2V 5.4L. Not noticeable on the tach, and only notice it if you drive the truck everyday. I changed the spark plugs and one coil. EGR valve, maybe? No check engine light on and it just passed emissions.
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2003 F-150 with slight misfire at idle
- Thread starter AKguy
- Start date
Plug wires? How many miles?
135k. No wires, has ignition coils.
Woops, I was thinking 93 like mine haha. Well if it is a coil pack, do a resistance test on the new one you just bought and compare that to the rest of them to see if you have another bad one.
I did it on all 8. Only 1 was bad, and I replaced it. At this point I can only think egr valve or maybe an injector starting to go bad?
Vacuum leak just behind the intake. Its a plastic 90° elbow that usually cracks and causes all sorts of misfire codes.
It's hard to troubleshoot something that isn't giving you a fault. If you suspect the egr valve and it's not to expensive I would say change it. If that doesn't fix your problem I wouldn't continue to throw money at it. Either drive it as is until it gives you a code or take it to a shop.
Maybe a f-150 forum? Someone else may have had this problem.
Maybe a f-150 forum? Someone else may have had this problem.
Look at the old plugs. Possibly carbon arcing down the boot/plug even though the coil is firing.
Crank the truck and spray some either behind the intake. Do it in small bursts slowly.
