94 Cherokee ignition timing

Jun 21, 2008 4 Replies
T

Hi,



I've poked around this and some other groups looking for some info. From what I've read online, it's not possible to change the ignition timing on a 1994 Jeep Cherokee with the 4L engine. I gave the local dealer a call and asked if they could do anything about the pinging (even on high test, it's getting bad). The dealer said turn the distributor. Everything I've read said this will not work.



Does anyone have any ideas what I might try to retard the timing? Or is there something else I should be checking?



thanks,



tom


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J

Might be carbon build up.

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B

Carbon build up is a good possibility. Another thought: Failed or defective knock sensor if the vehicle is equipped with one?

Bob

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S

It shouldn't be pinging. The 4.0 is a crank-triggered electronic engine nanagement system, even though there's a distributor. Causes for pinging include a non-functional knock sensor, EGR not working, overheating, and excessive combustion chamber deposits.

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