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Old 07-17-2013, 11:40 PM
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Ideas for 91 YJ Rough Idle

1991 jeep YJ idle rough. New plugs, wires installed. Distributor good. Sounds like a miss at idle. Not much power on highway and bad gas mileage (200 miles per tank). Any ideas? TPS maybe or bad valve? Except for loss of power on hills and bad gas mileage, seems to run along fine except at idle. Idle seems to be getting worse. Any ideas?
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Old 07-18-2013, 12:43 AM   #2
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O2 maybe

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Old 07-18-2013, 12:56 AM   #3
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Did you check the IAC and TPS?
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Old 07-18-2013, 01:39 AM   #4
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Throwing any codes?
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Old 07-18-2013, 05:52 AM
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Going to check codes today.
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Old 07-18-2013, 06:51 AM   #6
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Is your idle jumping also ? 2.5 or 4.0 ?
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Old 07-18-2013, 07:16 AM
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Its a 2.5 liter base model. Its jumping slightly, only at idle. If you weren't looking at the tack, it would be almost un-noticable.
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Old 07-18-2013, 09:22 AM   #8
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Hmmmmmm ..... I have a problem with my staying up around 1300 after a long drive, after a while it will then drop to around 800 when sitting. What's your resting RPM ?
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Old 07-18-2013, 02:07 PM
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800 rpm. Jumping between 800 and 850 at idle.
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Old 07-26-2013, 11:44 AM   #10
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Ever figure it out ?
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Old 12-09-2013, 05:16 PM   #11
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Quote:
Originally Posted by Maritime Jeep View Post
800 rpm. Jumping between 800 and 850 at idle.
did you ever get this issue resolved? Mine is just starting with the same thing.

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