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Old 01-19-2011, 09:38 PM
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383 very rich idle

Hello, ive had this engine for about a year and had always had 2 spark plugs that ran leaner than the rest of the plugs. Well i found that the intake had a leak in the front and also a little oil was seeping out, thats how i found the intake leak. Before I fixed the intake leak i was getting about 12hg vacuum at idle, now Im getting almost 17hg at idle at 850RPM. Now im having an issue where when i tune the carb optimally at idle for the highest rpm and vacuum, the plugs are a nice tan color after a drive, but it smells extremely rich and smokes horriblly. I have a holley double pumper 750 with a 6.5hg powervalve in the primaries and a block off in the secondaries. Im not sure what the jets are because its been a few months since ive had it apart.

What should i do to correct the rich idle? Before i fixed the vacuum leak I was getting about 15 city and up to 25 highway.

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Old 01-19-2011, 10:54 PM
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Is the smoking, black smoke, while driving or idle?

I assume the idle adjustment screws won't lean out the idle?

Jetting has nothing to do with idle, billowing black smoke accelerating, could be a jetting problem, high fuel pressure, float adjustment or stuck floats.

Can you see fuel dumping at idle?
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Old 01-20-2011, 06:47 AM
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What's your timing at idle?

Is your vac reading done in gear at idle (for an automatic)?

Your dizzy is advancing properly and fully?
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