Ignition/Fuel Problem? - 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 03-10-2008, 11:30 PM   #1
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Default Ignition/Fuel Problem?

Sorry for the multiple posts on the same issue, I'll start fresh.

Symptoms:
Upon starting the car it usually takes 20-25 seconds of cranking before the engine even fires. Once the car then begins to warm up I have a stutter/miss anything over 3/4 throttle. I am not boosting more than 5lbs, and my rpms won't go any higher than 4000.

Current Codes (March 10th)
P0670
- Quad Driver Module, QDM 4 Fault

History Codes (March 10th)
P0321
- Ignition System Problem, 18X Interrupts Lost Signal
P0361
- Ignition System Problem, Electric Spark Timing, EST Not Toggling
P0705
- PRNDL Switch Failure

What I Have Done:
Willwren gave me information on the QDM 4 Fault. It runs the high/low fans, SES light, and ac clutch. I have my SES light fuse pulled and assume that this is why the QDM 4 Fault appears.

The next thing I did was check the secondary circuits of my ignition coils. They all turned out to be at 7.3 ohms which is in the correct range and identical on all three.

I then moved on to remove and clean my throttle body along with the MAF and IAC. I also unplugged my MAF and EGR valve one at a time and drove the car to see if either was causing the symptoms and I saw no change in performance.

I put new TR 55 spark plugs in around a month ago, my plug wires look fine, new fuel filter, new TPS, and rebuilt trans.
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1994 SSEi, CAI, TR 55'*, Nokya Yellow Headlamps, Rebuilt Trans, 185000 Miles, It'* my supercharged pizza delivery vehicle!
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Old 03-10-2008, 11:55 PM   #2
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Did you ever put the fuse back like I told you to? If the fuse removal knocks out QDM4, it'll take out other functions.

Did you check the coil primaries? If not, do so.

Pull your plugs and check them. They should all be a light tan color. Tell us which ones aren't (in order).

Quote:
Originally Posted by willwren
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.
There'* a ton of missing information and troubleshooting from the topics above. I don't expect anyone to go back and read it all. It would be nice if you would write a few VERY short phrases explaining what each suggestion was and the results you found.
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Old 03-11-2008, 12:34 AM   #3
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I will look at these things as soon as possible and report back with my findings. I am going on vacation this weekend so I will have to find the post and report back when I get this stuff done. Thanks.

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1994 SSEi, CAI, TR 55'*, Nokya Yellow Headlamps, Rebuilt Trans, 185000 miles, It'* my supercharged pizza delivery vehicle!
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