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My 94 grand Cherokee jeep runs smoothly until it warms up then runs rough and the security light comes on

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  • Jeep Master
  • 20,706 Answers

That is called misfire, (security lamp is 2nd problem)
misfire is bad combustion.
rough driving only or at idle too?
and is the most complex of issues on any car, (engine related)
got tools? or just want a wild guess?
1: get a tune up this decade>?
(and 50 more)

Posted on Apr 13, 2015

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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: 94 jeep grand cherokee will not shift into overdrive

My 97 Jeep Grand Cherokee was doing the same thing. I changed the TPS ( Throttle Position Sensor) Now it is great goes into overdrive fine. It is really easy to change.

Posted on Feb 11, 2009

teezay731
  • 1 Answer

SOURCE: rough idle stalls at low rpm's

check your transmission fluid,the motor will stall when fluid is low

Posted on Mar 24, 2009

  • 1 Answer

SOURCE: 2003 Jeep Grand Cherokee Runs Rough

I had a simalar issue,replaced lower O2 senser and cured it.

Posted on May 20, 2009

  • 1 Answer

SOURCE: security light flashing wont let you start jeep

the alarm seems to be activated. press the button and turn the key.

Posted on Sep 11, 2009

wracefans24
  • 1985 Answers

SOURCE: 1994 GMC Jimmy engine runs rough when cold; smooths out when warm

you need to have the codes checked to know what direction to start repairs,Autozone does this for free

Posted on Jan 20, 2010

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Robert

P.S. in minus 40 i don't even get out of bed... minus 23 here last nite... isn't winter grand

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