12-30-2011, 12:10 PM
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CC Member
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Join Date: Dec 2004
Location: Yorba Linda,
CA
Cobra Make, Engine: FFR, V8, Manual Trans, Htr, Wipers, Radio Delete
Posts: 327
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Not Ranked
Mark,
I know you've switched carbs back and forth trying to isolate this problem so this may or may not be relevant but I wanted to throw it out there anyway. When I first started my FRPP 351 crate motor I had a terrible time getting it to idle right. It was smoking like a diesel. What I did to zero in on it was to temporarily replace both power valves with plugs to take that fuel out of the equation. Then, even though they were new, ( brand new HP750 out of the box) I changed both needle and seat assemblies. You can clean them 'till you're blue in the face but sometimes they just stick.
From there I was able to get a clean idle by increasing the size of the idle air bleeds which really helped a bunch. Then I and added the power valves back one at a time but at a much lower opening point until I was sure everything was working right. Then I put the correct PVs back in. HTH.
Frank
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FFR - V8, Manual Trans, PS, Inop Wipers, No Radio, Gas Mileage so-so
Last edited by Frank Messina; 12-30-2011 at 02:29 PM..
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