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1965 Ford Mustang Backfire

Tiny
ALBURY27
  • MEMBER
  • 1965 FORD MUSTANG
  • V8
  • 2WD
  • MANUAL
  • 800 MILES
I have a 302 block that has been hopped up with a big cam, AFR aluminum beade, highrise intake and all the goodies inside. The engine ran great untill my mechanic suggested I put a better carb on it. 650 Holly duel feed. Now when I accelerate heavily, especially in 3 rd and 4th, the engine backfires and breaks up. With no load on the engine and in netrual she responds perfectly. The timing is right on and the electrical all seems dialed in. Electric fule pump reads 5 pounds, new fuel filter too. I do not hear and vacume leaks. Can you help?
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Saturday, December 19th, 2009 AT 3:36 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

Thank you for the donation,

I am not a fan of the Holliy carby, what was fitted before, this type of problem is usually a lean mixture problem, have you had an exhaust analyzer up the pipe as yet? If all was ok before the carby change, well I think you know where the problem is, get this looked at first.

Mark (mhpautos)
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Saturday, December 19th, 2009 AT 5:21 PM

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