Misfire under boost - Page 5 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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 12-23-2005, 01:02 AM   #41
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Fuzzy, let'* stick to the misfire codes in this topic so the focus doesn't stray. Please start a new topic for any unrelated subjects like your trans.

Street racing stories are prohibited here, and your trans issue needs to be addressed.
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Old 12-23-2005, 06:45 AM   #42
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My focus hasn't strayed.

Let me redefine my question then!!

OK I have the same misfire problem only with number two cylinder!! I related the trans question into it to maybe see if the traction control system shut down cylinders like my mustang does and if that may be causing the misfire problem, and then simply asked if there was some place to buy the valve body parts. Sorry but if all of us have 100000 plus miles on these cars and they ALL seem to have the similar problem, test fine, and seem that they should work fine why could the transmission going bad not possibly cause the problem??

Oh and admins sorry bout the agressive driving in my post, fixed now!!
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Old 12-23-2005, 10:45 AM   #43
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Fuzzy, Traction Control on 96 and newer pull timing (retard timing), not cut cylinders.

Your valve body rebuild is a totally seperate issue. If you are logging Cyl 2 misfires, your ICM is good. Suspects are Primarily:

Coil (troubleshooting in Techinfo)
Wires
Plugs


After that, check the less likely:
Injector (swap two next to each other and see if the problem moves)
Injector pulse
Vac leak (Upper/lower intake manifold leaks at the suspect cyl on L36, LIM on L67 only).
I mention the vac leak simply because it can cause you to run too lean on that cylinder. The vac leak would have to be right at the manifold gasket(*), not at a vac line somewhere.
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Old 12-23-2005, 09:06 PM   #44
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OK thank you.

So now what is LIM?
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Old 12-23-2005, 10:08 PM   #45
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Lower intake manifold. Between the heads, under the SC. UIM is upper intake manifold which you don't have (supercharger replaces it).
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Old 12-24-2005, 02:42 AM   #46
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my coil resistances are fine hot, 5.8 6.0 5.9, ill pull the injector tommorow
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Old 12-24-2005, 02:52 AM   #47
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Keep us posted, Nerv. You got a good one here, but we'll nip it. Might be slow responses over the weekend.
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Old 12-24-2005, 09:01 PM   #48
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couldnt get the fuel rail off i tried to get it off as simply as possible so i didnt get wiring harness off the back end int hehopes that i could tilt it back being that the cyl3 injector is in the front but it wouldnt come out so do i actually have to take off that whole wiring harness and remove that braket on the alternator/supercharger?
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Old 12-26-2005, 06:23 PM   #49
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boy am i pissed, so i was talking to one of the guys at my shop today about my problem and thefact that if it were a vaccum leak i can find it, so he says 'why dont you do a smoke test?' and i thought 'duh why didnt i tihnk of that?' so i did it and wouldnt youknow it? the one line that i didnt bother full tracing is leaking cause it goes to that coal canster or whatever it is underneath the intake and pcm, i saw smoke leaking out near my heatsehild, i opened the cold air box (i got the intake, pcm, and coal canister all in there) and POOF smoke, when it gets light tommorow ill take some suchness apart and repair theleak and getback to you guys
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Old 12-26-2005, 08:10 PM   #50
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wait a minute... god dammit, the smoke mightve been coming out of the intake not a vaccumline, well i shud still look into that vaccum line just to be sure
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