check engine code 303 fix?

[awilson]

keep getting a 303 misfire code on my 01 Cherokee Sport 4.0, changed plugs wires, still get code back every 2 weeks, any ideas what else to look for? Thanks

 

[VortecJeep]

According to my alldatadiy subscription, possible causes are:

Misfire intermittent
Other possible causes for misfire
Cam, crank, valve timing, or vacuum problem
Ignition coil output low
Engine mechanical problem
Secondary ignition pattern irregular
Fuel contamination
Fuel pressure leak down out of specification
Fuel pump amperage out of specification
Fuel pump capacity out of specification
Fuel pump pressure out of specification

 

[gt500swim]

if its a cylinder 3 misfire or a cylinder 4 misfire there was a recall from that due to the injectors getting too hot. the way they fixed it is the installed a heat shroud around the injectors. you can get it from the dealership

 

[RenegadeT]

if its a cylinder 3 misfire or a cylinder 4 misfire there was a recall from that due to the injectors getting too hot. the way they fixed it is the installed a heat shroud around the injectors. you can get it from the dealership

is this recall only for the 2000-01 XJ?

 

[gt500swim]

here are the tsb's im aware of: http://www.jeepscanada.com/showthread.php?t=121269

http://www.cherokeeforum.com/f2/01-xj-misfire-cylinder-3-a-42281/