Hey everyone,

To make a long story short, ive been having issues with my truck for over a year. I originally thought it was hpop related. I put in a riff raff hpop in it, new oem ipr and icp. Truck would randomly surge and studder after all of that was installed, and sometimes die like I shut the key off. (Majority of this would happen at idle, rarely while driving) it would also have very hard starts.

Then about a month ago I went out to start it, and all it would do is crank. No smoke, nothing. I am getting fuel as well. I have a driven diesel electric fuel pump on it. Pump is on and has fuel at the rail.

I ordered a OBD2 scanner to check my pressure and such at cranking and the truck started.. still having the original issue of dying and studdering. But it DID start..

So I tried removing the hydra tuner I have and that didnt make a difference either.. (truck ran significantly worse actually..)

After performing a buzz test i do have the following:
P1272 cylinder #2 high to low side fault
P1274 cylinder #4 high to low side fault

If this was all truly injector related wouldnt it just misfire and not just die like I turn the key off? And wouldn't it still start? (Also, injectors probably have 20k-25k miles max)

I even tried a different IDM. I still had the original crank no smoke no start issue..

I am really stumped with what is going on here.. I hope its just something dumb..

If anyone has some insight on what I could do here, I would greatly appreciate it!

 

What year truck and what injectors?

2 nd 4 souinds like a wiring harness issue to me or UVCH, going to take some work to look into it
ohm out with chart in this link
https://www.ford-trucks.com/forums/1...load-test.html

Swap PCM relay out with one next to it? Relay contacts can wear out after years.

 

Sorry, forgot to post the year.. its a 96, I cant remember for the life of me what injectors are in it..

Thanks for that chart. that is probably the next thing to do.

 

I hope injectors are single shots if not they need a tune to run split shots