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Dan, ASE Certified Technician
Category: Ford
Satisfied Customers: 1086
Experience:  Dealer Auto Technician
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2002 F-150 XLT 4.6 W. I installed a FoMoCo crate motor in

Customer Question

2002 F-150 XLT 4.6 W. I installed a FoMoCo crate motor in March. Also put in new plugs and COPs. Truck was running great. 4 weeks ago, went up to the corner store about 3 miles away with no problems. Got in the truck and started up the road, and the truck was running like it had a misfire. Changed the fuel filter, fuel pump and TPS. Took the truck to a transmission shop. They indicated no problems with the transmission. Seems like when I added Techron to a fill up, the truck ran better. The misfire is intermittent. It seems like when the truck warms up, the symptoms seem to be more pronounced. It runs great, then starts to stutter. If I floor it, it might bump a little a little bit. It seems to occur more when I back off the gas a little bit and accelerate, then the misfire is really bad. I honestly believe if was trash in the line or water in the gas, by now that would already passed through. I am wondering if I have a bad injector.
Submitted: 1 month ago.
Category: Ford
Expert:  Dan replied 1 month ago.

Hello my name is***** am an ASE Master Technician and I am glad to help you out with your question.

Expert:  Dan replied 1 month ago.

Have you had this scanned for codes for the engine?

Customer: replied 1 month ago.
No Codes. I pulled one of the injector plugs with the engine running and still did not get a code.
Expert:  Dan replied 1 month ago.

When the engine is at idle, pull the injector connectors one by one and feel and listen for the rpm to change. Do this to all 8.

Customer: replied 1 month ago.
Will do. Will check it tomorrow afternoon.
Expert:  Dan replied 1 month ago.

Ok let me know what you find.

Expert:  Dan replied 1 month ago.

You can do that with the coil packs as well.

Expert:  Dan replied 29 days ago.

Hello again Dan here,

I am contacting you because the post has not been closed or rated.

This question is coming up on 7 days which means it will time out and close.

You have already paid to get this question answered, but you have not rated.

Let me help some more. Is there anything else I can help you with?

If I did not give you 5 star service, please let me know what I missed.