Question about 1988 Chevrolet S-10

5 Answers

88 Chevy S-10 4.3 No spark

It was running fine, went into a store for about 40 minutes, came out and it would crank just fine, but not fire. I came back 3 hours later and it started right up. Ran it until warmed up, turned it off and tried starting it again. It cranked ok but would not fire. I let i cool down for a few hours, came back and tried it again. Same thing, cranked just fine, but wouldn't fire. I put in an ignition module. Same thing, cranks great but wouldn't fire. Had it towed home. Had the new ignition module tested and it showed good, had the old one tested and it also showed good. Replace the coil. (I know they don't often go bad, but what the heck). Same result, cranks great, won't fire. Next I replaced the coil pick up which involved pulling the distributor, knocking out the pin, taking it apart and putting the coil pickup in. I had marked the distributor and rotor positions and put it back in the engine. Same result, cranks great, no spark. I have power to the coil and from the coil to the 2 pronged connection on the new ignition module with the key in the on position. I've checked all the under dash fuses and all are ok. Any ideas? Could it be the computer? Both fuses are good. Also the fuel pump is working and it has gas too. Help please.

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  • Nurse Gary Jul 29, 2008

    How hard is it to test if the ECM is bad. When I check for codes it flashes the 12 and nothing else. Thanks, Gary

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5 Answers

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  • Chevrolet Master
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ECM should flash code 12 three times, this to signal that the computer is responding.After the 3rd time it flashes code 12 if there is any fault code stored, it will blink the code, in this case post here test result.

Posted on Jul 29, 2008

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  • Expert
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I had a similar problem with my car. My friend who happened to have experience changed the spark plugs for me and things turned out fine. Can't exactly see the root of your problem with the posts though so it may or may not work.

Posted on Jul 29, 2008

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  • Master
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Chech the crankshaft sensor. If the crank sesnor is cracked, the crack will expand when it heats up, and can cause it to spark at the wrong time or cause a no spark untill it has cooled down and contracted, pulling the crack back together.

Posted on Jul 28, 2008

  • Ryan Rogers
    Ryan Rogers Jul 29, 2008

    Testing it yourself is a nightmare. I have picked up a few ECM's at salvge yards in the past and taken them to a local Chevy dealer service dept and asked them to test it, and they did for free. They have the equipment and connections for this. Try taking it out and going to a dealer service dept and tell them you picked it up used, you don't know if it's any good, but if you install it you can't return it, and see if they will test it for you. In other words the ol' sob story. It works for me.

  • Ryan Rogers
    Ryan Rogers Aug 02, 2008

    Did you get the ECM tested?

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  • Chevrolet Master
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I think you have spent enough money to realize it's time to take it to a certified GM Tech, it can be any number of things, poor ground connection, faulty Power Train Control Module, I believe it is a Module problem because it sounds heat related. I am sorry I can't give more useful advice but these types of problems require tests that over the internet I can't do. Call me if you like 925-459-0571

Posted on Jul 28, 2008

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  • yadayada
    yadayada Jul 29, 2008

    I doubt you can get this problem solved over the internet, you are throwing parts at this, you could have had a trained GM tech fix this issue by now, I strongly suggest you seek professional help from the dealer

  • yadayada
    yadayada Aug 02, 2008

    12 means "pass" om GM systems, but that doesn't mean that the PCM is working for all systems. There is no real way to test a PCM computer, only years of experiance will tell you that, here is a clue though, the computer is at fault less than 2% of the time, no matter what the make and model.

  • yadayada
    yadayada Aug 02, 2008

    One other comment, have you replaced the distributor rotor, they do burn through now and then, also you may have jumped valve timing, have you checked the valve timing?? to do this pull number one plug, turn the engine, when you feel press at the hole the plug came out of stop and check to see if the crankshaft pulley marks are pointed at or near TDC. Other than these tests I think it may be time to visit the chevy dealer.

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6 Suggested Answers

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SOURCE: 1998 chevrolet k1500 pickup 305 a misfire in # 2 cylinder

hi there, if you can feel the misfire at an idle but not at a higher rpm than the fuel pressure regulator is bad im working on one right now that has mifire code and random misfire codes coming up

Posted on Aug 28, 2008

  • 7 Answers

SOURCE: No spark at spark plugs

You have the wrong pick up coil. It should have plenty of clearence for the shaft. compare it to the old pick up.

Posted on Nov 30, 2008

stephanos18
  • 144 Answers

SOURCE: Replacement of Spark Plug leads, Distributor cap, rotor for T100

I reccommend putting WD40 or CRC on the connections to stop them corroding over time. You also want to make sure the Distributor Cap gasket seals well to keep out water. last make sure you don't get the leads mixed up, best to replace them one at a time. cheers

Posted on May 17, 2009

  • 2002 Answers

SOURCE: 1983 silverado 4x4 spark knock in distributor

Check the timing and make sure the vacuum hose for the advance is not leaking or cracked. Also make sure it is plugged into the front of the carb at the base.
If the timing is dead on and there are a lot of miles on the timing chain, bump the timing ahead 1 or maybe 2 degrees to compensate for chain stretch. That may help.
It could also be that the vacuum advance on the distributor has started leaking and may need to be replaced. You cuold also try a tank ot high test or premium gas. That has been known to get rid of spark knock. Hope this helps.

Posted on May 05, 2010

alicantecoli
  • 21949 Answers

SOURCE: 88 XJ6 Jaguar I accidentally knocked 3 wires off

153624 is the firing order ,or do you mean the low tension wires if so reply to this and i will have a look at my one in the garage tomorrow

Posted on Aug 15, 2010

Testimonial: "Thanks"

  • 2002 Answers

SOURCE: when installing a distributor on a 1985 nissian

With the valve cover off, turn the crank so the timing pointer is at 0. This is Top Dead Center. As you go past this point the exhaust valve should start to open. If it does then insert yout distributor so the rotor lines up with #1 plug location. If the intake starts to open, leave the distributor out and make 1 complete rotation of the crank until the pointer lines up to 0 again. As you go past TDC this time the exhaust should start to open. Now you can put your distributor in. The crankshaft makes 2 turns to every oine turn on the camshaft. Hope this helps.

Posted on Jun 04, 2011

Testimonial: "thanks,that helps alot"

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