Question about 1999 Jeep Wrangler

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Rough running 99 jeep wrangler 4.0L 6 cylinder auto it started running rough and then would die and not restart we have replaced the cam and crank shaft sensors and ran fine then went to store came out and started it and it ran rough again but it is throwing the code for the sensors we just replaced

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  • ksears Jun 27, 2009

    it will run fine for awhile then will start to raddle and ping and thows the same code then when we clear the code it will run fine

  • ksears Jun 28, 2009

    so we did a tune up on this last night cause it need one ran fine for awhile then it started running crappy again we let it sit and idle for awhile and it cleared itself up and was fine and it didn't through a code this time.



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Computers aren't ALWAYS correct. If a code wasn't cleared after the original problem, it will read the same codes off to the diagnostic. I would remove the wire connector to each injector while it's running. If one of them makes no difference THAT is your culprit. Let me know please!

Posted on Jun 27, 2009

  • Dana Newcombe
    Dana Newcombe Jun 27, 2009

    You very well may be shopping for a new engine control module, don't be afraid to go to the salvage yard. Huge savings and these rarely go bad, but I've changed a few. Keep me updated, thanks.



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1 Answer

A rough running Jeep wrangler

cranks ok> / not stated, and is 100% #1 key fact.
ill guess (daft) it cranks OK.
so check fluid levels(oil tops list )
then fuses.we test them.
then scan it.
all modern cars same. deal.

if it dont crank, "my starter is silent or just clicks)
then that be a horse of a different color.
dead battery ? charge system failure,
starter bad?
PRNDL (p/n switches bad )try cranking in neutral yet
my wrangler is 6 speed stick with a clutch switch
that too, is different.
even green battery lugs,.got those?

will not crank
or cranks perfect but will not start
which is it??????????????????????????/

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2000 Jeep Wrangler idels rough cold runs good warm.

Sounds like the Mass Airflow sensor (or MAF).

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What does the auto shut off fuse do? 92 Jeep Wrangler is having start up problems.

The auto shutdown relay in your vehicle is controlled by the computer. If the computer does not see a signal from the crank or cam sensor, it will turn off power to the relay which in turn shuts off power to the fuel and ignition system. Unlike those in many passenger vehicles, it's not connected to an impact sensor. (as jeeps are off road vehicles as well as being transportation, if they had an impact sensor, they would be prone to shutdown when traveling over rough off road terrain)
The fuses to the relay are affected by shorting or overload of any components they serve, or by a problem with the relay itself.

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99 jeep wrangler 4.0 won't start

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Startin and runnin problems

Most common failure is crank sensor. Before running out and buying one, I strongly recommend that you do some further testing. Any decent manual has instructions for testing systems. Also: test both running and after it dies. (while running everything may check out as good) If you have spark when not running, check fuel filter as well!

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1 Answer

99 jeep wrangler

get a 6 cylinder motor drop in this is best gas saver for most vehicles 4 cylinders dont have the ability to push all the weight of a vehicle but runs smoothly
6 cylinders are as i put in words are evenly balanced for everyday use and not gas guzzler either

May 16, 2008 | 1999 Jeep Wrangler

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