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Old 03-19-2013, 05:49 PM
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Am I On The Right Track Here?

Ok fellas, you guys are the best and have unknowingly helped me through many diesel dilemmas in the last year. But... I need you guys to verify that I'm on the right track here.

Three times in the last three weeks I have experienced long starts in the morning. After this morning I decided to hop on here and do some research. I came to the conclusion that it had to be either:

1) STC Fitting
2) ICP Sensor
3) HPOP

Hoping for the cheapest option I bought a new STC fitting this afternoon (5 day shipping). As luck would have it, I stopped by the store after work and when I came out...NO START!!! Just looooong cranking and no starting. I let it sit for 10 minutes and after several tries it reluctantly fired up. I limped it home with weak power.

My question is this:

Does this rule out the STC fitting and ICP sensor and mean that the problem has to be a bad HPOP?

I do see some oil residue running near the ICP sensor if that means anything?


My plan is to try and track down an HPOP tomorrow, but I wanted your reassurance first. Also, I may just delete the EGR when I'm in there. Suggestions are welcome.

I respect you guys and appreciate your input.
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Old 03-19-2013, 05:50 PM
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What year is the truck? Miles?
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Old 03-19-2013, 05:52 PM
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Sorry, it's an 06' with 78,000 miles.
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Old 03-19-2013, 05:55 PM
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Most likely not the HPOP itself. You're gonna have to supply air to the ICP port while commanding fhe IPR closed and listen for a leak. You most likely have an STC fitting, dummy plug or stand pipe leaking or a combination.
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Old 03-19-2013, 06:03 PM
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First of all, thanks for the help.

I read several posts about running this test, but need some clarity. I'm sure I'm about to sound real dumb, so bear with me. When you say supply air to the ICP port, how is this performed? Literally sticking a compressor hose in the port?

Also, I keep reading about commanding the IPR closed. I can't find any reference to how this is performed.

Clarity would be greatly appreciated.
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Old 03-19-2013, 06:08 PM
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Quote:
Originally Posted by btbarnes7 View Post
First of all, thanks for the help.

I read several posts about running this test, but need some clarity. I'm sure I'm about to sound real dumb, so bear with me. When you say supply air to the ICP port, how is this performed? Literally sticking a compressor hose in the port?

Also, I keep reading about commanding the IPR closed. I can't find any reference to how this is performed.

Clarity would be greatly appreciated.
You'll have to remove the ICP sensor from the valve cover and get a fitting that will thread into the valve cover with a fitting that you can connect an air compressor to. You will have to supply a minimum of 100 psi to that port. Best thing to do for the IPR is to go to the dealership and order a new IPR pigtail. One wire will be grounded and the other you supply 12v from your battery. Doing so will completely close the IPR valve. Don't supply power for more than 2 minutes at a time or you can damage the IPR valve.
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Old 03-19-2013, 06:13 PM
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Ok.

Side bar, would having an Edge Insight have helped me see this coming?
Would any codes have been thrown, etc?

I'm debating about finally spending the money.
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Old 03-19-2013, 08:24 PM
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Quote:
Originally Posted by btbarnes7 View Post
Ok.

Side bar, would having an Edge Insight have helped me see this coming?
Would any codes have been thrown, etc?

I'm debating about finally spending the money.
You wouldn't have seen that coming but it would allow you to monitor ICP to see what your HPOP psi is. It's well worth the money to have a monitor on these engines.
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Old 03-19-2013, 09:18 PM
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long starts in the morning? My first thought would be to check the FICM.

MikeB
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Old 03-19-2013, 09:21 PM
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Quote:
Originally Posted by PSDMikeB View Post
long starts in the morning? My first thought would be to check the FICM.

MikeB
I thought that too, but when you read farther into the post it talks about shutting it off hot and then not restarting until after it sits for a bit which points to HPO leak.
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hpop, icp, no start, stc fitting

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