Question about 1996 Jeep Grand Cherokee
I use one of these spark testers, you can adjust it to different voltage amounts. I belive Auto Zone and Sears sell them, about $20.
Posted on May 25, 2010
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Posted on Jan 02, 2017
The spark intensity is most important .Remove
all plugs to check gap and condition of plugs. The black plug indication will
confirm that the performance is bad whereas a fully fired plug without deposits
must be the ideal view. Check the HT coil and the HT wires, if the intensity is
bad this must be swapped and checked to confirm. DO NOT CHANGE any part without
a confirmation by trying with a replacement from another vehicle or friend.
Finally the LT trigger to the coils must be checked be it from the platinum
points or an electronic ignition unit. The voltage of the trigger must be high
to give the best HT output.
check the voltage to the sections of the coil and ignition unit which if present will confirm the fault on the unit.
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The poor performance of the car makes these faults to come up and undermine the working of the engine.Since the fault comes up when the engine is warm you need to check the ignition and the fuel pump.
check the pressure of the fuel pump when the engine is warm, calibrate if the pressure at the injector is low.
Then we must check with the electrics. The spark intensity is most important .Remove all plugs to check gap and condition of plugs. The black plug indication will confirm that the performance is bad whereas a fully fired plug without deposits must be the ideal view. Check the HT coil and the HT wires, if the intensity is bad this must be swapped and checked to confirm. DO NOT CHANGE any part without a confirmation by trying with a replacement from another vehicle or friend. Finally the LT trigger to the coils must be checked be it from the platinum points or an electronic ignition unit. The voltage of the trigger must be high to give the best HT output.
Sometimes coils can go weak when the insulation heats and so check this out . Also the ignition system can fail when the electronics warm up, if so test for spark.
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