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Author Topic:   carb problem

Posts: 765
From: St. James, MN
Registered: Apr 2002

posted 11-07-2002 11:42 PM     Click Here to See the Profile for BLstangin   Click Here to Email BLstangin     Edit/Delete Message   Reply w/Quote
The 302 in my 70 stang has a edelbrock performer intake on it , and a holley 600 vaccum secondary carb on it that a ford buddy of mine told me to try out. He said he had just rebuilt it, but had no use for it. The problem is it surges when I just cruise along at a steady throttle sometimes, and the next time it will run smooth as can be. Also when I shut it off I get fuel that runs out of the secondary throttle shafts and onto the intake, not much but makes everything wet. As soon as I start it it dries up and stays dry until I shut it off again. I have checked the float levels twice and they are right on the money. New fuel filters, and a new holley fuel pump. Also my buddy put center hung float bowls on it, if that makes a difference. Also my friends say that when they are behind me and I step on it there is blue smoke coming out the right pipe, but only the right side, and it does use a little oil, so I know that it's burning some, and my #4 plug also looks sooty compared the the rest, which are a nice brown color. I have a pcv valve on the right side valve cover that runs to the port in the rear right side of the carb. Could that be causing a problem, or could it be a blown intake gasket? Would a blown intake gasket cause oil to be sucked into one of the intake runners and make it use oil, or the surging. My secondary throttle shafts wiggle a little more then the primarys, don't know if that means that the bushings are shot or not though.I also have the stock exhaust manifolds currently to, if that makes any difference. Any ideas are appreciated, thanks. Brandon.

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Posts: 2354
From: Senoia, G.A. USA
Registered: Jul 2002

posted 11-08-2002 07:44 AM     Click Here to See the Profile for indyphil   Click Here to Email indyphil     Edit/Delete Message   Reply w/Quote
I wouldnt blame the PCV system for the blue smoke, sounds like maybe a valve guide seal is broken or missing, or maybe its a piston ring problem on that cylinder. I dont think the oil leak would cause surging.

Cant help with the holley carb, sounds like that secondary shaft is worn out and needs work though.

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Posts: 42859
From: Saco, Maine
Registered: May 99

posted 11-08-2002 08:39 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Originally posted by indyphil:
Cant help with the holley carb, sounds like that secondary shaft is worn out and needs work though.

I agree. I bet you can make the idle go up and down just moving the shaft up and down.

'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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