1998 Jeep Grand Cherokee no spark from ignition coil

Tiny
HEARTLANDCHRIS
  • MEMBER
  • 1998 JEEP GRAND CHEROKEE
  • 4.0L
  • V6
  • 4WD
  • AUTOMATIC
  • 143,000 MILES
I've changed the ignition coil, the crankshaft sensor, computer ( junk yard part ). With no resolve I cant get any spark and when I turn the key to the on position the gauges don't work either. I am really stumped don't know where to turn now. Please help
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Sunday, August 10th, 2014 AT 1:58 PM

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Tiny
CARADIODOC
  • EXPERT
If we are to assume the two things are related, a good suspect would be the ignition switch or its connector terminals. For starters, pop the trim covers off and look at the connector for signs of melting and the terminals to see if two are black or discolored.
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Sunday, August 10th, 2014 AT 8:52 PM
Tiny
HEARTLANDCHRIS
  • MEMBER
Sorry I should have been more specific. I don't have coil packs, I have a distributor. Which I also changed. I did look at my coil connector it looks perfectly fine though. I tested my connector but got nothing from it. How am I losing my spark I'm changing everything I should. Relays fuses sensors. I'm exhausted at this point. I noticed you had mentioned something about the ignition. Would that cause my ignition coil to lose spark?
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Monday, August 11th, 2014 AT 12:07 AM
Tiny
CARADIODOC
  • EXPERT
How did we get to the ignition coil? I'm getting confused because I just posted an answer that did relate to that. You have the additional symptom of dead gauges. That points to something other than the common loss of spark, and the likely suspect is the ignition switch or its wiring. One clue to listen for is the hum of the fuel pump. You should hear it run for one second after turning on the ignition switch. If you don't, there's a power supply problem and it's most likely related to all of these things.

If you DO hear the pump run for one second, we know the automatic shutdown (ASD) relay is turning on. It must turn on again during engine rotation, (cranking or running). To test for that, measure the voltage feeding the ignition coil positive terminal, any injector, or either smaller terminal on the back of the alternator. You should find 12 volts there for that first one second, then again during cranking. On the cars that's a dark green / orange wire. I'm not sure if it's the same on Jeeps. The wire you're after will be the same color at all the points I mentioned.
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Monday, August 11th, 2014 AT 12:49 AM

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