98 Bonne Slugish after warm up - 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 05-05-2010, 09:03 AM   #1
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Default 98 Bonne Slugish after warm up

My 98 Bonne runs super great and shifts good when cold. Once warm it still has good power but at certain speeds 30 to 50 when you step on it there is an intermittent bog. Sometimes you have to virtually stand on it to get go and a 3 to 5 second delay. NO codes either while parked or driving. I did check coil packs, plugs and plug wires. The only thing that bothers me is that the plug wires from Car Quest shows over 50k resistance. It does not miss not even once. Do you think once it gets warm the wires are letting it produce a very small weak spark thus killing driveability?
Hey Dan your tech posts have been excellent in trouble shooting. Ideas guys?

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Old 05-05-2010, 09:22 AM   #2
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Drive it hard at night. Then look underneath and see if the catalytic is glowing.

First thought to me is plugged cat. But we need to test that puppy and not shotgun one in there.
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Old 05-06-2010, 10:12 AM   #3
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I did run it in drive instead of OD for 25 miles very hard and went to dark parking lot and it was not red hot, but after starting it back up and driving off it was doggy again. Maybe the converter is just starting to shows early signs of getting plugged?
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Old 05-06-2010, 10:39 AM   #4
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The sluggish when hot could be a bad ICM, electronics don't like heat. But first I would unplug the MAF and drive around a bit. It will stumble at first and you will get a SES light. No getting on it with the MAF unplugged. See if that improves anything. I'm thinking a sensor problem right now, like a dirty MAF
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Old 05-06-2010, 08:46 PM   #5
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Hi Dan,
The TPS & MAF are brand new and I rechecked the plugs wires. OOPs had it on the wrong scale and the plug wires are well within range. This has done this since I bought it 2 years and 20k miles ago. So far nothing done has changed it. I was also thinking electronics. Maybe fuel regulator?
Thoughts?
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Old 05-06-2010, 08:50 PM   #6
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The FPR is vacuum controlled. I'm leaning towards a electrical problem. A fuel problem the car would kind of sputter and then die. A fast shut down tends to be more a electrical problem. Such as a short, or loose wire. Things like a loose wire on the battery cables can shut a car down in a instant, and then start right back up.
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Old 05-07-2010, 12:46 AM   #7
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One thing I did notice that after disconnecting the battery when changing out MAF it ran great for 2 weeks and then back to the intermittent boggy-doggy when warm. It never dies or anything like that just like it takes to long time to downshift and even when it does still low on power then good once your moving. Very weird. Computer issue???
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Old 05-07-2010, 12:56 AM   #8
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Hmm, that'* odd. I would then say have the fuel pressure tested, see if it drops off when the engine acts up.
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Old 05-07-2010, 12:12 PM   #9
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This also did this before replacing fuel pump which had fuel line leaking on top of tank. Fuel filter replaced already too. Seems like when I disco battery to reset computer it runs great for about 2 weeks. Once this one has fixed I will make all know of symtoms and the fix!
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Old 05-07-2010, 12:29 PM   #10
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A good scan might be in order here. I had a car here last year that would loose power when turning from a start. Turned out he was getting over 20* of knock retard and loosing all his timing. He never came back so I don't even know what the cause was.
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