What do I do to my dist? if:
I have a 88 yj 4.2L carter/5spd/
The timing will stay normal and advance in acceleration as normal off the begining of the drive.
(It runs the best I have ever seen in a long time!, givin it has the carter and stock ignition)
But around aprox10-15 min of driving and running it, the tach will go nuts(waves between 1700 and 5000RPM) above 1500RPM, (the timing seems to jump to max mechanical advance at that speed), it will knock/ping but usually returns to nice idle. when this happens it will run like normal, only up to around 1500RPM.
I tried to slowly rev it up to 1600RPM, it went smooth, up to there then started to knock, lightly. I kept my foot as the same spot and the motor took off knocking exessivly! the tach was in the 4000's, but it was not physically.
What causes the mechanical adanvce to work?, could it jam up?What does the PICK-UP COIL do?
I actually made the worst things about my jeep go away(No hesitation, No missing, No power lack, Perfect idle and runs smooth to redline) , untill this.
-This is not a vacuum advance problem
-This is not an Timing chain/Gear problem
-I performed a computer bypass, of ignition and carb.
If you guys want any more info to make a guess, cause I have no idea what to do, just followup a question or whatever.
I really think it has to be bad to run the engine at 40*advance.
Oh yeah, any suggestion would be great, cause I don't really have 150$ just to toss away for a new one.
Thanks from MATT88YJ
KEEP ON JEEPIN!