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Hopefully this will help folks with the issue I had.
My son was driving truck and it just died on him while he was driving. He pulled over, got it started after 5 minutes, then it died again 15 seconds later. Solid cranking, but no start at all. Had it towed home and performed the following:
Checked spark...weak but there
Replaced crankshaft position sensor...no start
Switched relays for the fuel pump...no start
Checked connections to fuel pump...all ok no start
Removed relay and jumped the pins...fuel pump ran fine
Checked fuel pressure by pushing in schrader valve...solid pressure
Cranked truck and checked pressure again...all good
So at this point I focused on the weak spark and came across a thread on another site where the op had the exact same symptoms as me. His fix was to replace the fuse box on the drivers side.
As it’s Sunday and I need to get the car running for my son, I started looking at why the fuse box goes bad. Unless it has burned out, it usually goes bad because of corrosion. So my other hobby is restoring vintage stereo receivers. I have a product I use for buttons, connections, etc. that eats away the corrosion. It’s called DeOxit D5 by Caig. I figured I had nothing to lose so I removed the fuse box, all the fuses, and took the board out. I liberally sprayed the outside and the inside of the board and let it sit for about 5 mins, then I used compressed air to dry it out. Let it sit 3-4 hours to really dry and reinstalled. Took a few seconds to catch, but it started and it runs great. I will probably order a new fuse box anyway, but this may help someone in the short term. I know not everyone has DeOxit, but I think any contact cleaner would be ok. Stuff isn’t cheap, but it works wonders.
I’ll post back if there are any updates.
Last edited by humroot; Aug 11, 2019 at 06:29 PM.
Reason: added link