Question about 2003 Jeep Grand Cherokee Limited

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I have a 2003 jeep grand cherokee limited. it starts alright but dies almost instantly. when it does stay running it idles rough and at a low rpm. I think it could be the cam sensor but im not sure.

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  • Jeep Master
  • 20,706 Answers

Ever do a tune up this decade?
that is gross misfire
try new spark plugs at the least., or a full tuneup if you like skip those.
its not a vacuum leak this is speed density system.
(try making a leak and see, learn)
there is no mass air flow , its a MAP (speed density uses a mAP
not a maf. (its a JEEP not a FORD)=
suggest , knowing that there are 50 reasons for misfire, Ill not guess.
but in order, (physics) called BASICS

  1. it's bad engine (say lost compression on 2 cylinders)
  2. its bad spark, tuneup time.
  3. bad fueling, last after all fuel is useless on a dead engine and spark.
we do simple tests with simple cheap tools and not GUE$$

a tuneup is not guessing, its required service.

Posted on Dec 15, 2016

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  • Jeep Master
  • 12,494 Answers

Checking for diagnostic trouble codes would be a good first step before assuming anything . Could have a vacuum leak , a Idle air contorl valve problem ,Mass air flow sensor problem, tps -throttle position sensors . A dirty throttle plate . Suggest you check out videos on youtube on rough running ,stalling problems !

Posted on Dec 14, 2016

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