Motorcraft Carb
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Tuned
Joined: Apr 2007
Posts: 294
Likes: 30
From: VA
Motorcraft Carb
I have a Motorcraft 2bbl. carb on my '74 F-100 that I can't seem to get the idle down.360 stroked to a 390,C-6,2WD.I had a kit put in about 3 months ago and the idle always seemed high.I have the idle screw almost all the way out and it's still at 1,100 to 1,200 rpm's and I can't get it no lower.B.T.W. what is the correct rpm at idle for the 360-390 2bbl. carb?Thanks for the help guy's.I don't know what else to do.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Sounds like the fast idle is stuck on. Give this a read, particularly the "fast idle index" part: https://www.ford-trucks.com/forums/7...ml#post6422219
Lead Driver
Joined: Apr 2007
Posts: 5,958
Likes: 105
From: Houston
Reason I ask, I had a similar problem with my '78 mercury, guy put a rebuild kit in it and told me when I bought the car he thinks it needs a carb as he rebuilt it but it wont idle down. Come to find out he messed with the AC step up solenoid and the throttle lever was resting directly on it and the idle screw couldn't adjust the idle speed down anymore as the solenoid was stopping it.
Something to check into as it does happen.
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russrobbins
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
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Sep 30, 2004 08:15 AM
