Question about 1999 Jeep Cherokee

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I have a 1999 Jeep cherokee with a 4.0 liter engine. It would not start. There was no check engine light. OBDII check no codes found. I have changed the ignition coil, spark pickup module, and the c

With OBDII I cleared the 1391 code started the car the check engine light is not on. Shut car off started back up. Check engine light back on. I also disconnected ground wire from battery and code 1391 still on. It seems to start and run fine.

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  • Jeep Master
  • 17,970 Answers

Hi there:
It's definately the next logical step since P1391 is for CMP (Camshaft) or CKP (Crankshaft) sensor loss. The cam sensor is available seperately, it's extremely easy to change, you don't even have to pull the distributor. Just take the cap and rotor off then pull the cam sensor out.



Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

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Posted on Nov 06, 2012

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Posted on Jan 02, 2017

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SOURCE: 96 jeep grand cherokee 4.0

change the computer .... PCM get a used one it fixed mine had same problem

Posted on Feb 19, 2009

crayzeetrayn
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SOURCE: 2001 Jeep Grand Cherokee code P1391

I would check to be sure that the timing chain hasn't jumped at all ..

Posted on Mar 25, 2009

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SOURCE: 2005 Jeep Grand Cherokee Limited, 5.7L V8, starter

Every morning at lunch time and evening my jeep won't start. It doesn't grind but the electrical goes crazy. After a couple of trys it finally starts. Help

Posted on Aug 20, 2009

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SOURCE: 1990 Jeep YJ 6 cyc. Won't Start---No Spark From Coil

It would be great if you could find the Ignition Control Module!!! From my experience on my Jeep...90 YJ 4.2 liter carb. it does not have one...Computer controlled only...

Posted on Sep 10, 2009

  • 1 Answer

SOURCE: No spark from ignition module on hot start

95 JEEP WRANGLER 4 CYL

No spark. I have changed out the distributor cap, rotor, wiring from coil to cap, and coil was replaced. I checked the distibutor by turning ignition key and observing the rotor turn. What else can I check. I did not observe a module.

Posted on Sep 18, 2009

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