car "jerking" -UPDATED - 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 03-23-2008, 12:16 PM   #51
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also, have you checked compression on cylinders? what about fuel pressure check?
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Old 03-23-2008, 09:46 PM   #52
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ive checked fuel pressure, that was one of the first checks i did. its good. no compression check. its throwing a p0420 code, which could be a misfire, or other things that ive already checked(o2'* , cat, etc). somebody suggested i just unplug the maf and drive it a bit to see if thats it. if that dont work, it'll have to wait until my next paycheck, ill take it to a stealership then.
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Old 03-24-2008, 09:17 AM   #53
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ive "heard" that you can also check a MAF by lightly tapping it while idling...if it stumbles any, that is a sign of a bad MAF as well. Not sure how true that is though.
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Old 03-24-2008, 10:06 AM   #54
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I may have missed it in the three pages you have going here.... Have you replaced the throttle position sensor?
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Old 03-24-2008, 10:37 AM   #55
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yes he has. that was last replaced part.

his code he'* got points to a emissions issue really. cat, O2 sensor...so on.

can i ask what O2 brand you used? always a chance of bad parts too. normally a bad o2 will still let it run though, just be really lean or rich...not die though.
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Old 03-24-2008, 01:34 PM   #56
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i put on denso o2'*, alot of people recomended them. the car didnt actually start dying until after i changed the o2'*, it was just stumbling/jerking before. i actually pulled out the MAF and the little wire with the diode was intact. the o2s looked like they needed to be changed, especially the upper. it had a bunch of crap on it, probly from when my coolant was being burned when my LIM failed. but when i changed them, the code didnt go away and it started dying. im thinking its something before the o2'* thats either making it misfire or mess up the mixture.
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Old 03-24-2008, 02:11 PM   #57
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i would be checking compression i think. just to know you don't have a major issue due to coolant situation. could be a bum valve...number of things really. comp check easy to do with guage....
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Old 03-25-2008, 01:43 AM   #58
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ok, one of the guys in my fbody club im in should have one. ill look into that. i noticed just now on the way home, when the car hesitated, that the boost gauge went up, but the rpms stayed at 1k for a few seconds, then went up.
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Old 03-25-2008, 09:20 AM   #59
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someone with SC knowledge on these cars will need to chime in there...im a lowly SLE owner

let us know what you find....
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Old 03-25-2008, 05:04 PM   #60
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Have you tried cleaning the MAF yet? My car would stumble just as the boost gauge hit 1-2 psi. I also noticed the DIC would show around 13 instant MPG. I checked alldata, but could not find a test procedure for the MAF without the use of a scantool.
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