Question about 1990 GMC S-15 Jimmy

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Checked spark at coil and the spark tester shows the spark being erratic, will fire sometimes then just dies cannot get a steady spark, possible coil or pick up?

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I would check for a spark leak through the coil wire to the dipstick as it happens comonly. If thats not the problem check the PU coil and module. There are some parts stores that can check the module as there is no self diagnostic for it. The Pick Up coil can be checked with an ohm meeter or mv test if you crank it over while testing it should produce a mv oscilating from positive to negative.


Posted on Nov 16, 2009


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It sounds like the coil is breaking down or the cam sensor may be at fault for the misfiring. Use an inline tester and connect from the coil tower to the spark plug wire to check for a good steady fire. Do this on all coil wires to spark plugs. The best time to do this is at night so you can see it fire. You may want to remove the spark plugs and inspect them for a fouling condition. If all is well then look at the cam sensor for the problem. Hope this will help you.

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i know you said it has fire did you use a spark tester it may have spark but not enough to fire a spark tester
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I put a new starter on my galant,it ran for about 15min. and stop. now itseem like it not getting gas to turn the motor... i didn't hear my fuel pump so i replace it as well, and it still seem to not...


We will definitely want to check the firing order.


Some other misfire issues with this vehicle specifically:

  • Engine is misfiring under load Seems to be switching cylinders.\
    1. Check the spark output to each plug and at different RPMs, make sure there is a consistent spark at all RPMs of at least 1/2 inch, the color should be white/blue. If the spark is weak or is erratic, replace the distributor. It is very common to get defective remanufactured distributors.

    2. Check compression on all cylinders.

    3. Try to add fuel to the engine to see if the misfire goes away. If it does it is a fuel system/injector problem.

  • Scan vehicle for possible injector problems (if problem found do the following)
  • 1. Try swapping the injector with one of the other ones. If the miss follows the injector, replace it. If not, check for leaking valves.

1. Verify that the spark output is OK from each coil. To test one coil pack, remove the two spark plug wires from the spark plugs. Install two adjustable spark testers and set the gap to 1/4 to 1/2 inch on each tester. Start the engine and make sure that the spark can jump across both spark testers at the same time. Test the other coil the same way.
2. Monitor the Crankshaft Position Sensor (CKP) and the Camshaft Position Sensor (CMP) while driving. Both should output a 5 volt square wave signal.
3. Make sure that the fuel trim information is close to 0 on the long-term and the short-term fuel trim. Plus or minus 10% would still be considered normal.

Let me know, if need further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

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2.7 l misfire after changing plugs

From karjunkie:

If the plugs get wet, then you have a spark problem somewhere in the ignition system. Pull a spark plug and hold it against a ground while you turn the engine over. You need to see a fat blue spark. If not, check the distributor, spark plug wires and coils. An easy way to test for spark is with an inexpensive spark tester. This is a device that is readily available at most auto supply stores. If the plugs do not fire properly, check the spark plug wires for fraying or cracking. Next, you need to check the coil(s). If firing voltage is low (weak spark), measure the coil primary and secondary resistance with an ohmmeter. If it is out of specifications, replace the coil. Also, make sure the coil is receiving normal voltage from the PCM or ignition module. If it is low, check the charging system for anything that may be reducing alternator output (battery and alternator cable connections, ground connections and voltage output).

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