Question about 1999 Jeep Grand Cherokee

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It turns off and shakes at the stop light - 1999 Jeep Grand Cherokee

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  • Waldo Fujie Apr 18, 2014

    My first guess is the "flywheel sensor" is going bad. Also, might be good idea to have mwechanic check fuel pressure and/or fuel injectors.

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  • Jeep Master
  • 20,706 Answers

Which engine, ??? we can not guess this. ever. nor help well.

6 engines used. world wide. just a tiny clue here, size matters.


stalls at stop lights.
1: needs a tune up? spark plugs?
2: if rpm is lower than 800 RPM hot, (A/c off) then the idle controls are failing. that is caused by many things, ask.

Is the CEL lamp glowing running, I bet it is, and if it is, that means
SCAN IT. Scan it and see the errors. DTC errors.
anyone can rent a scan tool, or get help, scanning it.

if car has an EGR valve, it can stick open and stall at every traffic light. so can sticking ISC motor (idle speed controller)
many jeep engine have no EGR, its done with fancy cam timing.
i cant speak for all 6 engines at once, so do post engine, size.
or its all just guessing....
more guesses. too high fuel pressure.
leaking injectors
dead clogged injectors.
ECT stuck at -40F
thermostat (coolant) stuck open. flooding, and fouling sparks plugs.
and 25 more. ask.
or scan it. and tell engine size.

Posted on Apr 17, 2014

  • 1 more comment 
  • webslinger32
    webslinger32 Apr 17, 2014

    could be a lil water in gas tank try a bottle of heet gasline anti freeze, and try some stp fuel treatment to clean injectors also egr or tps could cause these problems. sparkplugs , sp wires go to advance auto they have a code scanner to use for free , it comes in handy hope this helps ya good luck let us know cya l8r

  • _-__-___-_
    _-__-___-_ Apr 17, 2014

    bad fuel , leaking injectors. (learn to read SP tips.) but no engine stated. so.... weak answers. never post engine quesitons, with no engine stated. or its all just (basics)

  • _-__-___-_
    _-__-___-_ Apr 17, 2014

    heck they even have 3.1 L Diesel , engines, with NO Spark, dig?

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