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PostPosted: Sun Nov 20, 2022 1:07 pm 
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Posts like an L67
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Joined: Fri May 23, 2008 12:26 am
Posts: 1218
Location: Charlotte, NC
Year and Trim: 96 SSEi- 157K
All right, I was going to try and figure this out myself, but after lots of farting around with this I am caving and asking for help. This is on my new 1992 SE project, 106k and has been sitting for the past several years. Magnavox ignition.

Condition #1: Will crank like crazy but not fire. Confirmed no spark on any cylinders when it's doing this.

Condition #2: Will sometimes start, and when it does it will run great for a few minutes, then shut off. For every subsequent re-start, it will be harder to start and run for less time, until it returns back to the crank no spark condition. When it wants to stall, I can keep it running if I put my foot on the gas, but as soon as I let off it will die.

Parts replaced/things done:
- fuel pump and fuel filter (previous owner DIY, so can't confirm)
- pulled battery cable boots and cleaned (me)
- tightened loose ICM bolts (me)

I have 92 FSMs, and have been trying to follow the diagnostic procedures, but it's a little bit confusing to me because there are two separate charts for "crank no start" and "starts but stalls". So I'm just getting a little bit mixed up with how to tackle this. So far, my strategy has been to go in order on the diagnostic charts much as I can, and focus on common factors between the two charts, which are ICM and PCM. I realize it's possible that I have a compound spark AND fuel issue, but I'm suspicious that all of this is related. I just can't quite connect it together.

Another important note is that since the car has been sitting, it almost certainly has old gas, which could account for some of the apparent fueling issue. Confirming that the fuel is not bad is also at the top of the diagnostic chart for good reason. However, that doesn't explain the random no spark issue. Any thoughts welcome. I know that the 1995s were the ones that were notorious for eating pcms, but should I suspect that on a 1992?

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PostPosted: Mon Nov 21, 2022 10:55 am 
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Joined: Mon May 19, 2008 6:04 pm
Posts: 25696
Location: Browerville, MN
Year and Trim: 2004 GXP - plus a handful of other Bonnevilles
crank sensor

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2004 Bonneville GXP | White Gold Tricoat | custom built supercharged 3800 hot rod | garage queen
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PostPosted: Sat Nov 26, 2022 5:12 pm 
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Joined: Wed May 21, 2008 10:17 pm
Posts: 35
Year and Trim: 97 SE, series II, L36, vin K eng. New: Dorman Upr Intake with Ken-Co EGR Sleeve Kit, new LIM (GM Alum. Frame) gasket. Runnin Sweet!
Sorry for the late reply - I've been busy. Check your electrical connections to your coils (clean contacts underneath, and spark plug wires.
Weak CPS (crankshaft position sensor) can cause ignition problems too.
Curious, do you still own the car? lol


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