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Engine on it has a very unsteady idle.

Tiny
IXY2
  • MEMBER
  • 1990 JEEP CHEROKEE
  • 210 MILES
I have a 1990 Jeep Cherokee Larado, 4 speed automatic, with a I6 4.0 engine.
It starts fine, runs great at speed. But when I come to a stop with the engine on it has a very unsteady idle. It feels like its missing, but the lurches it makes are completely random. It can do it 20 times in arrow before returning to a normal idle or once. My Question to you is, Do you know whats causing this fault.

I just replaced the fuel filter spark plugs and put fuel injection cleaner in the tank, these replacements did not help.
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Monday, January 30th, 2012 AT 12:32 AM

3 Replies

Tiny
IXY2
  • MEMBER
  • 3 POSTS
I have a 1990 Jeep Cherokee Larado, 4 speed automatic, with a I6 4.0 engine.
It starts fine, runs great at speed. But when I come to a stop with the engine on it has a very unstedy idle. It feels like its missing, but the lurches it makes are come pleatly random.
It can do it 20 times in arrow befor retuning to a nomal idle or once. My Question to you is, Do you know whats causing this fault.
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Monday, January 30th, 2012 AT 12:36 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,740 POSTS
Start with checking the idle air control valve and check for vacuum leaks.
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Monday, January 30th, 2012 AT 12:56 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Clean the idle air control valve and EGR valve and see what happens-also test the TPS closed/WOT voltages
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Monday, January 30th, 2012 AT 12:57 AM

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