Dropping ICP Upon Hard Acceleration
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Cross-Country
Joined: May 2016
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From: West Virginia
Dropping ICP Upon Hard Acceleration
At cold idle my ICP is 475-550 PSI, IPR 9.16--10.25%
At operating temperature ICP upon hard acceleration is up to about 2575 PSI, but drops off suddenly to about 15XX at WOT. IPR maxes out to about 44% at WOT, about 10.55--12.55% at warm idle.
Turbo boost pressure falls at this point as well, from about 22-25 to about 15-18 PSI, and drops off suddenly.
SES light appears with P!211 code, SES appears at hard acceleration/ WOT for about 10 seconds to 1 minute. Engine runs seemingly just fine. I just buttoned up some minor boost leaks two days ago, with a notable--albeit minor--improvement in low RPM response.
Weak HPOP?
At operating temperature ICP upon hard acceleration is up to about 2575 PSI, but drops off suddenly to about 15XX at WOT. IPR maxes out to about 44% at WOT, about 10.55--12.55% at warm idle.
Turbo boost pressure falls at this point as well, from about 22-25 to about 15-18 PSI, and drops off suddenly.
SES light appears with P!211 code, SES appears at hard acceleration/ WOT for about 10 seconds to 1 minute. Engine runs seemingly just fine. I just buttoned up some minor boost leaks two days ago, with a notable--albeit minor--improvement in low RPM response.
Weak HPOP?
Butt-Head
Joined: Apr 2004
Posts: 9,432
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From: Reed Point, MT
Since you have the ability to see data, what does your injector pulse width do? I see you have aftermarket tuning......I have some neat pictures I can share to show exactly what less than 0.5 milliseconds can clean up.
Laughing Gas
Joined: Jun 2013
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From: Yokosuka Japan
sorry just bought my first 7.3 today what is the stock boost supposed to be? its an early 99. all stock.
Hotshot
Joined: Jul 2008
Posts: 12,782
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From: N.GA Mountains
Like Cleatus said, could be related to tuning. Assssuming you have a chip/programmer if you’re seeing 22-25psi of boost.
Since you are getting P1211 and not an overboost code, I think we can rule that out.
So that means you’re losing HPO/ICP somewhere.
With a really long injector PW, it cold be just bleeding it away trying to keep the injector ‘open’ for longer than its doing any good. I would expect a lot of black smoke in this tune.
If this began to happen over time:
It could be leaky external injector o-rings. An ‘air test’ of the heads could help identify this.
It could be internal injector issues (poppet valve not sealing, etc). Checking pressure in one head at a time could identify this.
It could be a tired HPOP. I had one gradually make less and less PSI until it would get down to 1100psi with sustained throttle. I literally got passed by an old VW bus going up the mountain one day... Deadheading pump can test this.
Could also be IPR or ICP sensor malfunction?
Since you are getting P1211 and not an overboost code, I think we can rule that out.
So that means you’re losing HPO/ICP somewhere.
With a really long injector PW, it cold be just bleeding it away trying to keep the injector ‘open’ for longer than its doing any good. I would expect a lot of black smoke in this tune.
If this began to happen over time:
It could be leaky external injector o-rings. An ‘air test’ of the heads could help identify this.
It could be internal injector issues (poppet valve not sealing, etc). Checking pressure in one head at a time could identify this.
It could be a tired HPOP. I had one gradually make less and less PSI until it would get down to 1100psi with sustained throttle. I literally got passed by an old VW bus going up the mountain one day... Deadheading pump can test this.
Could also be IPR or ICP sensor malfunction?
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Thread Starter
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Cross-Country
Joined: May 2016
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From: West Virginia
The next time I take the truck out I'll record injector pulse width. Is this something that can be adjusted using ForScan Lite?
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Cross-Country
Joined: May 2016
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From: West Virginia
There is a Super Chip installed by the PO. DIY boost fooler set to about 25-30 PSI. IPR is an OEM replacement about two years old. HPOP and ICP unknown, likely 8/98 OEM. ICP has no oil in the plug receptacle.
Hotshot
Joined: Jul 2008
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From: N.GA Mountains
Return it to stock time and see if problem persists.
Lead Driver
Joined: Jul 2017
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From: WV
Originally Posted by Tomkat07
There is a Super Chip installed by the PO. DIY boost fooler set to about 25-30 PSI. IPR is an OEM replacement about two years old. HPOP and ICP unknown, likely 8/98 OEM. ICP has no oil in the plug receptacle.
Can someone who actually runs one verify my statement please?
FTE Chapter Leader
Joined: Jan 2005
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From: Henderson, NV
Not saying this is your problem, but this is too high of a setting for a boost fooler. The MAP will only read 25 max and that’s about the defuel point I believe. Your boost fooler should be set to around 22psi.
Can someone who actually runs one verify my statement please?
Can someone who actually runs one verify my statement please?
To the OP, don't forget that the MAP is reading ABSOLUTE pressure so atmospheric conditions can affect the reading.
