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Unread 05-16-2010, 03:55 PM   #1
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1988 YJ Wrangler 
Join Date: May 2010
Location: fl
Posts: 104
94 wrangler ignition problems

I have a 94 wrangler 4.0. it seems to start fine, but once its warmed up if i let it idle it dies, i replaced the cap rotor and pick up coil, but its still doing it,while im driving it it acts like i turned the key off for 3 or 4 seconds and then it continues to run, ive ran it with a fuel pressure gauge on it and it doesnt seem to be a fuel problem which is why i changed the pick up cap and rotor. has anyone else had this problem or do you have an opinion on what i should check next.

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Unread 05-16-2010, 04:16 PM   #2
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1994 YJ Wrangler 
Join Date: Jan 2009
Location: Desert Hills, AZ
Posts: 247
It could be one of two things. IAC (Idle Air Control) or the TPS (thottle position Senor). After that I would check the vacuum lines.
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Unread 05-16-2010, 08:32 PM   #3
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1989 YJ Wrangler 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,957
Look in the Faq on checking fault codes. I think you have a bad O2 sensor. Diagnostic Trouble Codes
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