cylinder misfire

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Sep 24, 2010 | 08:21 PM

tommyxj2000

Thread Starter

Senior Member

Joined: May 2009

Posts: 887

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From: dingmans Ferry, PA

Year: 99

Model: Cherokee

Engine: 4.0

cylinder misfire

i have a 2000 xj that has a random misfire...originally it was cyl. 3 and 5...then it jumped to 1 and 3...i didnt move the plugs around to see if the misfire followed the plugs... and every now and again it starts up and idles like ****...it sounds like it backfires and to clear it out i have to try to rev it past 2000 rpm once it does that its fine any idea whats going on...i think it might be the crank sensor

Sep 26, 2010 | 09:00 AM

tommyxj2000

Thread Starter

Senior Member

Joined: May 2009

Posts: 887

Likes: 0

From: dingmans Ferry, PA

Year: 99

Model: Cherokee

Engine: 4.0

anyone??

Sep 26, 2010 | 09:06 AM

TrekkerJmm

"CF Moderator"

Joined: Sep 2008

Posts: 3,045

Likes: 3

From: N.J. Shore Area

Year: 1994

Model: Cherokee

Engine: l6 HO

Hi, what engine codes is it throwing...Tj

Sep 26, 2010 | 09:17 AM

beach dude

Junior Member

Joined: Nov 2009

Posts: 54

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From: nj

Year: 2000

Model: Cherokee

Engine: I6 4.0L

it has to do with "heat soak". do a search. something with the exhaust moved and the heat form it causes the fuel to vaporize in the fuel injector line.