Help w/ miss

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Nov 10, 2006 | 12:13 PM

currituckF150

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Help w/ miss

I have a 93 F150(5.0L,E4OD) that I am experiencing a miss under load. I have changed plugs(twice), cap, rotor, wires, computer, fuel pressure reg, & computer. I checked codes which are 311 & 332. I also checked fuel pressure which is 32psi @ idle and spikes to 40 when revved up. Please help, I can't afford to keep changing parts nor take it to a mechanic. Thanks.

Nov 10, 2006 | 01:24 PM

theman79

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From: Texas

make sure that wires for 7 and 8 aren't running parallel with each other, if so re-route them so that they only meet, if they have to at all, only at a 90 degree. try that

Nov 10, 2006 | 02:47 PM

currituckF150

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Thanks for the reply. I have them routed in cylinder order on each side using seperators that the factory supplied. They have been routed this way for the last 200,000 miles. I don't think that there is another way to route them.

Nov 10, 2006 | 03:04 PM

thomadm

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From: Florida

There is a diagram on the forum somewhere that shows the proper routing of the wires to prevent crossfire. I cant search so tring looking for that, might help.

Nov 10, 2006 | 03:32 PM

currituckF150

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Would a Haynes manual have the proper routing for wires? or could someone that can search find the diagram that thomadm is reffering to? Please

Nov 10, 2006 | 04:55 PM

thomadm

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From: Florida

Found the TSB on this issue. If your 93 has firing order 1-5-4-2-6-3-7-8, then #7 and #8, or #2 and #4 spark plug wires should be separated to prevent crossfire. Hope this helps.