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Unread 06-26-2013, 08:20 AM   #1
Wrangler11
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1994 YJ Wrangler 
 
Join Date: Feb 2006
Location: Chicago, IL
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Ruff idle when cold

The last few days my jeep has been idling really rough. The rpms are fine it just feels really rough and hesitant. I thought maybe it was misfiring but it doesn't happen all the time. Any ideas?

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1991 Jeep Wrangler 4.0l auto
1995 Ford F350 Crew cab 7.5l

Previous Jeeps
2002 TJ, 1995 YJ, 2 1994 YJ, 1978 CJ7, 1970 CJ1, 2008 Grand Cherokee, 1997 Grand Cherokee, 1994 Cherokee, 1988 Comanchee
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Unread 06-26-2013, 10:04 AM   #2
superj
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could be just plugs need checking or something in the ignition system is wearing out
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Unread 06-26-2013, 10:10 AM   #3
Wrangler11
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Quote:
Originally Posted by superj
could be just plugs need checking or something in the ignition system is wearing out
I guess ill put new plugs and wires in and see if it helps. Any suggestions on wires and plugs?

http://www.quadratec.com/products/55112_305X_PG.htm
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1991 Jeep Wrangler 4.0l auto
1995 Ford F350 Crew cab 7.5l

Previous Jeeps
2002 TJ, 1995 YJ, 2 1994 YJ, 1978 CJ7, 1970 CJ1, 2008 Grand Cherokee, 1997 Grand Cherokee, 1994 Cherokee, 1988 Comanchee
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Unread 06-26-2013, 10:15 AM   #4
Wrangler11
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http://www.quadratec.com/products/17610_60X_PG.htm
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1991 Jeep Wrangler 4.0l auto
1995 Ford F350 Crew cab 7.5l

Previous Jeeps
2002 TJ, 1995 YJ, 2 1994 YJ, 1978 CJ7, 1970 CJ1, 2008 Grand Cherokee, 1997 Grand Cherokee, 1994 Cherokee, 1988 Comanchee
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Unread 06-26-2013, 11:31 AM   #5
VenomousMaximus
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1992 YJ Wrangler 
 
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Location: San Antonio, Texas
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Check for vacuum leaks..... You can spray Carb / Intake cleaner around the Plenum.... A vacuum leak can cause rough idle or misfire and hesitation
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Unread 06-26-2013, 01:46 PM   #6
UZI4U
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1993 YJ Wrangler 
 
Join Date: Aug 2011
Location: Black Hills, Daschle & Herseth-free SD
Posts: 502
Go buy a new TB gasket and a can of carb cleaner. Take off your TB and hose it out until it looks new. Reinstall with a new gasket. That takes care of 99% of the rough idle problems I have with my YJ and the wife's WJ.
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Unread 06-26-2013, 01:54 PM   #7
Wrangler11
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I do hear a whistle. Maybe there is a leak. I think I have some throttle body cleaner at home. Ill have to check.
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1991 Jeep Wrangler 4.0l auto
1995 Ford F350 Crew cab 7.5l

Previous Jeeps
2002 TJ, 1995 YJ, 2 1994 YJ, 1978 CJ7, 1970 CJ1, 2008 Grand Cherokee, 1997 Grand Cherokee, 1994 Cherokee, 1988 Comanchee
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Unread 07-03-2013, 02:15 PM   #8
Wrangler11
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I a treatment with seafoam and it seems

To have corrected the problem. I'd still like to
clean the throttle body when I have a chance.
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1991 Jeep Wrangler 4.0l auto
1995 Ford F350 Crew cab 7.5l

Previous Jeeps
2002 TJ, 1995 YJ, 2 1994 YJ, 1978 CJ7, 1970 CJ1, 2008 Grand Cherokee, 1997 Grand Cherokee, 1994 Cherokee, 1988 Comanchee
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