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Old 11-03-2010, 10:15 PM
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Timing issue!

I'm having some major problems timing my Ford 302. mods are edelbrock rpm performer intake manifold, pertronix ignition, keith black flatops, isky cam .520 lift/280 duration, port and polished heads/strong valve springs, hedman shorty headers, and a napa electric fuel pump. symptoms are- hard starting (consistently have to pump the throttle to keep it running), when it does run it will not idle below 1300rpm, half the time it wants to idle at 3,000rpm. Runs fine at wide open throttle. What are your guys opininions? i've swapped carbs and it still didnt help the situation so that narrows it down to the ignition side of things. i also have the timing marks on my cam and crank set to stock. should i advance possibly?

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Old 11-04-2010, 02:15 AM
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doesnt sound like timing though you should definitely time at factory specs then advance bit by bit till engine likes it . Hows your throttle linkage set up sounds like the racing idle is related to binding somewhere .
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Old 11-04-2010, 09:29 AM
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i unhooked the throttle linkage and ran it by hand and it would still idle at 2,000 to 3,000 rpm and i know its not carburetor problem because i took that carb off and put it on my other truck and it sat there and idled at 900 rpm.
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Old 11-04-2010, 09:52 AM
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Im almost thinking i've got an internal vacuum leak from decking the heads and block maybe.
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Old 11-04-2010, 09:56 AM
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what model of dist is this? have you verified TDC and balancer timing marks/pointer? what are you timing settings:

base
mech adv
vacuum advance
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Old 11-05-2010, 01:21 AM
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I dont know if 2000/3000 rpm would be just a vacuum leak . That much of an air leak would be so lean it would be popping in the exhaust . Thats a lot of air without any extra fuel in the mix . I think it must be drawing air and fuel through the carb to get up that high . When its reving that high can you maybe see if its drawing down through the carb by putting your hand over it to feel the draw . If its only equivalent to an idle draw youl know the butterflies are still shut .
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Old 11-05-2010, 08:19 AM
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big cams need much more timing.

You don't have a stock engine anymore so using the stock timing specs doesn't make sense.

I would use at least 20 degrees at idle with that cam. Up to 30 at idle, depending on the compression ratio and if the starter can turn the engine over when warm.

Bigger cam require more timing at idle but the same total timing, so you need to shorten up the mechanical advance. Either modify the shock distributor or get one that is adjustable (like MSD).
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