Question about 1981 Ford F 100

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1980 F100 with a straight 6 cyl. Won't idle.

I have a 1980 F100 with a straight 6 cyl. Runs great, but all of a sudden it won't idle; it just dies when I stop. I've replaced all the vacuum lines but so far, no success. Where does the vacuum come from for the system? Maybe tracing that back to the source might illuminate the problem. I have a new rebuilt carb that will be put on in a couple of days. I'm hoping that's the problem but won't count on it.

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The vacuum comes from the intake manifold and ported vacuum comes from the carb above the throttle plate. You might have a leak at the carb gasket or intake manifold gasket. Spray some car cleaner or WD40 around the gaskets and vacuum lines while the engine is running and when you hear the idle speed up, you've found the leak. You will need to install the rebuilt carb first, and you should tighten any loose intake manifold bolts. Don't overtighten them. Also check the EGR valve because it could cause the engine to stall at idle. A good tune up might be needed too. I've seen some of those engines run real rough when the ignition timing was off.

Posted on Sep 06, 2009

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