missing and hesitation
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Senior User
Joined: Nov 2003
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missing and hesitation
i have a 77 f350 with a 330 v8,did a valve job and complete tune up,engine idles fine and cruises fine at highway speeds(60 mph at around 3200 rpm),i just returned from a 3000 mile trip with it,it has a petronix electronic ignition setup.
it misses and hesitates between 1200 and 1800 rpm all the time(really bad),you can move the dizzy shaft back and forth very slightly,could this slight movement be causing this problem?
i use the truck local most of the time and need to fix this nagging problem.
it misses and hesitates between 1200 and 1800 rpm all the time(really bad),you can move the dizzy shaft back and forth very slightly,could this slight movement be causing this problem?
i use the truck local most of the time and need to fix this nagging problem.
Cargo Master
Joined: Apr 2004
Posts: 2,574
Likes: 4
From: Golden, CO
Did your mark fluctuate when you set initial timing? If not, I would move on.
I would be looking at the advance mechanism: they gum up, they wear out. I had a really worn (more than slight, lol) shaft that didn't cause problems unless it was subjected to rapid change in RPMs.
If the dizzy/ignition is up to snuff, move on to the carb. That 1200 to 1800 range is pretty narrow.
I would be looking at the advance mechanism: they gum up, they wear out. I had a really worn (more than slight, lol) shaft that didn't cause problems unless it was subjected to rapid change in RPMs.
If the dizzy/ignition is up to snuff, move on to the carb. That 1200 to 1800 range is pretty narrow.
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