Just purchased a 2000 Jeep Cherokee and I think I'm screwed. Check engine code P0303.

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Jan 20, 2014 | 01:00 PM

#31

mitch500

Member

Joined: Jan 2013

Posts: 146

Likes: 0

From: Edmonton,Canada

Model: Cherokee

Engine: 4.0 H.O

I would replace coil pack, put new plugs/ wires in and refresh all the grounds. I had a similar problem, random misfire. One of my plug wires was arcing because they were really old. Replaced the above and it fixed it.

Jan 20, 2014 | 02:20 PM

#32

belvedere

CF Veteran

Joined: Jul 2012

Posts: 1,395

Likes: 1

From: SD

Year: 1998

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by mitch500

I believe he has tried swapping plugs and coils, and it doesn't have plug wires.

Jan 20, 2014 | 04:26 PM

#33

peelman

Junior Member

Joined: Jul 2013

Posts: 40

Likes: 0

From: Great White North

Year: 2000

Model: Cherokee

Engine: 4.0

Had the same code on my 2000 xj 4.0. I noticed once I removed the power wire from the injector there was some corrosion on the injector pins. Once I cleaned that up cleared the code I haven't seen a return for a least three weeks.

* noted you changed the injector, but check for corrosion at the injector plug.

Last edited by peelman; Jan 20, 2014 at 04:29 PM.