Help! Cutting out under boost! - 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 11-10-2004, 06:46 PM   #1
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Default Help! Cutting out under boost!

OK, I've been driving this car for the past 52,000 miles and it has ran great. Now, when it'* under load, in a pull, when the boost goes over 0 it starts to spit back through the intake(you can hear it) and lose power. It'* like a misfire, but the plugs and wires are new. Any ideas?
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Old 11-10-2004, 07:00 PM   #2
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Hmm, extra fuel in the intake? Leaky injector or fuel pressure regulator?
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Old 11-10-2004, 07:01 PM   #3
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Don't assume your ignition is good simply because it'* new. Check your plugs and wires.
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Old 11-12-2004, 03:27 AM   #4
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Default Cutting out under boost

Recheck your wires and plugs!!!

I had the same problem start occurring when my car had 60k miles on it. Car would run smooth until it reach the beginning of positive boost pressure, then it would shutter and clear up after being in positive boost for a few seconds.

I had wasted a lot of money shotgunning parts (which I no longer dobought a scan tool). I didn't suspect the wires or plugs because I had changed them at about 45k. I drove around with the problem until about 90k when I did a second tune up I discovered that it was either a wire or plug bad. Never tried to figure out which one was bad, was just happy the problem was fixed.

RECHECK WIRES & PLUGS!!!!
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Old 11-18-2004, 12:08 AM   #5
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I'm gonna pull plugs Friday, It'* getting worse now, and I don't know what else it could be. I put some Iridium plugs from a ~2000 NA park avenue in it, maybe they're burned up.
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Old 11-18-2004, 01:07 PM   #6
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Don't forget to check you wires also.. I just resolved a similar situation a week ago.. and it was a bad #5 plug wire.. had me scared to death thinkin it was something major..it was Accel super stock that was on there and now I have Belden'* 7MM premium blue wires with lifetime warrenty so when it'* time to do new plugs again.. I will get new wires too hee hee
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