Still Missing - 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 08-17-2004, 11:57 PM   #1
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Well, I just got rid of the Bosch plugs and put in AC Delcos and still have a miss under load. They are factory gapped to 0.60 so I didn't bother checking. Do you think there is a possibility they might not have gapped them propery?
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Old 08-18-2004, 12:40 AM   #2
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Did you check the continuity of the wires? Also try swapping the coils around and see if that helps? You should always check gap, they may have gotten bumped in shipping.
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Old 08-18-2004, 12:46 AM   #3
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Have you scanned for codes yet? That could tell you exactly what is causing it.
I was told the NGK were pre-gapped for .060" and the first time I put them in my 1994 it was only running on 3 cylinders. Pulled the plugs out and found them all down around .035" -.040". That was almost 1.5 years ago, and now the 4th time I've put NGK'* in Ol Blue I checked the gapping and found the same factory gapping to be .035"-.040". Way off and causing heavy missfiring. I'd suggest pulling them and verifying the proper gapping. If they aren't correctly gapped you can pick up a cheap plug gapper for like $0.99 at Wal-Mart or Fleet Farm, etc...
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Old 08-18-2004, 01:37 AM   #4
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Just my opinion but I would go in this order until the problem is solved:

1) Check old plugs for carbon tracking, particularly cylinders 2 and 4:

If you find it on a plug then replace the corresponding wire because it is toast. According to GM this is a particular problem on 93-93 L27 and L67 engines. I don't know why.

2) If you have a multimeter, check the resistance of the wires. Make sure they all conduct electricity.

3) Check the gap on your spark plugs just in case they were knocked in the shipping process.

4) Replace all the wires.

5) Check the resistance on the ignition coils.

6) Excessive alternator output? Now I'm running out of ideas.

My money says wires. I've had bad wires twice.
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Old 08-18-2004, 03:37 AM   #5
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It may be a coil pack issue.

Factory Gap on those TR55'* is .04ish Ol blue eyes, and they shouldn't be gapped to more then .048 i believe. Otherwise it'* a bad angle for the electrodes
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Old 08-18-2004, 07:44 AM   #6
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I'd have to agree:
Check plugs (excessively quick wearing)
wires (for continuity)
coils
wires feeding up to coil pack plate
I've had problems with a coil pack on another car so if your plugs and ires are fine that would be my best bet.
KK
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