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1999 Other Jeep Models No spark

Tiny
MAVERICKDAZ
  • MEMBER
  • 1999 JEEP
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 100,000 MILES
I have a 1999 Jeep Grand Cherokee. It cranks but does not start. The fuses look good, leads and plugs are fine. Distributor turns but not recieving any spark. It has just been serviced and only travelled 150 miles since service. I went to start it one morning to go to work and no spark!
Please help, its my pride and joy
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Monday, May 31st, 2010 AT 1:51 AM

11 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Make sure the coil is getting +12v to it on one side with key on and other side flashes when cranking it. If you have a noid light put it in the two wires in the connector and crank. Light shoudl flash. What do you find?
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Tuesday, June 1st, 2010 AT 11:40 AM
Tiny
MAVERICKDAZ
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  • 6 POSTS
Thanks blackop555
Yes I get 12v with the key on and the light flashes with the light connected.
I cant work it out, I only just had it serviced. Im dumbfounded, please help :(
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Tuesday, June 1st, 2010 AT 6:05 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Ok so you should be getting everything to the coil to provide a spark. Next step is to check for spark out of the coil. Take a spark plug wire and hook to coil then put in a spark tester or ground out a spark plug. Should have bright blue spark there. So do you have spark coming out of the coil or nothing
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Wednesday, June 2nd, 2010 AT 9:51 AM
Tiny
MAVERICKDAZ
  • MEMBER
  • 6 POSTS
I have used a spark plug tester and I have plenty of spark coming from the coil. You seem to know what you're talking about. I really hope you can help

Whats next? :)
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Wednesday, June 2nd, 2010 AT 6:17 PM
Tiny
BLACKOP555
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Bright and blue spark I hope?

Ok so now we know that is good take and measure resistance from the top of the distributor cap tower where coil wire hooks to it and the button on the inside that contacts the rotor. Should be very low resistance. Also make sure your coil wire that goes from coil to the distributor isnt damaged. Measure the ohms across it and twist it all over and see if you can cause it to read open that would indicate a bad wire. If thats all good then your definetely getting spark into the distributor.

Next make sure the tab on the rotor on the end is in good shape and not melted and also make sure that the part that contacts the distributor button is bent up and springy so it makes good contact on the distributor cap to distribute the spark.

If all that is in good shape put #1 cylinder in tdc of the compression stroke and make sure the rotor is pointing at the #1 coil wire. Get back to me with what you find
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Wednesday, June 2nd, 2010 AT 10:57 PM
Tiny
MAVERICKDAZ
  • MEMBER
  • 6 POSTS
The coil looks ok and all readings are within range. The wires look in good condition and I am getting spark to the dizzy.
Everything seems to have good contact and spark
Dizzy, coil, plugs and leads all seem ok
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Thursday, June 3rd, 2010 AT 6:13 PM
Tiny
BLACKOP555
  • MECHANIC
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But your still not getting spark out of the distributor to any cylinders?
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Friday, June 4th, 2010 AT 6:37 PM
Tiny
MAVERICKDAZ
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Correct! No spark to cylinders
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Sunday, June 6th, 2010 AT 5:59 PM
Tiny
BLACKOP555
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Have you checked to see yet if the distributor rotor is pointing at the #1 cylinder with #1 in tdc?
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Sunday, June 6th, 2010 AT 11:07 PM
Tiny
MAVERICKDAZ
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Yes the rotar is pointing at the #1 cylinder with #1 in the dizzy cap
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Sunday, June 6th, 2010 AT 11:10 PM
Tiny
BLACKOP555
  • MECHANIC
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Check spark one more time and make sure that spark tester is all grounded out. Do it for all cylinders. Do you notice bright blue spark on all.

With cylinder in tdc at #1 and rotor pointing at #1 put cap back on and measure resistance from #1 spark plug wire at the spark plug and measure resistance at the other end of the coil wire right at the coil. What resistance do you get. Should be around 20k ohms or less. If you get ol theres no electrical connection try turning engine back and forth and see if you get anything
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Tuesday, June 8th, 2010 AT 9:35 PM

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