Question about 1992 Chevrolet S-10

6 Answers

My 92 S10 5 speed with a 2.8 starts up fine on a cold start but when it has run for even a few minutes and you turn it off it won't start back up until it cools down. What could be the problem?

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  • 3 more comments 
  • George A
    George A May 03, 2015

    When the engine is warm or hot, it will crank but has no spark or fuel coming out of the TBI injectors and it won't start again until about an hour or so of letting it cool down

  • paulmacintyre
    paulmacintyre May 03, 2015

    Given that info.... It may not be an ignition module. When it doesn't start,will the check engine light come on for a bulb check? It may may be an internal PCM issue

  • paulmacintyre
    paulmacintyre May 03, 2015

    Upon further looking at your issue George, it does look as if it is an ignition module issue. This module supplies the computer with info for injector firing as well as spark. I would feel confident in replacing this module and having your issue corrected

  • Karl Whisenand
    Karl Whisenand May 04, 2015

    pour water over the module if its mounted in the engine compartment to cool it

  • George A
    George A May 05, 2015

    Yeah the ICM was the issue thanks paulmacintyre

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6 Answers

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  • Master
  • 1,554 Answers

Some guesses for you ......
It's possible for a clogged fuel inlet line to cause a vapor lock condition because it causes the gasoline to be placed under a high vacuum.
Of course, the solution is to change the fuel filter and check the fuel lines for damage or being crushed out of shape.
My favorite remedy is to check the fuel tank cap. If it's a vented cap and the vents are clogged, then vapor lock is a possible result. Poor gasoline is a cause for some vapor lock

check the return tank canister purge valve.

try a stronger battery.

see if its gas starved pour about 2 oz down the wingnut center of carb an see if it starts

Posted on May 03, 2015

  • George A
    George A May 03, 2015

    Yeah that's what I was thinking too but I tried using starting fluid and it didn't work, I checked for spark and there was no spark

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  • Chevrolet Master
  • 3,218 Answers

I agree with Stephen.... Try swapping out ignition module

Posted on May 03, 2015

  • George A
    George A May 03, 2015

    Yeah I'll swap it out hopefully today, I need to out heat sink compound on the new module right? And if that's not the issue it's probably the pickup coil right?

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  • Chevrolet Master
  • 21,873 Answers

With no spark or injector pulse, my first guess would be the ignition module. Swapping the module with a new one may be the only way to find out. You may be able to take it out and get it tested, but I doubt a problem will show up if it is cold. A shop manual would have a flow chart with test procedures.

Posted on May 03, 2015

  • 6 more comments 
  • George A
    George A May 03, 2015

    That's what I was thinking too. Either that or the pickup coil. I will change out the module as soon as I can and see what happens. I've tried changing the ignition coil, cleaning the MAP sensor and cleaning the posts on the distributor cap and the spark plugs don't look too bad, when I took the rotor off in the distributor I noticed some white specs of dust on the ICM and blew it off and made sure it was connected well but like I said I'll swap out that module probably tomorrow

  •  Stephen
    Stephen May 03, 2015

    The coil and ignition module are the two most common faults on a GM product. Fords and Chryslers have a relay that can fail, but I'm not aware of a relay for most GM vehicles. I would make sure the coil and injectors have power so you know you are looking for something on the secondary side of the circuits. The module signals the ECM for when to fire the coil and the injectors by providing the ground circuit to those components.

  •  Stephen
    Stephen May 03, 2015

    GM has a history of low quality engine computers, but hopefully yours is not one of them.

  • George A
    George A May 03, 2015

    Yeah hopefully it's just that ICM. I'll try to buy it today and put it on, I've heard from some forums though that I need to put heat sink compound on the module, is that true?

  •  Stephen
    Stephen May 03, 2015

    Yes the compound usually comes with the new module.

  • George A
    George A May 03, 2015

    Okay that's good, I'll go buy the module now and put it on, I just take the old one off and put an even amount of compound on the new one right?

  • George A
    George A May 04, 2015

    Hey I put the new module on the truck, starts great now regardless of how long I wait to restart it. Thanks for the help man I really appreciate it

  •  Stephen
    Stephen May 05, 2015

    Glad you got it fixed. Sometimes we hit a home run, sometimes not. I'm often amazed at the number of people who offer fixes after the problem is solved.

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  • Chevrolet Master
  • 14,585 Answers

Replace the starter.

Posted on May 05, 2015

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  • Chevrolet Master
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I had that, I thought it was due to loose wire connections in the distributor and on the coil.

Posted on May 03, 2015

  • George A
    George A May 03, 2015

    Yeah I tried securing all the connections, it didn't help much

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  • Contributor
  • 42 Answers

May have a cracked distributor cap

Posted on May 03, 2015

  • George A
    George A May 03, 2015

    It didn't look cracked when I took it off

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SOURCE: 1999 4.0L Jeep Grand Cherokee shuts down after 20-30 minutes.

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Posted on Feb 01, 2009

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SOURCE: rodeo won't start after driving until it cools down

it's probably a fuel injection problem. the seals wear or get some little bit of junk in seal surface and are unable to completely close. it's not a problem as long as the engine is running, the seals let in a little more fuel and the computer adjusts for it. after you shut it off the leaky seals let the fuel into the cylinders and then if you try to start it up it is for all intents and purposes a flooded engine. if you don't try to start it again for a good while the fuel that leaked into the cylinders evaporates or runs down into your oil pan. anyway, it's not there and so your engine is not flooded and it starts like it's supposed to. obviously i haven't looked at your vehicle and that's just a guess but it's based on vehicles i have seen. hope that helps

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