timming or carb help???
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Joined: Dec 2003
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timming or carb help???
ok ive got a 78 f-150 4x4 4speed.
i rebuilt the 351m to stock specs exept for a rvtype cam and edelbrock intake and a 670 truck advenger.
the truck runs great but if you rev it up from idel a few times in will back fire out of the carb slightly, also when going up a sligh grade doing 50mph or so it stumble a little.
can any help me remodie my problem.
thanks matt
i rebuilt the 351m to stock specs exept for a rvtype cam and edelbrock intake and a 670 truck advenger.
the truck runs great but if you rev it up from idel a few times in will back fire out of the carb slightly, also when going up a sligh grade doing 50mph or so it stumble a little.
can any help me remodie my problem.
thanks matt
Senior User
Joined: Feb 2006
Posts: 143
Likes: 0
From: Auburn, WA
Originally Posted by f-4x4
ok ive got a 78 f-150 4x4 4speed.
i rebuilt the 351m to stock specs exept for a rvtype cam and edelbrock intake and a 670 truck advenger.
the truck runs great but if you rev it up from idel a few times in will back fire out of the carb slightly, also when going up a sligh grade doing 50mph or so it stumble a little.
can any help me remodie my problem.
thanks matt
i rebuilt the 351m to stock specs exept for a rvtype cam and edelbrock intake and a 670 truck advenger.
the truck runs great but if you rev it up from idel a few times in will back fire out of the carb slightly, also when going up a sligh grade doing 50mph or so it stumble a little.
can any help me remodie my problem.
thanks matt
Posting Guru
Joined: Mar 2005
Posts: 2,068
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From: western montana
yea- almost like an exhaust valve seating issue...maybe...hopefully not. also check floats and ignition system.
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Elder User
Joined: Aug 2004
Posts: 620
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From: NE Wisconsin
There is a way to check valves with a vacuum guage. Can't remember how, but somebody here probly knows.
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For vacuum gage readings and other information check my web page (click on the spinning wrench) and:
http://www.clubfte.com/users/torque1st/index.html
http://www.users.bigpond.com/ergoff/vac1.htm
For carb help check out the carb forum:
https://www.ford-trucks.com/forums/forum72/
http://www.clubfte.com/users/torque1st/index.html
http://www.users.bigpond.com/ergoff/vac1.htm
For carb help check out the carb forum:
https://www.ford-trucks.com/forums/forum72/