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02-01-2008, 03:52 PM
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#1 (permalink) |
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Diesel Fanatic
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LB7 Fuel pressure problems
Guys,
I am looking for some advice to properly diagnose what appears to be a low fuel pressure problem. My 01 D-max has had an idle surge for at least 18 months. Fuel filter changes and fuel additives have not had any positive effects to cure the surge. Initially it was just an occasional sudden surge at idle. Now the surge is almost continuous and I recently got a check engine light which turned out to be a 0089 "pressure regulator" code. The pressure regulator is $450.00 at the dealer and I do not mind changing it, but I want to make sure there are no other possible causes that might cause low fuel pressure before replacing the regulator. I changed the fuel filter again with no results. I have checked all the lines for signs of sucking air into the fuel. The problem persists even with a full tank. The truck runs fine other than the idle surge but it is a bit down on power at full throttle. I am using the PPE Excellerator tuner on the 3rd level power setting. What field tests can I run to check the Fuel Control Actuator and Fuel Pressure Solenoid? I assume the Fuel Pressure Solenoid is the actual fuel pressure regulator? I live in the Katy TX area so temperature is not an issue as far as fuel jelling or anything like that. I dont want to change parts blindly, rather I feel there is a test for everything. Any suggestions??? Thanks in advance for your help. |
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02-01-2008, 04:20 PM
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#2 (permalink) |
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Supporting Vendor
 
Join Date: Sep 2003
Location: Connecticut
Posts: 6,779
iTrader Score: 0 reviews
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2001's were known for a idle lope due to the Fuel Rail Pressure Regulator.
It is most likely the problem. Changing it is a time consuming job. Good Luck.
__________________
Tony Martino- Ridge Runner Diesel Performance, LLC
V2 - Autocal - Pre-Tuned ECM's available......... www.ridgerunnerdieselperformance.com  Custom ECM and TCM Tuning for 2001-2010 LB7, LLY, LBZ and LMM trucks, accessories and bundles available ! RRDP/COTN EFI-Live Sales |
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02-01-2008, 04:24 PM
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#3 (permalink) |
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Diesel Specialist
Join Date: Oct 2004
Location: S. California
Posts: 688
iTrader Score: 0 reviews
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As stated above. Common for LB7's. Do a search for FPRV, tons of info and pics.
__________________
2002 2500HD, CC, LB, 4X4, DM/ALLI, AFE STAGE 2, EFI Live, (PPE HOT +2 E.T. lv10 15,000 MILES NO ISSUES), (HYPERTECH LV3 AND EDGE W/ATTITUDE 5+5 RAN STACKED FOR 20,000 MILES NO ISSUES), SD LIFT PUMP/FILTER, SD PORTED FPR, SUNCOAST IV W/BRACE & 1057 MCRAT CONVERTOR INSTALLED BY MIKE L.  , 6" FABTECH, FABTECH STEERING STABILIZER/PITMAN & IDLER ARM, SD TIEROD SLEEVES, BILSTEIN SHOCKS, 315/75R16, AIRLIFT AIRBAGS, 4.11 GEARS, AMP RESEARCH POWER RUNNING BOARD, 3 PILLAR W/AUTOMETER PHANTOM GUAGES, TURBO TIMER, DUAL OPTIMA RED TOPS, 06 TOW MIRRORS
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02-01-2008, 05:26 PM
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#4 (permalink) |
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Diesel Master
Join Date: Apr 2004
Location: Baltimore Maryland
Posts: 2,469
iTrader Score: 0 reviews
DelMarVa Diesel Club Member |
x3
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GM Tech 2006 LBZ Chevy 2500 EFILive |
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02-01-2008, 06:01 PM
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#5 (permalink) |
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Diesel Specialist
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Ive had the same problem. Only p1093 and p1094 codes (low rail pressure at idle and on accel). Had the injectors checked. people on here say FPR, another dealer said injector pump. So I dont know what to do. My brother recently got a brand new FPR for free so im going to throw it on.
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02-01-2008, 06:14 PM
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#6 (permalink) |
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Diesel Master
Join Date: Apr 2004
Location: Baltimore Maryland
Posts: 2,469
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DelMarVa Diesel Club Member |
the rail pressure codes usually lead to other problems. The original poster had a p0089 code.
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GM Tech 2006 LBZ Chevy 2500 EFILive |
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02-01-2008, 07:51 PM
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#8 (permalink) |
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Diesel Master
Join Date: Apr 2004
Location: Baltimore Maryland
Posts: 2,469
iTrader Score: 0 reviews
DelMarVa Diesel Club Member |
easiest way is to get a dealer or someone with a tech II to do a graph of the fuel pressure regulator
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GM Tech 2006 LBZ Chevy 2500 EFILive |
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02-07-2008, 09:00 PM
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#9 (permalink) |
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Diesel Fanatic
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Well, the 2-cycle oil trick seems to have cured the problem. Within 30 miles of driving time the "Check Engine Light" and idle surges have completely disappeared. I am still in a state of shock that this actually works, but it definately did work on my truck. Evidently the PRV needs some lubrication not available in Diesel fuel oil. I very much appreciate everyones input to help out.
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02-10-2008, 10:06 AM
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#10 (permalink) |
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Diesel Head
Join Date: Sep 2006
Location: YORKTON SASKATCHEWAN CANADA
Posts: 45
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is there a certain type or brand of 2 stroke oil that people are using??? i have the idle surge with my truck and was wondering what i could try before replacing the pressure regulator
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2002 GMC C/C S/B 2500 HD SLT, 265 HANKOOK'S, EDGE JUICE / ATTITUDE.. K&N FIPK.. MORE TO COME WHEN MONEY ALLOWS 
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