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

Rough idle and SES light..

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Old Dec 22, 2007 | 11:06 AM
  #1  
chris8835's Avatar
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Rough idle and SES light..

Well here's the problem whenever I start the car and let it warm up for about 2 minutes it starts to have a rough idle as it bounces from about 700 back to 1000 rpms. Also driving it is the same way it seems to limp down the road, then after about another 2-5 minutes the SES light comes on and the problem goes away and the cooling fans kick on,and stay on. until I stop and shut it off then the problem repeats once I start it back up. I have had people tell me maybe one of my o2 sensors went bad, could this be true? Since the guy at the shop had to rewire them to extend them to the headers I could see that happening.Im really not to sure at this point any ideas?
Old Dec 22, 2007 | 11:28 AM
  #2  
MEAN LT1's Avatar
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From: Jacksonville,fla
Originally Posted by chris8835
Well here's the problem whenever I start the car and let it warm up for about 2 minutes it starts to have a rough idle as it bounces from about 700 back to 1000 rpms. Also driving it is the same way it seems to limp down the road, then after about another 2-5 minutes the SES light comes on and the problem goes away and the cooling fans kick on,and stay on. until I stop and shut it off then the problem repeats once I start it back up. I have had people tell me maybe one of my o2 sensors went bad, could this be true? Since the guy at the shop had to rewire them to extend them to the headers I could see that happening.Im really not to sure at this point any ideas?

Realistically it could be anything. Check to see what code your throwing instead of playing the guessing game.
Old Dec 22, 2007 | 11:31 AM
  #3  
moparman's Avatar
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From: Louisville, KY
You need to find someone with the appropriate code reader or scan tool to pull the codes.
Keep in mind the '95 is OBDI with an OBDII type connector.
Old Dec 22, 2007 | 11:36 AM
  #4  
ricehammer's Avatar
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From: Roanoke VA
Get the code(s). Fans come on with the SES as a default.
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