Timing Issue?

**William C.** · December 3, 2009, 09:25 AM

Re: Timing Issue?

Possible, if retarded too far.

**Chuck M.** · December 3, 2009, 09:30 AM

Re: Timing Issue?

Thanks Bill. Is there a reason that the timing would change while the carb was off the car? Could it be something else that Im missing?

**Jack H.** · December 3, 2009, 09:34 AM

Re: Timing Issue?

Distributor clamp not fully tightened. If car has A.I.R. might have a vent valve that's getting flakey (after burn through the exhaust vs. bona fide back fire)...

**Tom L.** · December 3, 2009, 09:57 AM

Re: Timing Issue?

Also check the VAC. If it is not functioning properly you will not have the correct advance during low load/normal driving conditions. With a non-functioning VAC you may be up to 18 degrees retarded from spec.

**Mike Z.** · December 3, 2009, 02:28 PM

Re: Timing Issue?

Chuck-
If you did not disturb the distributor when the carb was pulled, and was working properly prior-it is probably not your problem now. I have however, had a similar problem when points went south, so putting in a fresh set of point would not hurt.
What maybe more the situation is the jetting in the carb. Remember, prior to the rebuild, it was probably whorped and leaking extra fuel-you probably compensated for this by installing leaner jets and/or power valve. Now that all is back to specs, the jets you ran before are too lean. Try riching up on the main jets and be sure to check your vacuum, which is probably more than before and install a power valve to work with that vac number-get the Holley performance book for step by step how to do.
Both the points and running too lean of jets will result in the miss fire you describe. Hope this helps.

Mike Zamora
#12455

**Timothy B.** · December 3, 2009, 03:10 PM

Re: Timing Issue?

Charles, How old is the gasoline? Try to run the tank down and add some fresh gas.