Shran
Junk Collector
TRS Forum Moderator
Supporting Member
Article Contributor
V8 Engine Swap
Solid Axle Swap
Truck of Month
- Joined
- Mar 4, 2008
- Messages
- 8,687
- Reaction score
- 4,789
- Points
- 113
- Location
- Rapid City SD
- Engine Type
- V8
- Engine Size
- 5.0
I'll be interested to see what you find, my '86 F150 does something similar although I have done exactly zero engine work other than lower intake and valve cover gaskets. Starts great cold, runs great, starter really drags when the engine is warm.
I thought it was probably the battery since it's from '09 and has been frozen with zero volts multiple times, but nope, not that. I will probably throw a starter in it and see what happens - pretty sure it has never been replaced, got the truck from my grandpa in 2004, had 55k on it at that point and it's got just over 100k now and I have never touched the starter.
I haven't seen anyone suggest replacing the battery cables - I've seen cables corroded way down inside the insulation that do weird crap like this. Clean up the grounds while you're at it, especially the fuel pump/ECM ground wire that comes off the negative battery terminal.
I thought it was probably the battery since it's from '09 and has been frozen with zero volts multiple times, but nope, not that. I will probably throw a starter in it and see what happens - pretty sure it has never been replaced, got the truck from my grandpa in 2004, had 55k on it at that point and it's got just over 100k now and I have never touched the starter.
I haven't seen anyone suggest replacing the battery cables - I've seen cables corroded way down inside the insulation that do weird crap like this. Clean up the grounds while you're at it, especially the fuel pump/ECM ground wire that comes off the negative battery terminal.