Trouble Shooting Driving Me Crazy!!! - 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 03-09-2008, 10:42 PM   #1
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Default Trouble Shooting Driving Me Crazy!!!

I did some more research and work on the car this weekend to try to solve my stumble/miss at high throttle speeds. I tested my coils and the all ran 7.3 ohms or resistance, shouldn't be a problem here. I also pulled off my throttle body and cleaned the p*** out of it. One thing that I saw when I removed the throttle body was a puddle of coolant sitting in a groove in the supercharger!?!?! It was right behind the throttle body and I am assuming that it is getting through the gasket between the TB and supercharger. My engine oil doesn't appear milky and my coolant doesn't look bad when I pull some out of the reservoir.

The hard start continues... usually 20-30 seconds of cranking before the engine fires and the engine stumble also persists. It gradually gets worse as the engine warms up and by the time it reaches 200 degrees I have no power past 3/4 throttle. Another thing is that I get no more than 5lbs of boost, once I hit this range the bogging begins. About a month ago I was laying the boost gauge down on 10 in the cold weather. The only code that I continue to read is the QDM 4 fault because my SES fuse is pulled. But the QDM 4 shouldn't have anything to do with how the engine is running. (Willwren gave me a list of things that it controls.)

Any suggestions on what is going on here? Plugs are new NGK 55'*, wires look fine, new fuel filter about 2 months ago, new TPS, checked the vacuum lines, and cleaned the throttle body.

Thanks in advance!!!
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1994 SSEi, CAI, TR 55'*, Nokya Yellow Headlamps, Rebuilt Transmission, 185,000 miles, It'* my supercharged pizza delivery vehicle!
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Old 03-09-2008, 11:13 PM   #2
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Regarding the leak at the TB. I just finished replacing that gasket in mine (non-SC), that was leaking coolant to the OUTside of the TB. I found one of the 3 nuts to be ever so slightly loosened, which I think was the cause. As far as the acceleration problem, I am chasing a similar problem too, so am interested in what kind of feedback you get.
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Old 03-10-2008, 01:21 PM   #3
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I remember all of my bolts being tight but not as tight as I put them back on! But I didn't have the gasket at the time to replace the old one, so I will be picking that up and replacing it ASAP. I also hope that we can find some help with this... these guys usually know quite a bit about the bonnevilles!! :P

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1994 SSEi, CAI, TR 55'*, Nokya Yellow Headlamps, Rebuilt Trans, 185,000 miles, It'* my supercharged pizza delivery vehicle!
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Old 03-10-2008, 01:35 PM   #4
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Seems to be a lot of problems posted re: acceleration.
I see you have cleaned the TB, so that may have included the MAF sensor, between the TB and the air inlet. Sandrock had me clean that with CRC brand MAF sensor cleaner and it helped a lot, but I still have something not right.
Here is one that may offer some suggestions:
http://www.bonnevilleclub.com/forum/...ic.php?t=95003

Mine is a never ending saga that first had to zero in on computer codes. They usually "threw" with acceleration. Hoped if I fixed those that the stumbling would be resolved. Codes are gone, and runs much better, but still not up to par.
http://www.bonnevilleclub.com/forum/...ic.php?t=92971
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Old 03-10-2008, 06:08 PM   #5
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I just got done reviewing the second thread as I had read the first yesterday I do believe. In response to the second thread... I am not pulling code 18 or 42. I was pulling 1670 as a QDM 4 fault which is a part of the computer that runs my a/c clutch, SES light, and high and low speed cooling fans. I do believe the 1670 code is present because I have the fuse pulled for my SES light because of a e-brake sensor that is shot and dings constantly while I drive. I did clean my MAF and IAC when I cleaned the throttle body and nothing seems to have made a great impact.

This stuff is driving me nutz just as your problem was and I hate it when my cars don't run on the tip top especially since I just got a job delivering pizza.

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1994 SSEi, CAI, TR 55'*, Nokya Yellow Headlamps, Rebuilt Trans, 185,000 miles, It'* my supercharged pizza delivery vehicle!
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Old 03-10-2008, 07:18 PM   #6
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I just got back from Advanved Auto and I scanned my codes again. I got something new today! Hopefully it is something I can fix instead of continuing to guess what is going on. As said at the beginning of the post I am not boosting past 5lbs, my rpm usually wont go above 4 grand, hard start... usually 20 seconds of cranking before the engine fires, and the engine miss at higher throttle speeds. The miss gets worse as the car begins to warm up.
Here are the Codes:
P0321
-Ignition System Problem, 18X Interrupts Lost Signal
P0361
-Ignition System Problem, Electric Spark Timing, EST not toggling
P0670
-Quad Driver 4 Fault
P0705
-PRNDL Switch Failure

The first two codes are the ones that I need help with. I think the QDM 4 Fault is present because I have my SES light fuse pulled and the PRNDL failure shouldn't have anything to do with my engine miss and other problems. Thanks, Josh

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Old 03-10-2008, 09:24 PM   #7
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I got your PM. Unfortunately, in researching your history on this problem, I find that you've got MULTIPLE topics on the same thing.

This is very confusing. It makes it virtually impossible for any of us to follow all the troubleshooting and advice.

I'm locking this one, as well as this one:
http://www.bonnevilleclub.com/forum/....php?p=1042403 (March 6th)

And this one:
http://www.bonnevilleclub.com/forum/....php?p=1039065 (Feb 28th)

I now leave it to YOU to very carefully assemble the contents of all three topics into a new topic, very concise and detailed, and make sure you cover what each person suggested, and what you did to troubleshoot it, as well as the results.

I don't have an hour to sit here and review the contents of three topics that are all related to exactly the same problem.

I'm being very firm on this one. It'* impossible to keep up with multiple topics when we don't know what was suggested or done in the other ones. If you expect us to help, you have your homework to do tonight. And no more new topics on this problem other than the new one you're about to start.

We HAVE to know what you've done and what you haven't. If we suggest something, you need to do it and answer us before moving on.
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