Chugging while at cruising speed. - 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 11-03-2006, 02:29 PM   #1
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Default Chugging while at cruising speed.

Car is a 95 SSEI.
Problem while at cruising speed, let'* say 40 mph, it runs as if I'm releasing the throttle and reapplying it to the same rpm. In other words it'* jurking or chugging and it'* steady as long as I have it at cruising speed. The more I apply throttle the less the problem. If I apply up to 1/2 throttle or more it goes away.

What I have done to the engine just before this happened.

Changed */C coupler
Replaced plugs, TR55
Changed engine oil & Filter
Replaced UIM and LIM gaskets
Replaced air filter.
GM O2 sensor
Throttle Positioning Sensor.
All Vacuum lines replaced

It'* showing a code which is to replace the IAT sensor which I have on order.

Any suggestions?
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Old 11-03-2006, 02:31 PM   #2
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i see that the plugs were changed......what about the wires??
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Old 11-03-2006, 02:32 PM   #3
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You did plug wires too right?

(I'm gonna kick you in the nuts for ordering an IAT) J/k buddy.
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Old 11-03-2006, 03:00 PM   #4
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Quote:
Originally Posted by 1993 SLE
i see that the plugs were changed......what about the wires??

It ran good when I brought it home after purchasing the car, so I didn't replace the wires.

Bill........pm sent.
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Old 11-03-2006, 03:29 PM   #5
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i had similar problems with my honda, found out the ignition timing was off..
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Old 11-03-2006, 03:36 PM   #6
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Quote:
Originally Posted by MNwonderboy
i had similar problems with my honda, found out the ignition timing was off..
Wonderboy.. our timing is controlled by the ECM/PCM and can not be set by means other than reprogramming.
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Old 11-03-2006, 03:38 PM   #7
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Im thinking the plug wires might be a good place to start.

First check them to make sure they arent contacting anything that might cause a problem, like the O2 sensor wiring or the like.

I was in a similar situation after replacing the UIM on my old car, we changed the plugs but not the wires and it started having similiar symptoms, replaced the wires and they went away.
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Old 11-03-2006, 03:45 PM   #8
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Good point LH..

Double check to make sure one isn't resting on the O2 wiring.
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Old 11-03-2006, 03:51 PM   #9
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Quote:
Originally Posted by BillBoost37
Good point LH..

Double check to make sure one isn't resting on the O2 wiring.
Actually I did change the O2 sensor, so I'm going to edit my first post and add it to the list. Oh Ya I remembered one more thing to add to the list.
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Old 11-03-2006, 04:05 PM   #10
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Psst. F.. you can't get a sensor to position the throttle body.. only the throttle itself.

Did you look for a wire touching the O2?
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