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Jon
Jon, ASE Certified Technician
Category: Jeep
Satisfied Customers: 310
Experience:  Master Chrysler/Jeep/Dodge Tech
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1998 Jeep Cherokee 4.0L Codes p0300, p0302, p0305 Multiple

Customer Question

1998 Jeep Cherokee 4.0L
Codes p0300, p0302, p0305
Multiple misfires cyl. 2 &5
Only happens at operating temperature
New plugs, wires, cap, rotor, and crankshaft position sensor
Any ideas
Submitted: 1 year ago.
Category: Jeep
Expert:  Jon replied 1 year ago.

Hi, has anyone set the sync signal with a scan tool? It involves moving the distributor like setting ignition timing to set it but you need a scan tool capable of running the set sync function.

Customer: replied 1 year ago.
I thought that was set at the factory and not to be messed with.
Expert:  Jon replied 1 year ago.

No, there's a function in a scan tool to set it. You want to get it as close to 0 degrees as possible when using the set sync signal function.

Expert:  Jon replied 1 year ago.

It's not ignition timing like an older distributor adjustment, just the sync between the cam and crank sensors.

Customer: replied 1 year ago.
Is this best done by a dealer or my Jeep mechanic, how much $? Or is it worth it to buy the tool and do it myself?
Expert:  Jon replied 1 year ago.

A half decent aftermarket scanner should be capable of doing it. It should be an an hour labor max, it takes about 5 minutes. If it is at +/-10 degrees now, it could be the cause of the misfire. Idk if it's worth you buying a scanner that can do it. I'd guess you'd be lucky if you could find a used one for 500 that's capable of doing it.

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