holley/motercraft carb problem
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holley/motercraft carb problem
I have a 66 f250 352v8.
just installed a replacement 2 barrel carb(holley rebuilt motorcraft).
It idles at 2000rpms. cant get it to slow down.
tried idle speed screw, mixtre screws, no vacume
leaks. any ideas? should I not use the spacer?
thanks thomas endicott
just installed a replacement 2 barrel carb(holley rebuilt motorcraft).
It idles at 2000rpms. cant get it to slow down.
tried idle speed screw, mixtre screws, no vacume
leaks. any ideas? should I not use the spacer?
thanks thomas endicott
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holley/motercraft carb problem
I have the same setup on my 66' f250. you need the spacer! I tried removing mine and it ran like a ch**y haha. You should have a mixture screw on each side of the carb, turn both in all the way till they touch bottom (Not tight!!!) then turn them out 2 full turns, this is the starting point, you can fine tune from here by ear, 1/4 turns either way or more depending on your location. Mine are set at 2 1/4 out. The idle should be 600 to 900 depending on your preference. I'm shore someone will correct me if I'm wrong 
) but I'm running at about 750 rpm idle.
You should be able to adjust your idle speed by the idle adjustment screw, just below where the throttle cable attaches. I'm assuming that your carb has a manual choke? If not maybe someone else can step in and bale me out!) Hope this helps.
cjones
Where does that gizmo go?
) but I'm running at about 750 rpm idle. You should be able to adjust your idle speed by the idle adjustment screw, just below where the throttle cable attaches. I'm assuming that your carb has a manual choke? If not maybe someone else can step in and bale me out!
) Hope this helps.cjones
Where does that gizmo go?
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From: LAT 46.55501° & LON -122
holley/motercraft carb problem
Looking down the carb, can you see if the throtle plates closing fully? If they are, then look again for a major vaccum somewhere. If they are not closing fully then make sure that your choke is completely open and check to make sure that your fast (cold) idle screw is not touching the ramped cam plate that it normally rides on when the choke is partially to fully closed. This screw is usually on the passenger side of the carburetor and sometimes it is upside down and hard to access with a screw driver. Back it off a few turns or until it no longer touches the cam plate and see if this changes anything.
If this is the problem, then post us back. There may be some other adjustments to make because on most carburetors, when the choke is completely open, this screw should not make contact with this plate no matter how far it is screwed in. In other words, you should not be able to adjust you idle with this screw unless your choke is partially to fully closed.
If this is the problem, then post us back. There may be some other adjustments to make because on most carburetors, when the choke is completely open, this screw should not make contact with this plate no matter how far it is screwed in. In other words, you should not be able to adjust you idle with this screw unless your choke is partially to fully closed.
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holley/motercraft carb problem
thanx for your guys's help. figured it out. throttle plate was not closing because accelarator
linkage needed to be adjusted. it was pulling on the throttle lever and the idle adjustment screw was not even touching the throttle linkage to adjust any kind of idle, so the accelarator linkage held the plates open hence running at 2000rpms's
thanks again,
thomas endicott
linkage needed to be adjusted. it was pulling on the throttle lever and the idle adjustment screw was not even touching the throttle linkage to adjust any kind of idle, so the accelarator linkage held the plates open hence running at 2000rpms's
thanks again,
thomas endicott
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