94 GC 5.2 Rough idle when cold. - JeepForum.com
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post #1 of 4 Old 11-08-2009, 03:31 PM Thread Starter
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1998 ZJ 
Join Date: Nov 2009
Location: nh
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94 GC 5.2 Rough idle when cold.

My 94 GC with the 5.2L idles rough when cold. It revs a little high, then low, and rough. After it warms up for about a minute it runs fine, will run good. Let it sit for a while, start it up, and it will do it again only for about a minute, then all will be fine.

It just started doing that.

I had recently replaced the fuel pump and filter.



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post #2 of 4 Old 11-08-2009, 07:23 PM
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1996 ZJ 
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i have a 96 with a 5.2L in it, and unfortunately it does the same. i have no idea what it is. and it just started when it started to get cold

96 ZJ 5.2L 4x4, 4.5" Lift, NP231 swap, Beefed Custom Cline front DS, 33" Goodyear Wrangler Duratracs, 15x10 RCX wheels, JKS front and Rear track-bars, Flowmaster 40series, Cobra CB radio, Optima Yellow Top, Snorkel, Rough Country winch mount, Super Winch TS9500, cut fenders, Red Jeep Club #572, Built Not Bought #279
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post #3 of 4 Old 11-08-2009, 11:49 PM
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1993 ZJ 
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My buddy has a 94GC with the 5.2 that does the same weird surging. I'm wondering if its a TPS but that would be all the time, not just when its cold.
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post #4 of 4 Old 11-09-2009, 01:37 AM
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2006 TJ Wrangler 
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Location: Colorado
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First thing most people recommend for rough idle is to clean the Idle Air Control. The IAC is on the throttle body, it is easy to disassemble and clean. Someone posted step by step, if you search it is easy to find. Or, just click here: http://www.jeepforum.com/forum/f13/h...-valve-756934/

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