Daughter called me and said truck just died and would not start. Drove to her and in the time letting the truck sit, it started up, I drove it towards the house and it died on me. Let it sit, started up again then tried to drive to the rest of the way to the house and it died again. Would never start and run right again. Towed it home.


Tried several times to let it rest and start it , but it would never really start. I could try to rev it and keep it running, but it would spit and sputter then die.

Definitely getting spark so all those solutions are ruled out.
Check and cleaned MAF, no dice.
Checked all fuel system related fuses and relays, all good.
Bypassed the inertia fuel switch.
So must be fuel pump. Had daughter tried to start while testing for power at pump. ~13v, so all good.
Changed Fuel pump from another known running D2, noticed there was pressure when popping the fuel line lose. Hmmm, that didnt seem good.

Tried cranking truck, same symptoms, but did seem to actually idle and not die, just was sputtering.

Ok, so lets check to see if there is pressure at the rail, probably should of did that first.

And that's when I noticed this



That connection I have circled in blue had come loose. I plugged it back in, and have to rev the truck a few times, but it smoothed out and starting purring like a kitten. I also noticed I blew some oily stuff out the tail pipe.

I know it has something to do with the secondary air, but I didn't realize it had anything to do with the vacuum system. Anyone able to explain exactly what this is and why it kept the truck from running.

 

 

I have mistakenly left that hose loose before after changing the exhaust gaskets. It threw an SAI code but otherwise ran fine.

Although, I think that line goes straight to the intake so it would allow air to bypass the MAF. Air/fuel ration would be off so a rough idle makes sense I think.

 

I was getting spark, so I knew it wasn't that

 

Very ruff to no idle. I took it back off for some testing, but it was still running good. not sure if it needs to be detached for a while or if it was just a coincidence and it was the fuel pump. Going to try and crank the other truck with the "bad: fuel pump in it tomorrow to see how she acts.

 

 

Did the CPS thing a little over a year ago. I have spark.

The truck is fixed and running. Just trying to figure out if or why fixing the connection in the above pic fixed the truck.