Engine lacks power, unable to pull codes, CIL light is on. - Page 2 - 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 05-11-2008, 07:18 PM   #11
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The Prom chip can be removed & replaced without problems.
If the fuses are all good & the other coils don't spark then remove the computer & prom & give all the connections a good look. Make sure no pins are bent or broken.
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Old 05-11-2008, 07:24 PM   #12
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Do you know where I can get a scanner that will pull codes for a pre obdII computer that has a obdII test connector?
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Old 05-11-2008, 07:36 PM   #13
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Ok, I checked all fuses which are good. I removed the battery, removed the ecu, removed the access cover to the prom and removed the prom. Checked all pins which were good and straight. And there is still no start.
We replaced the cranksaft position sensor with still no start.
We don't have any electrical schematics to trace any problem areas in the wiring.
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Old 05-11-2008, 08:04 PM   #14
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Ok, I posted back to another guy who replaced his ecu because he was having the same symptoms as we were before the car wouldn't start. I was wondering what year range can I pick from when looking for an ecu and does it have to be a bonneville or any GM car?
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Old 05-12-2008, 02:15 AM   #15
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could it be the key security thing.. my car did this
but i didnt touch my computer
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Old 05-12-2008, 08:53 AM   #16
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Please find a local mechanic that can read your codes before spending money on anything.
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Old 05-12-2008, 01:07 PM   #17
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Quote:
Originally Posted by willwren
Your car is a hybrid PCM in between OBD1 and OBD2. Most people at Autozone aren't 'educated' enough to know this.

You need a scanner capable of reading OBD1 PCM'* with a 16 pin cable. Not easy to find. Post your location, we may have someone nearby that can pull the codes for you.
I am located in Zephyrhills, FL zipcode is 33541. Do you know of one in my area?
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Old 05-12-2008, 01:40 PM   #18
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bump
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Old 05-12-2008, 02:00 PM   #19
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Slow down, take a deep breath & tell us what'* wrong & what you've done so far. Did you really change the crank sensor yesterday? You asked how to check it at 6:00 & had it replaced by 6:36 while also checking the PCM & PROM. I'm wondering if you changed the cam sensor but said crank sensor.
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Old 05-12-2008, 04:43 PM   #20
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I replaced the crank sensor while we had the harmonic balancer off because we thought that it may have been bad and it looked pretty rough anyway.The car still doesn't start and has a history of stalling periodically anywhere from 10 to 30 minutes after startup and it would start back up most of the time after it stalled but sometimes it wouldn't. We thought that maybe the computer was bad originally and was going to replace it anyway eventually. Now I figured that it finally may have gone bad. There is no spark at any of the coils and the fuel pump doesn't run. the only thing that happens is the starter spins the engine over. I wondered if that maybe if I didn't unplug the computer if it would have still worked. I have no way of testing any of the current going to the ecu with out the proper schematics. That is why I was wanting to know if somebody happened to have electrical schematics for a 1995 Pontiac Bonneville se with a 3.8L. I wanted to make sure before I replaced the ECU. All of the fuses are good everywhere. I was told that the ecu is an OBD 1.5 and was asked for my location so I could be referred to a local tech that has a tester that would work. I don't want to have to pay $50 dollars for a diagnostic to find out that the ecu is bad. I'd rather use that money to put towards an ecu if I can test it myself to see if it is bad. Now that the car doesn't run, i'd also have to pay to have it towed to a dealer before they could even have it tested. Unless I can just take the computer to them.
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