LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

slight miss

Old Dec 5, 2010 | 11:18 PM
  #1  
cthomson21's Avatar
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From: Tennessee
slight miss

O.k. guys yal have been extremely helpful so far with my car I had another question for you though. I have been noticing my car has a slight miss at idle wen warmer than about 175 degrees. It does it no other time than that. When I give it gas it has no hesitation, no stumbling, nothing different than at any other temp. When you crank the car it idles fine and nothing seems to be wrong. There are no trouble codes or anything. It has new plugs and wires, o2 sensors, fuel filter, fuel regulator and a few other parts. I know my fuel pressure is a little low around 37 lbs i think, I'll change the pump wen christmas break gets here. Just curious if this is causing it or is it some kind of heat sink in the electrical system? I thought possibly that maybe it idles fine when its cold because the gas is more dense and as it heats up that the thinner gas causes an idle issue, but I have no idea and suppose it has to be fuel or electrical.....
Old Dec 6, 2010 | 05:24 AM
  #2  
Guest47904's Avatar
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Re: slight miss

Unplug one of the O2s and let it warm up and see how it runs. If it's ok then, you have a closed loop control problem.
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