shutting off after 5 min of idle - 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 09-07-2007, 06:30 PM   #1
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Default shutting off after 5 min of idle

Problem...when 92 ssei is idling for aprx 5 min, the engine will shut off. When you let is cool down for another 2 min aprox it will start up again. It will run again for a few min again and then will shut off again. When it shuts off and you try to turn the key to start, it justs cranks only....engine does not attempt to start. It is dead!!

Based on the above, I just changed the cam sensor, crank sensor, timing chain and magnet on sprocke for cam sensor. Repair some frayed and shorting wires from module to connects going to ECM (i think). Put it together and bamb...same stuff as above.

Have error codes 18 and 58.

18 cam and crank sensors (both are new)
58 theft system. Do you think it is my keys or the signal from my keys??

Thanks for any advice!!!!
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Old 09-07-2007, 08:01 PM   #2
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Ignore code 58. It'* a known bug in the 92 PCM. And the security key (VATS) will not kill an engine already running.

If both your cam and crank sensors are new and you can ASSUME they are good, you need to carefully inspect the wiring between them and the ICM, the quick-disconnect for that harness next to the alternator, and the connection at the ICM. The ICM itself can cause this, so swapping in a known good spare from the wrecker would be good, or hooking up with a local member.

Have you disconnected the battery for 20 minutes to clear the codes and verified that the code 18 is still present? Your problem sounds similar to an overheating fuel pump to me. Or an ICM heating up......something to think about.

Being that you're in the TO area, we probably have ample help and support in your area if you need it.
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Old 09-07-2007, 11:48 PM   #3
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I will try the ICM change. Is this the module under the spark plud coils? That is my next change. As for the fuel pump overheating, how would i test this? Connecting postive from the battery to the pump jumper next to the battery?
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Old 09-08-2007, 12:05 AM   #4
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The easiest way to test the fuel pump is with a pressure gauge.

Yes, the ICM is beneath the coils. You'll need a 5.5mm for the coils, and a 10mm for the ICM.
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Old 09-08-2007, 01:28 PM   #5
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willwren
I changed the ICM, still the same problem (with a good ICM). I adjusted the crank sensor w/ a vernier and code 18 has been cleared up. But the car still shuts off after 3 to 5 min of idle. I am working on the fuel pump pressure check that you suggested.

As for code 58 that still shows....I have a cheep code reader and in the manual the code 58 in this books says the theft system or transmition temp sensor or transmition wire short. From what I have read on this forum, if the car is running it should not shut off due to theft system (key resistor). So my next check is the trans sensor. Where is this, and how may sensors are there? (under the throttle body in front of the engine where the ABS pump is???)

Thanks again. I am getting close, I do not want to give up now!!!!!
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Old 09-08-2007, 01:32 PM   #6
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Your code reader is wrong on the description. Check Techinfo for the correct code description for your car.

58 is to be IGNORED on a 92. It means nothing, and is a known bug in the PCM. Code 58, if it were REAL, would not shut off a car already running.

Use a fuel pressure gauge on the fuel rail test port under the black plastic cap. We would like you to report the following:

1. Ignition on (no start) for 2 seconds, then off, and repeat for a total of three 2-second 'prime' times. What is the pressure? How fast does it bleed down 10psi from that value?

2. Idle. What'* the pressure?

3. Idle with the vacuum line pulled off the FPR. What'* the pressure?

After that, leave the fuel pressure gauge connected and watch it until the car dies. What does the pressure drop to just before, during, and after it dies?
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Old 09-08-2007, 01:50 PM   #7
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Hi willwren, will do the 3 test, but what is the vacuum line pulled off the FPR?
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Old 09-08-2007, 02:14 PM   #8
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The fuel pressure regulator is plugged into your fuel rail. It'* the 1.5" diameter cylinder with the vacuum line on it.

By disconnecting that line at idle, you're simulating engine load on the FPR. I would expect to see fuel pressure rise at that point.

The tests above should be repeated after the car stalls out.
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Old 09-08-2007, 03:19 PM   #9
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you could start with checking continuity between the cam and crank sensor pins to the icm. and then from the icm to the pcm.

i have a service manual, it says to test the ba12 pin. this is the smaller of the black plugs. with a volt meter, you should see approximately 5 volts. this is with key on eng off. doyou have that?
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Old 09-08-2007, 03:31 PM   #10
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from personal experiance, i would think this to be a crank sensor circuit problem , rather than the cam sensor. i had loss of cam signal on my 92 p/a and it never shut off. the mpg was affected a lil. but not much. i had to drive it home from traverse city (about 5hours) and still got 24 mpg.

also if it was cam sensor circuit, you should get acode 41 as well.
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