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1980 f150 l6 2wd carter 1barrel carb. The idle on my truck is great when its in gear, but when I shift to neutral it idles to high. What do I do to fix this without affecting the curb idle?
If you have a tach I usually set the idle to 400-500rpms in park and running. I also adjust the air/fuel mixture screw to get max vacuum. Has not failed me yet.
Is the distributor vacuum in the wrong location? If you want to see if this is the problem, take the dist line off and plug it, and then set the idle, and then with it still plugged, put it in and out of gear.
The overall tune and condition of the engine will also cause your problem.
If you have a tach I usually set the idle to 400-500rpms in park and running.
If you have an automatic, I would set the idle at about 500rpms IN GEAR (with the emergency brake on, of course) and running. The rpms will come down a bit when the truck is in gear from Park or Neutral. Anything less than that and my truck starts to shake and shudder. My own truck idles at about 750 rpms when in park or neutral this way, and never stalls when I put it in gear.
Originally Posted by Franklin2
Is the distributor vacuum in the wrong location? If you want to see if this is the problem, take the dist line off and plug it, and then set the idle, and then with it still plugged, put it in and out of gear.
Listen to Franklin! It sounds like you have your vacuum advance (from the distributor) hooked to full manifold vacuum. That will cause the problem you describe. Does your truck "slam" into gear when you go from Park? Make sure your vacuum advance is hooked up to a ported vacuum port.
Also ensure you're not misreading the timing marks' orientation to the pointer, I've seen guys
try and time an engine using the wrong side (or edge) of the pointer.
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