carb help

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carb help

Post  77ford on February 9th 2013, 11:35 pm

stock 460 770 truck avenger in 4x4 truck 4 speed.. idles , runs great, no stumble from idle drives good until u open it up ... once the secondaries open it revs up for a just second then stummbles hesitates until throttle is let up then it smooths out runs fine. Won't run at wide open throttle driving, but will rev up just fine sitting.

New diaphragm in secondaries , changed power valve, carb was rebuilt ran great on my other motor . silver spring. Dont find any vacuum leaks

only thing that was changed was the carb to spacer gasket. This is the stock 4 hole non egr spacer my old one was thicker and had 4 holes same size,, the replacement is thinner and the 2 holes has a cut out between them in the center could this be the problem?

Thanks


Last edited by 77ford on February 9th 2013, 11:54 pm; edited 1 time in total

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Re: carb help

Post  69F100 on February 9th 2013, 11:46 pm

have you checked and seen if it is running out of gas
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Re: carb help

Post  77ford on February 10th 2013, 12:00 am

Hey there! Um no i have not i was wondering if the fuel pump was not pumping enough to keep up? This is a new truck i just got so im trying to work out all the bugs! It ran ok before but the secondaries wouldn't open so i replaced the diaphragm and they seem to be working now but it won't run long with it open. Now this new worse hesitation that wasn't there before. So i guess if the secondaries were not opening before it wasnt to bad now with them opening it is running out of fuel?

It had a slight stumble before under a load but not this bad. It all but quits.

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Re: carb help

Post  70FB on February 10th 2013, 12:27 am

Checked for vacuum leaks?
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