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When cold RPM's very about 300 to 500 if ...

By dmodar on Oct 08, 2009

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When cold RPM's very about 300 to 500 if I try and drive the car it will backfire and has very little power. After it warms up the car runs perfect like there is nothing was wrong. This is a 1985 corvette FI 350

Comments:

Oct 08, 2009

- Are there two different coolant temperture sensors one for the PCM and one for the gauge? The gauge seems to be working fine.

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Best Solution

posted on Oct 08, 2009

motor1258

Rank: Guru Motors

Expert
Rating: 89%, 2160 votes

I think I'd be looking at the coolant temperature sensor. It supplies info regarding engine temperature, thus regulates fuel accordingly. If it tells PCM, that engine is already warm, when still cold, it can cause those conditions as well as others.

Comments:

Oct 08, 2009

- Usually one back of engine on passenger side for gauge. and one up front near throttlebody area, for PCM.

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This Problem Also Relates To: 2004 Chevrolet TrailBlazer 1997 Chevrolet Cavalier 1996 Chevrolet Blazer 1998 Chevrolet Cavalier 2003 Chevrolet Suburban 1500 2005 Chevrolet Equinox 2006 Chevrolet Cobalt

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