I HAVE F250 WITH A 5

2001 Ford F-250

Tiny

Anonymous

January, 26, 2013 AT 1:25 AM

I have F-250 with a 5.4 gas engine. It has the check engine light on witch says their is a misfire in both #1 and #8 cylinder. I changed the fuel filter, and also ran fuel injection cleaner on a long freeway drive. Also it was pinging, so I started using high octane gas, and this seemed to help. It seems as if the timing is advanced slightly to cause the ping. What test should I do first to diagnose the problem?

FOUND 17085 RELATED QUESTIONS

3 Answers

Tiny

ASEMaster6371

January, 26, 2013 AT 1:28 AM

Check the plugs and coils. Do this first

additives for injectors rarely work.

Carbon build up could be the pinging

roy

Tiny

Kdzee

January, 26, 2013 AT 2:04 AM

I will change the plugs, and check the coils. Thanks Kdzee

Tiny

Kdzee

May, 17, 2013 AT 8:54 AM

Just giving everyone a follow up on what I did and the results. I changed the plugs and removed and cleaned all the injectors. I tested all the injectors, first by listening for a clicking sound while in operation. Then I removed them and submerged them in injector cleaner. I inspected all the O rings before reinstalling the injectors. I inspected all the coils and cleaned the contacts, they where green. I used a wire dryer to clean, and then put dielectric grease on all the electrical contacts. After everything was reinstalled, I reset the computer then just started driving for a couple hundred miles, the check engine light never came back on and the truck passed smog.

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