428 carb
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Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
428 carb
i know this id not fe related but no one in the fuel forum can help with my 428 carb problems.my 600 cfm holley 4bbl stumbles the engine shakes when giving it gas and there is no power to the engine i tried to set the timing at 12 btdc and it ran fuff so i advanced it more till it was smoothe what is causing this and it does not like to accelerate fast either
Postmaster
Joined: Nov 2002
Posts: 3,447
Likes: 1
From: Littleton, CO
Have you recently rebuilt the carb? was it running fine previously? What have you changed to it lately. If it just started acting up, perhaps it has a little garbage in the meter holes. Why do you say it is a 428 carb? What model Holley is it?
--Mike
--Mike
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Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
the spark plugs are a tan color it ran fine with the motorcraft 2bbl with # 57 jets it has number 66 holley jets in it right now
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Post Fiend
Joined: Mar 2004
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From: Union, Washington
Aint the jets, main jets only control fuel metering at or near WOT. At part throttle the fuel metering is contolled by air bleeds and engine vacuum. Try closing both idle needle screws. If it runs better that usually means blown power valve. Check to make sure the accelerator pump is working properly. Also check for a vacuum leak. If the timing is too far advanced it will cause you popping and stumbling problem. You need to solve the idle problem so timing can be set properly.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Have you checked to see what your total timing advance is? Best to keep it below 36 for a premium gas motor and 30 for a regular gas one. Did the motor run better with the screws part way in? Where are the idle screws set? Did you check for a vacuum leak? How did you set the float levels? If nothing else make an adapter or buy one and reinstall the 2V and is if it still runs. I assume(that's proved way to often to make an "*** of you and me") you changed the intake manifold, the problem might not be the carb, could be something to do with the manifold, that's why trying the old carb is a good idea.
Post Fiend
Joined: Mar 2004
Posts: 6,056
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From: Union, Washington
Knocking is caused by one of two things, too much compression(expensive fix) and not enough gas octane or to much timing, either mechanical and/or vacuum)(cheap fix) and not enough gas octane. What is your compression ratio and what is your total timing advance. Rattling will destroy an engine very fast, so you need to cure it quickly. High octane cost way to much for anything but race motors anymore.
