HELP, no boost
Hotshot
Joined: Oct 2003
Posts: 17,799
Likes: 103
From: Ashland City, TN
This "problem" truck has 226000 miles
I have NOT upgraded my HPOP. My other truck still has stock HPOP with the same setup and pulls like a freight train for 12hr stints (205000 miles)
I have borrowed a smoke machine to do a boost leak test (to be done Saturday).
I will turn my fuel pressure up tonight (on both trucks haha)
I have NOT upgraded my HPOP. My other truck still has stock HPOP with the same setup and pulls like a freight train for 12hr stints (205000 miles)
I have borrowed a smoke machine to do a boost leak test (to be done Saturday).
I will turn my fuel pressure up tonight (on both trucks haha)
The stock 15° pump in the OBS cannot keep up with 160 or higher injectors at load.
Which is probably why you're seeing such high duty cycles, which means you're not getting good fuel spray, which means low boost because the injectors are performing so poorly.
Bad fuel spray = high heat also.
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Trailering
Joined: Jul 2017
Posts: 17
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Other truck is also 97 cclb but is a dually w/ ZF6 conversion, I use it to tow 25k regularly with the stock (original) HPOP. She is a beast and this new 97 isnt even a sheep. It feels like an IDI 7.3 when you drive it.
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Trailering
Joined: Jul 2017
Posts: 17
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I just ordered 2 HPOP's from Full force diesel, should have them by Sat. (they are real close). So this weekend I will be installing a new HPOP on the lame duck 97. My dually is still running great so I'll wait a week or 2 and install hers. I will update post after install and see where we are at. THANKS to all that are helping me figure this issue out!!!!
Hotshot
Joined: Oct 2003
Posts: 17,799
Likes: 103
From: Ashland City, TN
I just ordered 2 HPOP's from Full force diesel, should have them by Sat. (they are real close). So this weekend I will be installing a new HPOP on the lame duck 97. My dually is still running great so I'll wait a week or 2 and install hers. I will update post after install and see where we are at. THANKS to all that are helping me figure this issue out!!!!
Adrenalins are sketch.
Though, if you got big injectors in your other truck, I'ma bet somebody swapped in a 17 degree at some point.
15 degree pumps are not capable of running the bigger injectors under heavy load without falling on their face.
160's are to big for a stock 15 pump, let alone the 180/30's you got.
There is a possibility you just got a really good 15 in the other truck if you've owned it since brand new, but thats super super rare for 15's to keep up with bigger injectors. The SD's went to 17 degree and only went up 30 cc's on the injectors.
Hotshot
Joined: Aug 2006
Posts: 10,764
Likes: 39
IPR DC % is what is called for . Not what you are getting . ICP is what reports to the PCM & the PCM tries to give you what you are asking for by increasing the open time of the IPR .
I'll assume the first pic is at idle . If true the ICP at idle Is a bit low (14 IPR % is normal). 41 IIPR % Is most likely pedal WOT (nearly ) .That is low too . 65 is max.
When you hit the go pedal the TPS tells the PCM what you want . The ICP reports to the PCM what you have & the PCM responds by opening or closing the IPR . Fuel pressure remains the same usually ( injectors are already full) and usually stay that way .The PCM does not monitor FP . THe HPOP oil pressure feeding injectors is designed to increase based on how open the IPR is .HPOP pressure increases based on a gear driven pump based on engine RPMs . The IPR lowers that pressure too .
You have an issue I have seen before with low ICP at idle . (unfortunately it was "many" years ago ) . I'll think about it & try to remember . Only one time did I hear about it .( it was on TDS ) Lets see what the new pump produces .
I'll assume the first pic is at idle . If true the ICP at idle Is a bit low (14 IPR % is normal). 41 IIPR % Is most likely pedal WOT (nearly ) .That is low too . 65 is max.
When you hit the go pedal the TPS tells the PCM what you want . The ICP reports to the PCM what you have & the PCM responds by opening or closing the IPR . Fuel pressure remains the same usually ( injectors are already full) and usually stay that way .The PCM does not monitor FP . THe HPOP oil pressure feeding injectors is designed to increase based on how open the IPR is .HPOP pressure increases based on a gear driven pump based on engine RPMs . The IPR lowers that pressure too .
You have an issue I have seen before with low ICP at idle . (unfortunately it was "many" years ago ) . I'll think about it & try to remember . Only one time did I hear about it .( it was on TDS ) Lets see what the new pump produces .
Hotshot
Joined: Oct 2003
Posts: 17,799
Likes: 103
From: Ashland City, TN
If I do remember correctly on this, If the DC keeps going up, that means what the pump is putting out is not matching what the ICP thinks it should be seeing.
So, higher than normal DC request = Low oil pressure in rails or bad sensor.
And some of that comes to tuning as well depending on what the tune is asking for PSI wise from the injectors at whatever throttle. The DC will reflect it making it or not making it.
A 15° at WOT with 180/30's should be showing 65%+ DC.
If my 15 couldn't keep up with 160's, there is no way a 15 would keep up with 30% nozzles at WOT.
I'd get maybe 2 or 3 seconds until it ran out of backed up oil pressure and fell on its face.
So, higher than normal DC request = Low oil pressure in rails or bad sensor.
And some of that comes to tuning as well depending on what the tune is asking for PSI wise from the injectors at whatever throttle. The DC will reflect it making it or not making it.
A 15° at WOT with 180/30's should be showing 65%+ DC.
If my 15 couldn't keep up with 160's, there is no way a 15 would keep up with 30% nozzles at WOT.
I'd get maybe 2 or 3 seconds until it ran out of backed up oil pressure and fell on its face.
Logistics Pro
Joined: Mar 2007
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From: knoxville, tn
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Hotshot
Joined: Dec 2012
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Likes: 1,658
From: Las Cruces New Mexico
IPR is is a bit high, specially at idle normal range are from 7%-9%. You might have a weak pump, bad IPR or wiring, bad injector O rings, or worn out poppet valves on the injectors.
Hotshot
Joined: Aug 2006
Posts: 10,764
Likes: 39
14% at idle is normal . You should go back & read the rest of the post .
Hotshot
Joined: Aug 2006
Posts: 10,764
Likes: 39
THe op is in the process of getting a new HPOP . Low IPR is usually plugged edge filter .
Hotshot
Joined: Dec 2012
Posts: 11,278
Likes: 1,658
From: Las Cruces New Mexico
