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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 06-10-2003, 07:53 AM   #1
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Default Good time of the day and respect to all! (+)

I have 1993, 3.8 SCh Bonny. I've noticed that acceleration capability very in depends on engine temperature. I mean after short time driving - acceleration is well enouth but after long (after 30-60 min) at the higher temperature - sluggish and from time to time even like if I have taken the truck in tow. Thus all inconveniences begin at hi temperature of the engine. What can it be? Fuel pump, plugs, wires, coils are new. Fuel and air filters too . I have the problem with high mileage (seems of NGK O2sensor ).
Thank you very much in advance.

I care this because I love driving Bonny

Regards, Vitaly
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Old 06-10-2003, 10:39 AM   #2
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Your problem could be related to many different things. Don't know the amount of miles you have on your car, but recommend you check the following:

Check for proper operation of your supercharger.

Has the radiator been serviced regularly (flushed and refilled at either 2 yrs or 30K miles)

Has your fuel system been serviced regulary (injectors and intake manifold cleaned approx. every 60K)

Had a simular problem with my last bonnie (90 SSE) my problem turned out to be the following: the coil pack developed a crack on the bottom of the pack and only became a problem once the motor warmed to operating temp

Check for proper operation of your injectors-may have bad injectors

Is your radiator fan operating correctly

Is your transmission operating correctly. Some times poor engine operation can be a result of a transmission problem

Does the check engine light come on and if so what is the code

Could be a problem with the computer. Had a simular problem with my SSEi, and it turned out to be the computer was bad. Only showed up when the vehicle was at normal operating temp.

Good luck. Keep that bonnie going!!!!
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Old 06-10-2003, 11:07 AM   #3
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Maybe you should run a 180 thermostat to make it run a little cooler? This would be a good idea even if it doesnt fix the problem...
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Old 06-10-2003, 11:44 AM   #4
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Default Dear friends! (+)

First of all - I had replaced thermostat from nothing to 160 degree (there was no any t-stat in my car at all).
Then - after I've replaced the three broken coils to the new one from MSD I finded that one coil was dead and I have to replace it onto the old one, looking good. But obviousely the coil is not so good as the new one. Also I care about NGK O2 sensor because of unormally high fuel consumption.

Regards
Vitaly
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Old 06-10-2003, 12:11 PM   #5
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Default I forgot one important thing (+)

Hard start on hot whithout acceleration pedal pression.
May be this fact will help you to determine the reason
Have a nice day
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Old 06-10-2003, 12:35 PM   #6
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I would say your engine is most likely fine. Now that you have replaced much of the possible problem areas your engine should be fine. What does the engine temp sit at??

I am going to guess its the transaxle..

This guess is without the temp level or other information so if you have further information that would help.

Ty
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