Long Start Issue
Postmaster
Joined: Sep 2007
Posts: 4,195
Likes: 6
From: Medford Oregon
This truck sits in the garage as I pick parts off of it for my DD. I was thinking about this thing...I seem to recall reading something about a check valve of some sort for the LPO down around the filter. Is there one? If so, where do I find it? Is it possible that this could be letting the LPO drain out and causing the long start?
Thanks,
Mark
Thanks,
Mark
My understanding is the purpose of that valve is to supply unfiltered oil directly to the HPOP for starting purposes only, it's a spring loaded thing. To see if it's still there you would need to remove the oil filter and see if there is a nickel size hole inside the housing where the oil filter assembly screws into. If you can stick your finger in the hole then that part is missing.
Postmaster
Joined: Sep 2007
Posts: 4,195
Likes: 6
From: Medford Oregon
Mark, any update on this issue? Now that I've learned how to read these graphs correctly, thanks to you, I'm very curious why it's happening. I agree, it sure seems like the PCM is giving a HP oil signal to the IPR % but for some reason the HPOP is not responding very quickly, weird.
I do believe you, now, that the truck does start quicker with scanner connected while monitoring ICP pressure, at least on cold starts in my case. More on that issue at a later time.
I do believe you, now, that the truck does start quicker with scanner connected while monitoring ICP pressure, at least on cold starts in my case. More on that issue at a later time.
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Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
Mark, any update on this issue? Now that I've learned how to read these graphs correctly, thanks to you, I'm very curious why it's happening. I agree, it sure seems like the PCM is giving a HP oil signal to the IPR % but for some reason the HPOP is not responding very quickly, weird.
I do believe you, now, that the truck does start quicker with scanner connected while monitoring ICP pressure, at least on cold starts in my case. More on that issue at a later time.
I do believe you, now, that the truck does start quicker with scanner connected while monitoring ICP pressure, at least on cold starts in my case. More on that issue at a later time.
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