post #1 of Old 10-05-2013, 10:49 AM Thread Starter
Why J?
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The 99 XJ 4.0l, auto 144.000 miles. Just bought it 4 days ago. Wife was driving and it died in the neighborhood. She had trouble getting it started but was able to and got it home. Then no start.

Fuel pump primes and I have pressure at the rail. I tested the CPS and it appears to be good.

Switched relays around no change Tested all fuses. None blown.

It appears to have no spark.

I am thinking CPS is bad even thought it tested good or possibly the coil.

Help me please.

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post #2 of Old 10-05-2013, 11:03 AM
offroadfreak69
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Check your power to the CPS
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post #3 of Old 10-05-2013, 11:11 AM Thread Starter
Why J?
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Quote:
Originally Posted by offroadfreak69 View Post
Check your power to the CPS
What would cause that to not be good?
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post #4 of Old 10-05-2013, 11:12 AM Thread Starter
Why J?
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Quote:
Originally Posted by offroadfreak69 View Post
Check your power to the CPS
What would cause that to not be good?

And how?
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post #5 of Old 10-05-2013, 06:02 PM Thread Starter
Why J?
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No one has any other ideas here? Advice?

I'm struggling here.
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post #6 of Old 10-05-2013, 06:21 PM
tjwalker
It's the crank sensor!
 
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Crank sensor and ignition coil are primary suspects. In that order.

Testing of the crank sensor CAN be inconclusive. If you buy a new crank sensor, buy a Mopar unit directly from Jeep for the best reliability. Aftermarket units are very "hit and miss" with a lot of miss!

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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post #7 of Old 10-05-2013, 06:40 PM Thread Starter
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Quote:
Originally Posted by tjwalker
Crank sensor and ignition coil are primary suspects. In that order. Testing of the crank sensor CAN be inconclusive. If you buy a new crank sensor, buy a Mopar unit directly from Jeep for the best reliability. Aftermarket units are very "hit and miss" with a lot of miss!
I picked up both the CPS and coil from my local dealer this afternoon. Just left the UT - Georgia game and plan to put the CPS in and then the Coil. If that doesn't work. I don't have a game plan past that.
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post #8 of Old 10-05-2013, 07:03 PM Thread Starter
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So I get home and just for fun I crank it. No start. Then I try to cycle the key 3 times to see if maybe I can pull a code. Nope. Then I crank it. It starts runs for 30 seconds perfectly then shuts down. Back to no start.
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post #9 of Old 10-05-2013, 08:41 PM Thread Starter
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Replaced CPS and she is a running! Better than ever as a matter of fact. Going out for a test drive should be good to go.
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post #10 of Old 10-06-2013, 06:42 AM Thread Starter
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I wanted to add that my bad CPS tested good for others that experience this problem
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post #11 of Old 10-06-2013, 08:10 AM
bucklee00
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So the CPs fixed it? Our Cherokee is doing the same thing!
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post #12 of Old 10-06-2013, 08:28 AM Thread Starter
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So the CPs fixed it? Our Cherokee is doing the same thing!
It sure did. I was doubtful it would because mine tested good.

Got the Mopar CPS for $75 from the local dealer.
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post #13 of Old 10-06-2013, 09:32 AM
bill7987
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Check ur coil mine did this when I first got mine and I just popped the plugs off and cleaned the corroded connections and she fired right up.
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