Misfires under load, needs some input - Page 5 - 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 01-11-2009, 11:17 PM   #41
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Is there any chance you can get a wideband O2? I wonder if your AFR is lean. I'm really starting to run out of ideas here. Would really help if you could get a good scan to see what'* going on.
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Old 01-11-2009, 11:38 PM   #42
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Dan, will HP tuners give me the data u are looking for?

Don

changed the fuel filter too. will be testing fuel pressure tomorrow as well.
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Old 01-11-2009, 11:42 PM   #43
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I think it should help. Have you made any changes to the PCM?
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Old 01-12-2009, 12:07 AM   #44
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The car is stock except the air filter, no changes to the PCM.

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Old 01-12-2009, 12:38 PM   #45
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EUREKA!!!! Found the problem. I have checked this numerous times but nothing. It is the UIM. There is pooling under the sc. I wonder if the seafoam yesterday cleaned it out enough to let it pool. I dunno but there is now.

BTW, the flow test on the cat was fine.


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Old 01-12-2009, 12:48 PM   #46
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Sounds like it'* tiem for a LIM gasket replacement.

INTENSE-Racing.com: Lower Intake Gaskets (L67/L32)
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Old 01-12-2009, 03:08 PM   #47
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It will be fixed under warranty, so I don't know which gasket they will use. They are going to do the intermediate steering shaft and all the engine/transaxle mounts too. $50 deductible on my service contract. The good thing is that I have checked and verified everything else that could have caused this problem. LOL. A bit of a headache but it is good to know. When they get it fixed it is getting a tranny flush, filter and shift kit. Radiator flush and all the fluids replaced with Royal Purple synthetic.

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Old 01-15-2009, 02:57 AM   #48
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Ok, intake manifold gaskets changed, new coil packs. Problem got a lot better. #1 Cylinder is missing a little. Have new autolite plugs and borg-warner wires to install tomorrow. We think that will solve it. The gaskets were toast. I will let you know.

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Old 01-15-2009, 08:11 AM   #49
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Glad you got that fixed. That problem can really mess up a engine.
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Old 01-15-2009, 08:55 AM   #50
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Not quite fixed yet, but we'll see.

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