HPOP TEST RESULTS no start problem
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Mountain Pass
Joined: Aug 2006
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HPOP TEST RESULTS no start problem
Been fighting this NO START NO SMOKE problem for awhile. I did all the normal checks. I tested HPOP with manual gague dead headed pump 3800PSI. Tapped into drivers side head (with passenger side blocked off) Tested had 3500psi in and out of head held pressure for awhile. Blocked off drivers side head. Tested passenger side 3500psi going in VERY LITTLE PRESSURE coming out not enough to move gague. Valve cover is off no oil leaks NO OIL out of spurs. Even with cranking. Did injector o-rings last year. I pulling first 3 injectors just to check o-rings they were fine. SO MY ? IS HOW COME I HAVE NO HIGH PRESSURE OUT OF PASSENGER HEAD?
Postmaster
Joined: Sep 2007
Posts: 4,195
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From: Medford Oregon
How did you test it going in and out. Did you have a tee for in or something and used 2 gauges? Trying to get my head wrapped around the connections. And where is the out, we only have a in, correct?
Hotshot
Joined: Feb 2009
Posts: 10,410
Likes: 77
From: Plankinton, SD
Let me get this straight. You calling the in pressure off of the hpop line to each head? The out pressure on one of the head plugs? I guess I just want to be clear where you hooked your gauge to.
Jim is one of the better guys on here, so the more descriptive you can be, the better.
Jim is one of the better guys on here, so the more descriptive you can be, the better.
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Mountain Pass
Joined: Aug 2006
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Post Fiend
Joined: Dec 2010
Posts: 10,121
Likes: 3
From: Orrville, Ohio
Why did you only pull 3 of the 4 injectors to check the o-rings? Did you happen to look at the injector cups while you had them out? You're doing the right thing testing the HPO system the way you are, but if you're getting good pressure out of the HPOP and that bank won't hold pressure, then there is something in that bank that is leaking off pressure. I think you need to pull the fourth injector and check the o-rings and look carefully at the injector cups as well for cracks or holes.
Aside from that, here is a link that should help you out in diagnosing the no-start.
Crank No Start Flowchart
Aside from that, here is a link that should help you out in diagnosing the no-start.
Crank No Start Flowchart
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Post Fiend
Joined: Dec 2010
Posts: 10,121
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From: Orrville, Ohio
One more question, if you leave both banks hooked up to the HPOP and put your gauge on the driver side head, when you crank the engine what kind of pressure reading do you see? The reason I ask is that the ICP (which reads the HPOP pressure) is in the driver side head, so it should be seeing the same pressures that you are on the gauge. It may be that you have an electrical issue and not a HPO issue at all.
Aside from the HPO testing that you've done, have you done any other troubleshooting to try and diagnose the no start? I suggest you start at the beginning of the flowchart I posted above and follow the steps in order to try and eliminate the electrical portion of the system. Honestly, the majority of the time, these issues are related more to the electrical portion of the controls than the HPO side.
Aside from the HPO testing that you've done, have you done any other troubleshooting to try and diagnose the no start? I suggest you start at the beginning of the flowchart I posted above and follow the steps in order to try and eliminate the electrical portion of the system. Honestly, the majority of the time, these issues are related more to the electrical portion of the controls than the HPO side.
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Mountain Pass
Joined: Aug 2006
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I will pull 4 injector to check it. But I don't think that is the issue. oil control O-rings are really deep in injectors. The cups looked fine & cups have nothing to do with oil (fuel& water only) oil control o-rings are above cups. I did go through the flow chart. COULD IT BE A STUCK INJECTOR?
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Mountain Pass
Joined: Aug 2006
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I'm not saying the HPOP is bad. I'm wondering why motor is not firing & thinking its oil related. I've been reading web for 3-days seems nobody has ran across this problem? Is it to much pressure not allowing injectors to fire? Maybe I'll have to get back into the IPR again.
Post Fiend
Joined: Dec 2010
Posts: 10,121
Likes: 3
From: Orrville, Ohio
Again, do as I suggested and hook everything back up and out your test gauge in the driver side head so we know what the ICP is seeing. If the HPOP is working an the Injectors aren't firing, those high HPO numbers aren't out of the realm of possibility. I think you have an electrical issue.
You say you have stepped through the flow chart? And everything is working as it should be (WTS light comes on, Tach bounces while you're cranking it, Engine cranks over plenty fast, etc)?
You say you have stepped through the flow chart? And everything is working as it should be (WTS light comes on, Tach bounces while you're cranking it, Engine cranks over plenty fast, etc)?