Whats the problem?
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Whats the problem?
I have 390 with about 12,000 miles in my truck. Has a 670 Holley, intake and headers. When ever I hit the gas from idle it bogs and pops thru the carb, I have to feather the gas to get it to go with out popping. If I'm crusin under 1500 rpm and I nail it, it will also stumble and pop. What wrong with it.
I Screwed in both idle screws and it dies so i dont think power valves blown and i have the timing set 12 degrees initial.
I Screwed in both idle screws and it dies so i dont think power valves blown and i have the timing set 12 degrees initial.
Last edited by ScottJM; Feb 7, 2005 at 07:09 PM. Reason: Left out something
Postmaster
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From: Littleton, CO
FE "Freakin Expensive"
Joined: Dec 2003
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From: Smith Mountain Lake, VA
Could be a lean running condition,accelerator pump to sloopy...to much Timing, Or a blown power Valve....If you have an older carb without the power valve blowout protection in it...all it takes is one good sneeze back thru the carb to blowout the power valve......
Russ
Russ
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Joined: May 2004
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Another cause could be a vacuum leak. Hook up your vacuum gauge and see what you get. If you are losing vacuum then your engine WILL bog and the extra fuel in the runners will "pop" back through the carb when it does get going.
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