'92 4.0L misfiring badly when clutch is depressed - JeepForum.com
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Unread 03-12-2013, 12:48 AM   #1
wellsdave
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1992 YJ Wrangler 
 
Join Date: Jul 2012
Posts: 7
'92 4.0L misfiring badly when clutch is depressed

I just finished putting in a new clutch on my '92 Jeep wrangler YJ. It's a 4.0L with a 5 speed manual tranny. Ran it around the block the first time and all was good. Ran it around the block a second time and it started misfiring badly. Stopped, took it out of gear and released the clutch pedal and the mis-firing stopped and the idle smoothed out. Pushed the clutch pedal back in and it started mis-firing badly. Also, installed (prior) new plugs, wires, dist. cap and rotor. Idles great! revving it up w/o clutch disengaged sounds great. With clutch pedal in hard to keep running/mis-firing.
Any ideas?
Help.....


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Unread 03-12-2013, 10:49 AM   #2
laybackman
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1995 YJ Wrangler 
 
Join Date: Dec 2002
Location: Massachusetts
Posts: 6,130
Quote:
Originally Posted by wellsdave View Post
I just finished putting in a new clutch on my '92 Jeep wrangler YJ. It's a 4.0L with a 5 speed manual tranny. Ran it around the block the first time and all was good. Ran it around the block a second time and it started misfiring badly. Stopped, took it out of gear and released the clutch pedal and the mis-firing stopped and the idle smoothed out. Pushed the clutch pedal back in and it started mis-firing badly. Also, installed (prior) new plugs, wires, dist. cap and rotor. Idles great! revving it up w/o clutch disengaged sounds great. With clutch pedal in hard to keep running/mis-firing.
Any ideas?
Help.....
Check your wiring for your O2 sensor OR any wiring that travels anywhere near your clutch linkage or exhaust manifold like possibly the VSS wiring.
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Unread 03-12-2013, 12:19 PM   #3
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,013
X2 the O2 sensor and VSS! Does it change as the engine warms up? When it is cold it doesn't use the O2 sensor so if your drive around the block is enough to let it warm up and go into closed loop and use the O2 sensor and the syptoms change then definitely the O2. The VSS is pretty consistent and it could be it shorting.
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