| PM | Quote | Reply | Full Topic |
Electronicals / Forscan Expert
Joined: Fri Nov 24th, 2017
Posts: 125
Status:
Offline
Reputation: 
Reputation Points: $user_rep
I feel like I'm the crazy coil guy cause I usually suspect the coil pack right off the bat. I'll explain why.
I drive a 99 F150 V8. Ive had so many issues with it this year. Its had a rough idle, sounded like a dead hole. Replaced a few coils, ran fine. Using pasting gear, sucked the crumbling intake gasket and began over heating. Replaced gasket and ran rough again. Mechanic cleaned mass air flow sensor and ran ok for a few miles. Lol. Changed a couple coils, ran fine again.
If it runs ok till it warms up I'm going coil all the way. I am not a mechanic, I'm just going off my experiences.
You've checked the ignition pretty thoroughly, you've ruled out vacuum leaks. How about fuel filter? Sometimes there is more than one and that's the one that's bad cause no one knew it was there. Bad fuel pump? Could be worn out or have a bad wire or lose connection that gets fussy when it gets jostled just right?
I'm mostly guessing, thinking of all the things I've had and heard that might cause your issue.
Have you tried a $20 bottle of techron? If it's so subtle and intermittent it could just be an dirty fuel line or injector and techron would fix that.
Fuel filter was replaced a few weeks ago along with fuel pressure checks at idle and at 2500 rpms. Not drop in pressure so flow to the rail seems fine. I've already put some techron in the tank before.
____________________
2000 XLT 2.5L A/T 2WD
Mods:
Power Windows/Locks Mirrors using OEM harness and parts
Explorer Sportrac White Face Cluster
Explorer OHC and Auto-dim Mirror
Auto Door Locks
Full HID Projector Retrofit