Loss of Boost/Harder Starting - Possibly related?

[Nick Gustafson]

Hey all,
Over the past few days, I've noticed that my truck has been harder to start whether it's cold or warm, and that I'm not boosting as much as I was as soon as last week. I was pushing 22psi, and now I've gotta force it to get to 15psi.

I've considered that the issue might be a bad ops that's causing the lift pump to not work properly, but I cracked the T-valve, and it was pouring a steady stream of fuel. Also, I checked all of the boots and connections around the engine bay, and I can't find anything. The turbo is an HX35 with a boost fooler and a banks big head actuator.

I'm fresh out of ideas, and need some input, so what do you guys think?

 

[Quadstar Tuning LLC]

Any more smoke or does it seem like a lack of fuel issue? Could be as simple as a bad batch of fuel since it was running so well till now.

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[Nick Gustafson]

Oh she still smokes, no issues with that

 

[Quadstar Tuning LLC]

Test the big head with shop air to see if it's creeping open?

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[Nick Gustafson]

Don't have access to that for awhile, I'll try the regular holset actuator, and see what that will net for results.

 

[Quadstar Tuning LLC]

Stepper motor issues would cause both as well but should throw a code for a timing mismatch. Hard to tell without scan tool or data logging

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[Nick Gustafson]

Looks like it might be time to try my hand at making a data logging cable, if the stock actuator doesn't work out. We'll see what happens with that. I'm not going to be driving it enough until this weekend to get any results anyways

 

[Nick Gustafson]

Well I went to start it today after it sat for a few days, and after the glow plug cycle, she just pooped out and clicked. I think I've got a voltage drain somewhere, since I put in some new lights, so time to go check the wiring there....

 

[ak diesel driver]

I had a relay that the manufacturer wired wrong in their harness on my driving lights

 

[Nick Gustafson]

Well I tried charging it, but i realized i was hearing the fuel pump priming the system, and not the starter solenoids clicking, so I think I've found the starting issue