Question about 1999 GMC Jimmy

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Jimmy wont start. changed plugs and cables. changed ignition coil and ditributor cap. fuel pump works.

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  • josuemar09 Aug 31, 2010

    I couldn't find the ignition module underneath the distributor but I did find something that looked like the ignition module beside the ignition coil. Might that be it?

  • josuemar09 Aug 31, 2010

    The pictures did not upload. I cannot see them.

  • josuemar09 Sep 08, 2010

    i was not able to fix it. i changed the module and still did not get it started

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3 Answers

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  • GMC Master
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Start from the begining to go over once again.
1. remove all the plugs and check the spark in each of them. check the INTENSITY of the spark, this is important or else the coils must be checked and also the potential of the impulse to the coils.
2. since you have checked the wires and cables we can take a check once again with the plugs attached.
3. Check also the gap of the plug to be uniform.
4. Check the fuel pressure, check the calibration if the engine has done a higher mileage without a check up. check on the fuel filters, the fuel lines, the injectors. make sure that there is no trace of dirt, water or impurities in your fuel if you happened to fill recently at a suburb.
5. make sure that the compression in all the cylinders good , test by cranking to see the pumping pressure.
6. before putting back the plugs make sure there is no overflow of fuel in the cylinder.
Now fit back and start, if faulting check the timing and correct , the car must start now if all the above points were checcked correct.
Or go over once again

Posted on Sep 01, 2010

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  • Master
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The ignition module on your GMC Jimmy controls the ignition spark sequence and firing of the ignition coils.
You have to work from underneath the vehicle and locate the ignition module towards the back of the engine.
If the ignition module checks out then There are some possibilities which you will have to check in this case:--
1) First of all check the power and voltage to the battery. With meter it will show exact 12 volt if the battery is charged. If the voltage is less get the battery charged at local auto repair shop. If the battery is internally drained and not getting charged then its time to replace the battery.
2) When you crank the car do you see spark coming at the spark plug? If no then its time to check the spark plugs and coil pack. If the spark plugs are not worn out and looks new then its time to check coil pack. The spark plug gets power to spark from coil pack.
3) The other thing to check in this case is the starter solenoid of the car. If the battery is charged and you start the car then it gives power to the starter to start the car. But if starter is faulty or not connected properly then car will not start.
4) The other thing to check in this case is fuel in the car. If there is fuel in the car then check the blockages in the fuel pump if the fuel pump looks proper then check the fuel filter above the fuel pump.
5) If all the above possibilities mentioned above checked out OK/perfect then it’s a electrical issue and the wiring's in the car needs to be checked. The car gets power from the battery to get started. so the wires from battery needs to be checked one by one.
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Aug 31, 2010

  • raj somaiya
    raj somaiya Sep 09, 2010

    Check the voltage at battery,the starter and the alternator.There should be 12 volts.Also check voltages at spark plugs and coil pack.There should be 12 volts.You replaced the ignition module.Check the voltage at ignition module for 12 volts,Also get the voltages checked at ignition switch,there should be 12 volts,Its a 12 volt battery power so the voltage at the electrical parts will be near to 12 volts.But if there is no voltage then yes its the problem with that particular part.Get all the electrical parts checked at local car garage,this will confirm where the faulty part is.

    Thanks for keeping updated with your query.

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  • Contributor
  • 33 Answers

Did you check if it has fire from the coil? does the coil have the 12vdc supply? I would think that the next part should be the ignition module in the distributor. not expensive and most likely the proublem.

Posted on Aug 30, 2010

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