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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-20-2003, 07:40 AM   #11
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I wouldnt argue that Rat doesnt have a good case, looking back at the recent posts, I would have to say there are good suggestions, thus far. I just disagreed with him saying a bad valve would "NOT AFFECT IDLE", ( not arguing ) .
jkinney, my past expierences with my own EGRless engine is what I based my post on. I had a Exhaust Valve that was half burnt away & my idle was perfect! Then again, I regularly clean my TB, IAC & MAF too.

projectbonnie, you mention that you had the intake off. Are you sure you re-sealed it properly again? Not to doubt your work, but I've seen this happen even with the best mechanics. Some Non-GM Techs forget to silicone the lower intake gaskets properly to the heads at the corners. 1) It will cause an oil leak due to the gasket moved while installing the intake again. 2) If you didn't torque down the intake bolts properly, a uneven gap may result too & thus cause a small vacuum leak among other problems. You also mention you cleaned the TB. Is it possible that a small piece of debris got lodged in there while cleaning & is causing this? Did you clean the IAC too? If so, did you re-adjust it back to it'* factory setting as it is adjustable? What did you use to clean the TB with anyways? If you used Carb Cleaner, it may have ruined a seal or two due to it'* corrosive nature on o-rings. FI Intake Cleaner is ALL that is recommended on these engines. Have you checked the TPS mounting bolts yet? If loose they can effect idle if the TPS is allowed to move from it'* original setting too.[/quote]
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Old 10-20-2003, 08:02 PM   #12
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as i mentioned before ithe car ran this way before i did any work on it. i did check the bolts on the tps and they are tight. now this is going to make me sound like i dont know what i'm doing but i was in a rush due to the rain. when i was pulling the coil to have the icm tested i left the key on and after i loosened the coil and grabbed it and it shocked the ***t out of me don't know wheather that makes a diff or not. oh yea i used tb cleaner, the kind that comes in a gallon can, i let it soak for two hours then scrubbed it with a tooth brush. of course i had all sensors and electronics off of it. the intake is a newer intake, off a 92 with less miles, due to the fact that the old one had some coolant paths that were not supposed to be there. glad thati caught it because when i lifted the intake off the old gasket crumbeled to pieces. oh yea i started the car and started pulling the wires off the coil and when i pulled #4 the idle didn't change as it did with the others, but it was still sparking. thanks for all of your help thus far much appreceated
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