timing - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
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post #1 of (permalink) Old 09-12-2000, 09:31 AM
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timing

89 yj 4.2L stock, 140,000 MILES ON IT I timed it by the book to 9 degrees. with the timing set, 30% of the accelerater travel has alot of valve tapping. I retarded it back to 1-2 degrees BTDC,(this is how is was when I bought it)and it sounds better (no more clicking).
my question is why is the timing no working when set to the factory specs?
I MADE SURE TO PUT THE TIMING LIGHT ON THE CORRECT PLUG WIRE, i ALSO DISCONNECTED THE VACUME ADVANCE AND PLUGGED IT, AND i ALSO DISCONNECTED THE ELECTRICAL CONNECTION ON TOP OF THE VALVE COVER, PLEASE HELP

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post #2 of (permalink) Old 09-12-2000, 09:59 AM
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Re: timing

The vacuum advance may be shot.. the plate or the springs may be sticking. The timing chain or gears may be worn... try the following:

Remove the distributor cap.
Put a socket and rachet on the crankshaft pulley nut.
Note the position of the handle.
Start to manually turn the crankshaft CW with the ratchet.
Have a buddy watch the rotor in the distributor.
As soon as the rotor starts to move STOP moving the crankshaft.
Again, note the postion of the rachet handle.

If the handle has moved more than 6 degrees, then the timing gears/chain should be replaced.

If the rachet handle did not move more than 6 degrees, the problem is likely located in the distributor.

Good Jeepin'

Larry
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