Ignition problem? - 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 03-02-2006, 01:58 AM   #1
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Default Ignition problem?

This is a continueation of a old thread Misfire under boost

Since then I have had brand new injectors put in and replaced my fuel filter & coils with MSD replacements & NGK TR 55s @ .055". The car feels nice and smooth till about 5psi and then some missing starts to take place. Not sure if the boost has much to do with it but it happens about the same time.

Just alittle bit ago I pulled my wires and checked the resistance of each one. Then I pulled my coils off and clean the primary hookups and then put some dielectric grease on there and on each tower on the coils and end of each plug.

I go for a drive, gently working into alittle more throttle at a time. I'm on the freeway doing about 60-65mph and decide to go to WOT... Transmission down shifts and for a split second starts to pull and then the power just falls off completly. I instanly get out of that gas once I felt the loss in power. The motor didn't stall out but it felt like it very well could have. Right after this the motor is running smooth, quiet & I figure it was time to ease her home and jump on BC.

WIRE RESISTANCE (per advice of willwren)
1: 45 ohms
3: 70 ohms
5: 136 ohms
2: 84 ohms
4: 135 ohms
6: 153 ohms


Time for a beer.

Ed
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Old 03-02-2006, 08:54 AM   #2
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Ed...have another beer.

Any issues you see are going to seem worse on boost. Which pulley are you running?
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Old 03-02-2006, 03:33 PM   #3
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I've got a 3.4" on there
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Old 03-02-2006, 03:36 PM   #4
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Seems like we are missing something that is the problem. Can you ohm your coils and make sure they are good.
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Old 03-02-2006, 03:40 PM   #5
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They are brand new MSD coils....But if you would like me to I can run outside and check
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Old 03-02-2006, 03:42 PM   #6
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Unless this is a sensor or something...I'm starting to run out of possibilities
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Old 03-02-2006, 03:47 PM   #7
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hmm; it'* not set in stone but it looks like Corvettecrazy and me might meet on Saturday and we'll see what we can figure out with his scanner.
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Old 03-02-2006, 03:49 PM   #8
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I'd like you to try the boost bypass trick. I suspect your PCM may be trying to dump boost due to KR. That pulley seems a wee bit on the small side for a drop-in K&N.
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Old 03-02-2006, 03:58 PM   #9
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Is this what you would like me to try?


The idea of no boost bypass scares me but you know your stuff so I'll go with it if that link is what your speakin of.
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Old 03-02-2006, 05:04 PM   #10
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Correct. Only as a test. There is a risk running that way long-term. I just want to see if it'* the PCM commanding a boost dump. If it is, we'll have to get a scan to see why for sure.

All we're doing is removing the PCM'* ability to dump for a little troubleshooting.
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