Misfire under boost - Page 2 - 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 12-17-2005, 07:50 PM   #11
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Well I got back from my test drive & like I thought the misfire is still there. I have the MSD whatever wires that have a super low impedance (100-150ohms per ft, I got them cuz I figured they had a decent quality plus they looked cool.) But I'm looking for a much higher impedance on the wires?
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Old 12-17-2005, 07:52 PM   #12
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You want an even progression of resistance from 1 to 3 to 5, then slightly more and even from 2 to 4 to 6.
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Old 12-17-2005, 08:08 PM   #13
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While your checking the resistance of the wires you can also check the resistance of each of the coils. All three readings should be very close.
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Old 12-17-2005, 08:22 PM   #14
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Ted is right. Good time to do it. Procedure and readings are in Techinfo for the coils.
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Old 12-17-2005, 09:57 PM   #15
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I had msd wires for a year. Two of them started to carbon track really bad, effed up two plugs, and made it run like crap.
I bought cheapie 25 dollar ones just to fix it, they lasted quite a while until i changed them to Beldens..
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Old 12-19-2005, 02:51 PM   #16
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i replaced my spark plugs and it was fine for a little bit but then it did it again, i got readings on the spakr plug wires but i dont know what they should be at, front bank left to right was .7k ohms .9k ohms and 1.2k ohms rear bank was all around 1.2k ohms, is that normal or do i have a problem?
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Old 12-19-2005, 02:55 PM   #17
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The wires can be a tough thing to test. With merely an ohm test..they could test well...but with 30,000 going through them...it could be a different story. Simplest test for me on plug wires is to wash my engine down. When it'* running and you hose it directly..there should be no change.
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Old 12-19-2005, 03:01 PM   #18
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how would that detect any possible internet damage tot he wire? cause there isnt anything visible outside
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Old 12-19-2005, 03:08 PM   #19
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Originally Posted by NERV
how would that detect any possible internet damage tot he wire? cause there isnt anything visible outside
It wouldn't, unless there is an old wire or something that is leaking that you merely can't see. This is why many like to check at night in the dark to see if any sparks are jumping. Daytime you use water...it helps ground them even better if there is an issue.

Internet...ROFLMAO...thanks man...needed the laugh.

I got the 97..ran great..wires didn't show anything wrong at all... I cleaned it and they were so bad it set a code....New wires and plugs ...never another problem.
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Old 12-19-2005, 03:47 PM   #20
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Yours is ALWAYS #4. I suspect at this point you have an intermittent break in the center conductor of that wire or a short through (arc) the insulation to ground somewhere.
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