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.

 

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

 

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.

 

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.

 

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

 

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.

 

hey thanks thoadm, didn't know that #2 and #4 had the same issue