wont idle without choke
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New User
Joined: Jan 2006
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wont idle without choke
We'll i've got a problem with my truck. It is a 1981 f150, 351 modified with a motorcraft 2150. It will warm up with the choke on just fine, but it smokes. When it warms up, it doesn't smoke, but just recently it wont idle, it will sit/drive at about 2000RPMS but anything remotely idle speed it will just drop until it cuts off. Any ideas for what it could be? I'm hoping itll be a cheap fix. Thanks guys.
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Thread Starter
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New User
Joined: Jan 2006
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Yes, out the exhaust. It is a white smoke. I checked all the hoses and they seemed ok, I just rebuilt the carb and it was doing well. If i hold the throttle open a little bit it will idle well... its just like it takes more throttle to get the good normal idle like it should
Fleet Owner
Joined: Sep 2005
Posts: 28,609
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From: Lake Tahoe, Nevada
Right. White smoke is steam. A little steam when cold can be burning off condensation in the exhaust, but it could also be coolant sucked into the combustion chamber because of a crack or bad head gasket.
You might also try backing out the idle mixture screw to see if that helps, but it sure sounds like a vacuum leak to me.
You might also try backing out the idle mixture screw to see if that helps, but it sure sounds like a vacuum leak to me.
