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Old 05-28-2011, 05:21 AM
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hei in ford 351w

pls help
truck starts cold and runs, but runs a little rough.
once warmed up, and you turn off it will not start, almost like bad battery connection.
could the hei module cause this?

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Old 05-29-2011, 12:11 AM
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The module will let it turn over but not fire because of no spark.
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Old 05-29-2011, 12:13 AM
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Install a whole new set of ground straps on it. Grind down to bare metal and tie motor to frame and frame to body.
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Old 05-29-2011, 05:41 AM
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Tell us what the year of the truck/engine is as there are two types of ignitions - a separate module about 4x5 inches and mounted on the fenderwell. The other, is mounted on the distributor with 2 screws - this one needs dielectric grease between it and the distributor or some corrosion will form and run like you described. It may be heat failing as well. The other, fender well versions have histories, depending on brand of failing like you said - the fix: replace it

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Old 06-02-2011, 03:58 AM
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1986 f150 with carburated 351w
previous owner installed a gm type hei.
i replaced the module, cap and rotor, and vacuum advance so far.
im going to look at plugs and wires next.
pings at highway speed when accelerating and still will not turn over when warmed up.
thank you for the feed back.
pas
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