98 Grand Cherokee Laredo 4.0 stutter problem?
03-25-2015, 01:34 PM
#1
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Model: Cherokee
98 Grand Cherokee Laredo 4.0 stutter problem?
Hi,
A friend of mine has a 1998 Jeep Grand Cherokee Laredo 4.0 automatic with 135,xxx miles on it. with a weird problem..
Problem - It will start up fine and then start stuttering (RPMS will rise and then go down to near 100) in the first five minutes. It seems to resolve on it's own. It will also do this within the first five minutes of driving at any speed.
Solutions - We've replaced:
- Crankshaft Sensor
- Throttle Position Sensor
- Plugs/Wires/Rotor and Cap
- Cleaned the carbon deposits from the throttle body
- Had fuel pressure tested came back normal
- Coolant Temp Sensor
Outcome - Still seems to stutter intermittently in the first five minutes of idle or driving.
Can someone HELP??!!
Thanks
*******Update - We have found the problem! It was the upstream 02 sensor. Replaced it and the stutter has completely gone away.
A friend of mine has a 1998 Jeep Grand Cherokee Laredo 4.0 automatic with 135,xxx miles on it. with a weird problem..
Problem - It will start up fine and then start stuttering (RPMS will rise and then go down to near 100) in the first five minutes. It seems to resolve on it's own. It will also do this within the first five minutes of driving at any speed.
Solutions - We've replaced:
- Crankshaft Sensor
- Throttle Position Sensor
- Plugs/Wires/Rotor and Cap
- Cleaned the carbon deposits from the throttle body
- Had fuel pressure tested came back normal
- Coolant Temp Sensor
Outcome - Still seems to stutter intermittently in the first five minutes of idle or driving.
Can someone HELP??!!
Thanks
*******Update - We have found the problem! It was the upstream 02 sensor. Replaced it and the stutter has completely gone away.
Last edited by Legwagon; 04-15-2015 at 08:07 AM.
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03-25-2015, 09:27 PM
#8
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Location: Metro Detroit
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Year: 1999
Model: Cherokee
Engine: 4.0
98 Grand Cherokee Laredo 4.0 stutter problem?
I have a similar issue with my XJ, it doesn't quite drop that low though. Clears right up within a few minutes. I'm real curious to see where this goes.
03-26-2015, 11:23 AM
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Ok today we cleaned the IAC and looked at the map hose for cracks, no cracks.
Neither of these fixed the problem.
It actually stalled today for the first time as well.
We have a checklist of things we are checking but nothing seems to fix it.
Does anyone have anymore advice/info about this?
Neither of these fixed the problem.
It actually stalled today for the first time as well.
We have a checklist of things we are checking but nothing seems to fix it.
Does anyone have anymore advice/info about this?
03-26-2015, 12:05 PM
#12
Old fart with a wrench
There is an o-ring under the mounting of the IAC. It may be dried out, cracked or hard. Try replacing it.