Misfires under load, needs some input - Page 6 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-16-2009, 03:02 AM   #51
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Sorry, was going to post something here, then realized I missed a page or 2 of posts..

Last edited by EasyE; 01-16-2009 at 03:05 AM. Reason: error
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Old 01-16-2009, 09:53 PM   #52
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Im havn same problem. It is strange, that I also replaced all the plugs and wire recently before it acted up. The sixth plug was burnt up and not firing. Same thing now though with misfire after 2 on boost. I bought a coil and switched it to each one with no help. Did replacing all of them help, or just a waste of money? I hate that I have to g-ma a supercharger!
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Old 01-16-2009, 10:07 PM   #53
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Have you checked the ignition module? I read on another forum that someone did this for a '98 and fixed problem. I'm not sure what it is, I'm not the best mechanic, but will look into it and maybe try it out.
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Old 01-17-2009, 03:33 AM   #54
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Ignition module has been thoroughly tested. It'* fine. Will be putting the new wires on tomorrow. Compression test on cyl 1 is fine. If the wires don't solve the problem, the only thing left is the injector. Will let you know.

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Old 01-17-2009, 10:16 AM   #55
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#1 is very close to the oil dip stick. Make sure it'* not touching and grounding out.
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Old 01-17-2009, 04:46 PM   #56
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How did you isolate to #1?
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Old 01-17-2009, 04:50 PM   #57
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You can pull a code that will say, missfire #1. But the best way to tell if your having problems with one cylinder is to pull the plugs and inspect. All 6 should look very close. But even a little black on the plug will indicate a problem.
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Old 01-17-2009, 05:43 PM   #58
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Finally at long last. Fixed.

After the following:

ECT
Intake manifold gaskets
2 sets of plugs
2 sets of wires
new coil packs

Took it out pushed it from a dead stop to 120 foot on the firewall the whole time. No miss, no stutter nothing. Pulled like it should making between 8 and 9 lbs the whole way. Did it three times.

I may have a starter problem now, but the miss is fixed.

The only thing I have left to work on is the interior lights blowing the fuse. I think that is the passenger visor because the lid is broken and I can replace the fuse and the interior lights will work for a couple of days then the fuse blows again.

The air compressor in the trunk doesn't work when I push the button but the ride leveling system works, you can hear the compressor kick on.

For plugs I went with the autolite xp606, BWD wires and house brand coil packs. Running syntec with the lucas synthetic stabilizer.

Next the plans include a 3.4 modular pulley, CAI, exhaust (magnaflow high flow cat, magnaflow mufflers, resonator gone, and 2 1/2 inch pipe), power log, ceramic crossover, and retune with HP tuners.

What kinda whp should that give me?

Don
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Old 01-18-2009, 02:37 PM   #59
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Is there any one thing that seemed to correct problem? Also, what is ECT? I am considering just changing out all coils. I am curios about the gaskets. I have noticed where is seems I have had a leak around that point. I have to try to do as much or all the work if possible.
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Old 01-18-2009, 03:19 PM   #60
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Test your coils before changing them. You can find most procedures in the tech info section off the main menu.

As for the LIM gaskets. We have a write up on how to change them and it should be posted very soon. Just taking care f a few small details to ensure ease of following the write up. Keep an eye on the tech info section.
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