Car chugs at highway speeds - 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 08-11-2004, 09:39 PM   #1
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Default Car chugs at highway speeds

1996 Bonneville */C chugs at highway speeds. Car had new TR55 NGK plugs, new GM wires. The coil pack checks out perfect.

Car still chugs at highway speeds with torque convertor locked in 4th from 55 mph to 85mph. Chugging is fairly low frequency and irregular. I'm sure it'* not an ignition issue since we can go miles like this and no code goes up and the cat convertors are not at all clogged.

It'* probably an issue in the valvebody. Feels like torque convertor engaging and disengaging erratically.

Car is a 1996 with 156,000 miles.

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Old 08-11-2004, 11:29 PM   #2
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You need to get a scantool on it while you're driving it, and watch TC slip in lockup above 48mph with the cruise set on a level road. I'll bet it'* less than 10 rpm'*, which is good.

Chances are, you STILL have an ignition problem. Check the resistances of all 6 plug wires and post them here if you can.
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Old 08-12-2004, 12:45 AM   #3
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Thanks, that'* what I'm gonna do. It'* becoming consistent enough now. Will keep people posted on this.
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Old 08-17-2004, 05:57 AM   #4
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My 96 SE does something like that. When it shifts into OD sometimes its a little hard and it will chugg I quess, but only when im barely acc. not going over 2500 rpm'* and if I push on the gas till it shifts back down its shifts pretty hard.
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Old 08-17-2004, 10:57 AM   #5
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I had this problem with my 97 and it drove me nuts. Finally replaced plugs with Delco platinum, and put on MSD wires and coils. No more problem. MSD stuff well worth the money. Car now has 115K, and starts quicker and runs smoother than when it had 15K.

Mike
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