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Tech Question
Bryce Carpenter, Prospect, PA, 1971 Plymouth Fury 440
Hi Rick, I've got a '71 Fury, with a '70 440 Commando, Carter AVS #4741, Edelbrock Performer intake, stock '74 heads, bored .030, flat top Mopar pistons, Mopar purple cam #P4286677 (272º int./272º exh. duration, 0.455" int./0.455" exh. lift) factory hi-po exhaust manifolds, 727 auto with the stock converter and a mopar shift kit and a 3.23 Sure Grip rear.
The problem is that from a dead stop, upon accelerating normally, the car hesitates and I have to "feather" the throttle to get it going, then it'll take off like I got into it. I've rebuilt the carb twice installing a new accelerator pump, and tried installing different metering rod springs, but no change. The car has run like this ever since I restored it. It has about 3,000 miles on it.
What's the best way to fix it on a tight budget?
Thank You!
Bryce, there's something missing, broken, or generally screwed up in the carb's accelerator pump circuit. Guaranteed! Assuming you changed the plunger, and it's good, the problem is likely either a bad (or dirty) inlet check ball assembly, or a poorly seating discharge needle, which can be re-seated by gently tapping on the top of the needle with a drill rod and small hammer.
It's also conceivable that one of the passages, or the discharge nozzles (squirters) themselves, are plugged or badly clogged.
Should be an easy, obvious fix if you take the time to understand how it works, then what the malady is.
Rick
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