SBC Still fuel fouling plugs, Losing my mind! - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-02-2005, 05:26 PM
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SBC Still fuel fouling plugs, Losing my mind!

My 388 sbc is still gas fouling plugs. Ive done everything even changed heads. After 2 or 3 cold starts plugs foul and start poping and missing warms up plugs clear out its ok until its started cold again. Its a 388 has a comp magnum 280 .480 lift. Edelbrock performer rpm heads perf rpm intake, 750 edelbrock carb. It has MSD 6A In good working order has a stock HEI with a externaly mounted Mallory super coil. Spark is very strong. Timing is set @8 deg initial 33 deg total. Ive had the timing every where. Vac advance is not used. Its had 3 different carbs on it.Feul pressure is 6 to 7 psi. Has hooker full lenght headers.I can put new plugs in it start it and take #1 out and it will be sooty black.Im using NGK FR4 plugs gapped at .038, thats the hottest plug I could get from NKG. Its the equivalent of champion RC12YC. Ive turned the mixture screws almost completely closed. Im lost! Does anyone have any other ideas?

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Last edited by 67 Deuce 4 Me; 09-02-2005 at 06:21 PM.
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Old 09-02-2005, 05:43 PM
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try a different plug brand and what is your fuel pressure set at..should be at or around 6-7 and no higher
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Old 09-02-2005, 05:44 PM
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My guess is that the carb is calibrated too rich. Borrow someone's 750 Holley vac. secondary jetted at 72 in the primaries and see if that works.

tom
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Old 09-02-2005, 06:17 PM
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I forgot to mention I checked the pressure its mech pump pulsatesbetween 6 and 7 psi. Ive tried autolite,ngk and champion plugs same outcome. gapping them at .038. Tom Ive had 3 differant carbs on it, 750 holley and I exchanged the 750 edelbrock thought maybe the first one was bad, same outcome.
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Old 09-02-2005, 07:05 PM
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Wow! that is strange only thing I would say do is check to make sure you have good engine grounds. What kind of coil have you checked it?
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Old 09-02-2005, 07:50 PM
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No I haven't checked the engine for a voltage drop but it cranks good. It has a Mallory coil best you can buy, big as a brick and oil filled.I check the spark with a spark tester spark was like a flame thrower I was turning the dist and I got hit threw the coil wire. I almost fell over I can personally vouch for the spark output! Can a bad engine ground cause this?
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Old 09-02-2005, 07:54 PM
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Doc here,

Yup!

But reading your first post..Sounds more like too much choke on start up..back it off OR don't use it at all for awhile and see if it goes away..

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Last edited by docvette; 09-02-2005 at 07:58 PM. Reason: added info
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Old 09-02-2005, 08:01 PM
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Choke not in use.
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Old 09-02-2005, 08:52 PM
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Fouled plugs

If you are not using a choke at all, maybe the carb is leaking down causing the rich condition while it is shut off and dumping fuel into the intake when it is off. How hard does it start without a choke. If they clear up after it runs a while then the jetting is probably ok. I would check float levels and before you start it next time take a look in the throtle body to see if it is wet. It should be bose dry after sitting for a while. If you have no choke I would not be surprise to get some popping when the engine is coold and running with warm mixture (NO CHOKE), this is noraml and should go away with warm up.
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Old 09-02-2005, 08:56 PM
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Fouled plugs

Have you done a vacuum check. You may have a leak that is sealing up when it heats up. This is not likely but you symptoms are strange. The vacuum gauge may tell a story.
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