LBZ: Turning rail pressure up at idle?

JoshH

Daggum farm truck
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Feb 14, 2007
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I'm on my phone now, so Idk the number. But it allows you to change the amount of rail pressure difference between actual and desired before low pressure code sets. They have it on lb7s

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I'm pretty sure those tables are available for the LBZ. Look in the diagnostics section under Fuel Pressure Error.
 

x MadMAX DIESEL

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Dec 30, 2008
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Its downloading right now. As soon as I get my truck off the trailer I'll test that out, maybe that will be what I've been looking for since I've been throwing this code.
 

x MadMAX DIESEL

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Dec 30, 2008
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Well I still don't have that table for some reason with 170.

I do however have the ability to block the p0087 code now in the dtc enables (C6001). Maybe if that DTC is blocked, it won't cut fuel in half.
 

x MadMAX DIESEL

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Dec 30, 2008
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Well I copied and pasted all my tables to a new single tune. I get a p0087 just idling. c1808 is set to 105, c1806 is 180, c1807 is set to -20... What could be the problem? could it be 1807 and 1806?


EDT: did a few more things and finally got it working, so far. Thanks Josh I never would have thought to look into a single tune for that table unless you said something.
 
Last edited:

Devon

broke my curse
May 2, 2010
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When this is done, and taking care of the p0087 code through them tables, you still technically have low fuel rail pressure right? So it really doesn't solve anything except the code it's self? Is that correct?


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x MadMAX DIESEL

<<<< No Horsepower
Dec 30, 2008
7,535
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Lexington, Ky
When the code doesn't trip, it won't defuel either... But yes you technically still have low fuel. Im still working on tuning it better, but so far in a hour long drive I got low rail pressure twice, once going through the river at low throttle, the other idling for 5 minutes. That's progress from tripping every 30 seconds at idle

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