hesitation from a stop
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5 Year Member
Joined: May 2013
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hesitation from a stop
92 f150, 302 V-8, auto trans., E4OD
when accelerating from a stop, truck "hesitates" then goes.
Very Annoying!!
Discovered it only does this when I move the vacuum selector valve(VSV) on temp controller to any position except "OFF" (A/C, defrost , vent, floor, etc.)
Suspect vacuum leak(?), but not sure where to start. Maybe swap out VSV?
Any ideas...?
when accelerating from a stop, truck "hesitates" then goes.
Very Annoying!!
Discovered it only does this when I move the vacuum selector valve(VSV) on temp controller to any position except "OFF" (A/C, defrost , vent, floor, etc.)
Suspect vacuum leak(?), but not sure where to start. Maybe swap out VSV?
Any ideas...?
Last edited by 92truckguy; Jul 24, 2016 at 03:22 PM. Reason: adding info
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Joined: Oct 2016
Posts: 3,705
Likes: 766
From: Parts Unknown
You might want to look at your vacuum resevoir or the vacuum check valve for possible leaks. When they get real bad, you will notice your air conditioning will shift on its own to the defrost vents when you accellerate. Older ones look like a large can and the newer ones are plastic resembling a ball. Hang a vacuum gauge off the manifold and make sure you have a steady 18-22 inches.