Bad Misfire!!!

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Feb 29, 2008 | 06:22 AM

88PONY

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Joined: Sep 2007

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From: Indio,California

Bad Misfire!!!

ok, i got a 91 f250 5.0l i've tuned this thing up 5 times changed everything and it still misfires under a load. it doesn't matter if its a hot or cold engine or if its hot or cold out it still does it. im lost ad tired of replaceing parts. any help would be great!!!

thanks

Feb 29, 2008 | 06:30 AM

BChance

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From: Los Alamos

What have you replaced, and with what?

Feb 29, 2008 | 06:32 AM

Animalistic

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From: Hillsboro, OR

From what I have seen, it is easy to get the plug wires crossed in these. Double and triple check your fireing order and make sure you are starting at the right place on the cap.

Feb 29, 2008 | 07:38 AM

88PONY

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From: Indio,California

i replaced cap/rotor,wires,plugs, and coil. all parts were wells and motorcraft. i heard a lot about crossing wires andit being bad. i habe an 86 f250 and it never had a problem. this truck is driving me nuts! is there a certain brand wire i should use?

Feb 29, 2008 | 01:00 PM

quicklook2

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Joined: May 2004

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From: Lakewood, Ohio

what kind of plugs? copper or plats?

are you positive you have the wires on correctly?

is timing correct?

Feb 29, 2008 | 02:04 PM

fmr9

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If the ignition is good, then maybe the compression, or the fuel is not.
Compression check is easy and quick. Not sure of an easy way to check the injectors.
Just an idea.
Frank