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Have jeep cherokee 1999 4.0 liter engine has code p1391 check engine light on

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Read this from the Jeep owners forum I visit for this type of problem. The sensors referred to are the crank and cam position sensors.
Tripdagoat just posted about his fix..
From the forum: Engine 4.0L
Had a CEL for as long as i've owned my 4.0L ZJ. i was getting code P1391. driving me crazy trying to clear it. replaced both sensors. back probed the entire wiring harness. replaced the entire ignition system. Nothing. So after some advice from a seasoned Jeephave jeep cherokee 1999 4.0 liter engine has code  - icon1.png mech, i replaced the entire distributor. apparently they are prone to wear that is enough to cause the code. It was super easy to do which was nice since i did it in the autozone parking lot to avoid the 75 dollar core charge. the distributor only runs 50 bucks. You will need a phillips head screwdriver to remove the distributor cap and a 1/2" wrench to get the distributor off. Just make sure you pay attention to how the old one comes out and be sure to put the new one in the same way. Long story short, the CEL is finally gone!!! I had searched and searched for the answer to this problem, and from what i can tell NO ONE has tried this to correct the issue. If this works for you, please pass it on to all jeep owners that may have this problem. This would have potential to be a very expensive repair if going at it with no ideas.
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Posted on Nov 06, 2012

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Posted on Jan 02, 2017

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SOURCE: tune up 2000 jeep cherokee 4.0 liter engine

how old are your spark plugs and wires? (miles since changed) If wires and plugs are good , it's probably a problem w/ the fuel injectors.

Posted on Oct 16, 2008

  • 1 Answer

SOURCE: engine light

Take it to any Autozone or Advance Auto. They will check it for free! Probably other similar stores will do the same!

Posted on Jan 15, 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: 2000 jeep grand cherokee 4.0 liter engine timing belt replacement

If you have the same pulley arrangement that most 4.0 engines have that pulley is an idler not a tensioner. Your power steering pump has a pivot bolt, and a slide under the pump. You adjust belt tension using the pump.

Posted on Apr 05, 2009

  • 1071 Answers

SOURCE: 2003 Jeep Grand Cherokee check engine light stays

go to autozone they will check codes for free

Posted on Jul 23, 2009

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