Put it in gear, foot on the brake, then rev it.

Moving this to forced induction.
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Old 03-06-2004, 01:38 AM   #3
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when you say its not supossed to boost in park or nuetral does this mean the gage needle should not move at all from -10 ? Cause mine goes up about 1/4 in park or nuetral when reved.
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Old 03-06-2004, 01:42 AM   #4
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I assume it'* seeing the manifold vacuum at idle, so it would be normal for it come up, as long as it doesn't go positive in P or N
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Old 03-06-2004, 05:15 AM   #5
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Correct. That'* perfectly normal.
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