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TRH
New User
Aug 30, 2007, 1:22 PM
Post #1 of 2
(1453 views)
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Calling all experts!
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Normally I wouldn't seek advice on such a seemingly simple problem, but I have been battling a hesitation on acceleration. The vehicle is a stock 1967 Mustang, California 289 W/Autolite 2100. Usually when this occurs, I replace the accelerator pump diaphragm and everything is back to normal. Not this time, so I tried a few simple things like adjusting the timing and checking the vacuum advance diaphragm for leaks. Still no fix.
After that I Checked the ported vacuum switch, Took the carburetor off and thoroughly cleaned and rebuilt it including replacing, the float, accelerator pump and changing to a different booster cluster. Still no good. I replaced the PCV valve and isolated the entire vacuum system. I have a Pertronix 0ne and Two, so for the hell of it I switched them out. With the exception of the hesitation, The car starts idles, and runs normally. The manifold vacuum at idle (2500ft elevation)is a steady 17in. The only thing I can think of is maybe the exhaust system has a partial block somewhere in it. I grasping at straws now and looking for suggestions.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 31, 2007, 5:31 AM
Post #2 of 2
(1446 views)
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Re: Calling all experts!
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Doesn't this use a "heat riser" on the passenger's exhaust manifold? That and rusted choke heaters (probably not this problem now) were problem spots,
T
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