Rough Idle when cold -
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Go Back > Models > Jeep Wrangler Forums > TJ Wrangler Technical Forum > Rough Idle when cold

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Unread 07-28-2008, 03:39 PM   #1
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Join Date: Jan 2006
Location: New Jersey
Posts: 43
Rough Idle when cold

I have a 98 TJ, 4.0/Auto. Jeep would crank but not start. Shows a bad crank position sensor-changed that and jeep starts but runs rough with a miss. Changed the cap,rotor,plugs,wires,still runs rough when cold but does get better once it's warm. Now it throws a code that says the crank and cam aren't in sync'. Once warmed up it throws no code. I'm baffled,please help

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Unread 04-22-2013, 08:25 PM   #2
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1989 YJ Wrangler 
Join Date: Sep 2012
Location: morganton, nc
Posts: 18
my brothers o2 tj does the same thing with the same codes. we have replace the crank sensor, plugs, all the 02 sensors, checked for vacuum leaks, cleaned the throttle body and IAC. Still does it when its a cold start and around 40 degrees ambiet temp. Totaly lost now.
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