Having problems with your 2002 Jeep Grand Cherokee ?

HAVE A 2001 JEEP GC IS NOT RUNNING RIGHT TOOK IT TO ADVANCE, HOOKED IT UP TO THE OBD COMPUTER AND IT GAVE ME THREE CODES PO303 CYL. 3 MISFIRE,PO442 EVAP SYSTEM SMALL LEAK, AND PO455 EVAP EMISSION LARGE LEAK WHAT DO I NEED TO LOOK FOR?

Posted / edited by AnonymousUser on : 24-06-2019

Answers :

Most likely, the P0442 and P0455 are not the causes for your engine problem, they are related to the fuel supply system (check http://www.obd-codes.com/p0442 ).

P0303 is the problem.
First, I'd try to change the spark plugs. If still not OK, I'd try to use an "Fuel system cleaner" or "Injector cleaner". These are some small plastic bottles you can buy at car-parts shops. You need to buy the version according to your engine type (gas or diesel) then use it as stated on the instructions printed on the bottle.

Of course, the problem could be worst, but 90% of the problems are caused by small causes.
Repair Help & Product Troubleshooting for 2002 Jeep Grand Cherokee

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