92 ssei STILL surging under heavy load........... - 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 05-05-2006, 08:17 AM   #1
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Default 92 ssei STILL surging under heavy load...........

Okay I swapped the icm/coils.......I even reset the computer for about a day 1/2 it ran great...I finally thought my prob was over..........Then as I was going to work I have to go up a pretty steap hill I gave it some gas an right before I got to the top it started bucking and surging an cutting out.........I smashed the gas on down and it quit. The ses light came on. When I got home I pulled the code (21). Tps volt low. This car has had 2 new ones on it. Could it be set wrong? It looks like it goes over too far because the left corner of the sensor is hitting the thermo housing. I still think I should check into the bad groud since when it rains out alot it will miss something awful. I dont know what to do. Any suggestions.
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Old 05-05-2006, 08:30 AM   #2
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1992 was the last year with an adjustable TPS. You either have a wiring problem between the TPS and the PCM, or it'* adjusted wrong. It should be (if I recall) no lower than .74 volts at idle.

Code 21 is throttle position voltage too HIGH. You need it adjusted for 0.2-0.74 at idle, and about 5 volts at WOT.
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Old 05-05-2006, 08:45 AM   #3
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Default ssei.

Willwren........sorry for the other post in the wrong one..anyway.......I think that they set the tps at 0.5 at idle and they didnt even give it gas and set it also. I bet this is my actual problem. That would cause it to surge and cut out under a load. Yea, I know the */c coupler would only get rid of the noise, however when doing this I unhooked the neg. battery side and after the job was done rehooked it and the car ran great.....then the same prob showed up. when the ses light comes on I can feel the car like kick down or something. Thanks for all your help . What about the ground problem?
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Old 05-05-2006, 08:50 AM   #4
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Shannon, WHAT ground problem????

Why do I get the impression that you're referring to something in another topic again?
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Old 05-05-2006, 09:07 AM   #5
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Maybe I missed it....is the SES light still on?
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Old 05-05-2006, 10:07 AM   #6
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Default GROUND PROBLEM?

Sorry about that......when it rains out really hard the car will cut out and miss something awful. Someone else toldme it was a ground problem
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Old 05-05-2006, 10:11 AM   #7
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When was the last tune up with spark plugs and wires.

Also what brands of wires/plugs were used?
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Old 05-05-2006, 12:14 PM   #8
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autolite plugs....wires not for sure got them at autozone less than a month ago. I done the night time check and didnt see any sparks anywhere. No the ses light comes on then goes out.
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Old 05-11-2006, 08:16 AM   #9
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Default UPDATE!!!!!!!!!!!!!!!

Hello everyone........just a quick update.......well I adjusted my tps sensor and FINALLY my problem is solved. So much for a local garage setting it. It runs great now no ses light and the surging is GONE!!!! Thank you all for all your help.........The only problem Im not for sure about being solved is when it rains really hard out if it will miss. Should be able to figure that one out since its supposed to rain for a week straight down here.
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Old 05-11-2006, 08:42 AM   #10
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Glad you got part of it fixed.

Rainy misfires are typically attributed to plug wires arcing.

Simulate it at night at idle. Use a spray bottle with water, and mist the engine down while it runs. In the dark, you'll see the arcing.
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