'78 351M Choke adjust?
Laughing Gas
Joined: Dec 2000
Posts: 781
Likes: 18
From: East Texas
'78 351M Choke adjust?
weldman,
The fast idle cam adjustment is on the passenger side slightly to the rear and behind the black choke housing franklin mentioned. There will be a small bracket with a couple of detents and an arm with a peg from the butterfly plate. When working correctly the peg will position on one of the detents for fast idle operation when cold. I say when working correctly because the carb on mine is a rebuilt one I put on three years ago and I've never got it working correctly. Maybe I'm missing something (or perhaps my real mechanical ability is showing). It's difficult to describe the assembly, so maybe some of the other posters can correct anything I've gotten wrong.
Jason
1993 F-150 300 I-6/5-Spd.
1977 F-250 351M/4-Spd.
The fast idle cam adjustment is on the passenger side slightly to the rear and behind the black choke housing franklin mentioned. There will be a small bracket with a couple of detents and an arm with a peg from the butterfly plate. When working correctly the peg will position on one of the detents for fast idle operation when cold. I say when working correctly because the carb on mine is a rebuilt one I put on three years ago and I've never got it working correctly. Maybe I'm missing something (or perhaps my real mechanical ability is showing). It's difficult to describe the assembly, so maybe some of the other posters can correct anything I've gotten wrong.
Jason
1993 F-150 300 I-6/5-Spd.
1977 F-250 351M/4-Spd.
Thread Starter
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Fleet Mechanic
Joined: Feb 2001
Posts: 1,290
Likes: 15
From: Toronto, Canada
'78 351M Choke adjust?
Should my solenoid (dashpot) be in the out position until the linkage hits it coming back to idle?? What i mean is that should the solenoid be held in the out position with tension all the time??
Thanks!
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1978 F250 4x4 - 351M
Don't crush them, restore them!
Thanks!
https://www.ford-trucks.com/dcforum/User_files/3ae0a7e34062b4ad.jpg https://www.ford-trucks.com/dcforum/User_files/3ae0a7b33fe32dbb.jpg
1978 F250 4x4 - 351M
Don't crush them, restore them!
Laughing Gas
Joined: Dec 2000
Posts: 781
Likes: 18
From: East Texas
'78 351M Choke adjust?
weldman,
Yes it should be out. I'm not sure of the overall travel of the solenoid, but the solenoid is out on my carburetor even when the engine is shut off. It pulls back some on shutoff to allow the throttle to close. (I need to go back and check my Haynes manual to refresh my memory on some of this.)
Jason
1993 F-150 300 I-6/5-Spd.
1977 F-250 351M/4-Spd.
Yes it should be out. I'm not sure of the overall travel of the solenoid, but the solenoid is out on my carburetor even when the engine is shut off. It pulls back some on shutoff to allow the throttle to close. (I need to go back and check my Haynes manual to refresh my memory on some of this.)
Jason
1993 F-150 300 I-6/5-Spd.
1977 F-250 351M/4-Spd.
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