Stock lbz throwing p0087

[Chase]

We have a stock 06 lbz with 227,000 and we are getting the P0087 code. Took it to GM and they are saying all 8 injectors are bad. I can't believe all of them are bad. I have checked the fuel rail pressure and actual is around 5500 psi and desire is within 50 to 100 psi ate an 680rpm. I have done the bottle test and we are not getting any fuel in the bottle. Truck runs fine until it throws the code. Can anyone help.

[blksmok]

We have a stock 06 lbz with 227,000 and we are getting the P0087 code. Took it to GM and they are saying all 8 injectors are bad. I can't believe all of them are bad. I have checked the fuel rail pressure and actual is around 5500 psi and desire is within 50 to 100 psi ate an 680rpm. I have done the bottle test and we are not getting any fuel in the bottle. Truck runs fine until it throws the code. Can anyone help.

Little more info...
When does it throw the code? What speed/conditions? (running empty at freeway speeds, towing heavy uphill etc...)

The easy stuff:
When was the last time you changed your fuel filter. Have you changed it since you started throwing codes?

The rail pressure readings you will want to look at are under load, not idle as I'm sure it doesn't throw a code at idle. Try and get some actual vs desired rail pressure numbers while in a condition that throws the code.

and :welcome:

[Diesel Tech]

My guess would be you are having trouble when you underload on hot days. I would also guess that it does it more when you have less than 1/2 tank of fuel. Let me know if I'm right and then I can tell you what to do.

[Chase]

Code comes on when it is hot out loaded with (5,000 to 8,000) On the freeway, Running around 60 to 70. We changed the fuel filter the first time it came on and it lasted a month about 2,000 to 3,000 miles. I have not personally drove it when the light comes on but my mechanic had or scanner on it coming home from the dealer yesterday and the rail pressure hit 25,000. Not sure the Actual verses the desire. I am going to drive it tomorrow to see if I can get it to come on.

[jevanb]

FPR might be going tits up. un plug it and the cp3 will command max , you will also get a code for the fpr but ignore that. as for the injectors what are the balance rates??

[Chase]

FPR might be going tits up. un plug it and the cp3 will command max , you will also get a code for the fpr but ignore that. as for the injectors what are the balance rates??

I will try un pluging the FPR that is what I am thinkings wrong. I will have to check the balance rates.

[Chase]

My guess would be you are having trouble when you underload on hot days. I would also guess that it does it more when you have less than 1/2 tank of fuel. Let me know if I'm right and then I can tell you what to do.


The code does show up on hot days and when he has 1/2 tank. If we let the truck set for 15min it will take off like nothing wrong for a little bit.

[TheStepChild]

Check your fuel lines. Feel the lines into + out of the filter. If they're soft, replace them

[Diesel Tech]

The code does show up on hot days and when he has 1/2 tank. If we let the truck set for 15min it will take off like nothing wrong for a little bit.


It's a common problem on high mileage LBZ's. The issue is caused by the fuel temperature and a worn CP3. We have found the best way to solve it is to add lift pumps and an extra fuel cooler. Have had to do this many times for those that tow in hot weather. Keeping the tank full helps as well but that's not always possible. We even had one the dealer replaced the injectors in and it did not solve the issue. Add the lift pump and cooler and customer has been having no issues and has put another 30,000 miles on it since being fixed.

[Iron-Hyde]

I have a friend who has a 160k mile LBZ with a lift pump, race valve in the rail, deleted stock filter housing, and good balance rates. it was throwing P0087 at WOT on the hottest tune he had, he had the PW backed down a bit, still did it. We just changed the CP3 last weekend with a brand new LBZ pump and reg. and it still throws the code. I don't know the fuel level in the tank, I will check with him. But it is odd that it happens with all of the mods listed and a new pump. I'm going to check for leaks, measure lift pump pressure, and do a bottle test last.... any other ideas?

[Diesel Tech]

Check to make sure the Race valve is not leaking. Just take the return hose off the rail and plug the hose. Start the truck and make sure nothing is coming out of the fitting on the rail. If that's OK at idle use a scantool (Tech II) to command the rail pressure to max and watch the fitting again, it should not have any fuel leaking out of it at any time. If it leaks at all it will cause a problem.

[ripmf666]

http://gsi.xw.gm.com/si/images/gmLogoFlat.gif Service Information




Document ID: 2207852
#PIP4526: Diesel Engine Fuel Line Repairs - keywords DTC hose kink loss P0087 P0093 P1093 pipe power reduced repair restrict restriction SES suction supply vacuum - (Nov 7, 2008)


http://gsi.xw.gm.com/image_en_us/gif/000/999/999/999999995.gif Subject:Diesel Engine Fuel Line Repairs

Models:2001-2007 Chevrolet Silverado Classic
2001-2007 GMC Sierra Classic
2007-2009 Chevrolet Silverado
2007-2009 GMC Sierra
Equipped with the 6.6L Diesel Engine RPO codes LB7 LBZ LLY LMM




The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern: (http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2207852&releaseDate=2008-11-07&name=Diesel+Engine+Fuel+Line+Repairs+-+keywords+DTC+hose+kink+loss+P0087+P0093+P1093+pip e+power+reduced+repair+restrict+restriction+SES+su ction+supply+vacuum&from=ns&bulletinNbr=PIP4526#ss1-2207852)

(http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2207852&releaseDate=2008-11-07&name=Diesel+Engine+Fuel+Line+Repairs+-+keywords+DTC+hose+kink+loss+P0087+P0093+P1093+pip e+power+reduced+repair+restrict+restriction+SES+su ction+supply+vacuum&from=ns&bulletinNbr=PIP4526#ss1-2207852)A dealer may need to perform a repair on the rubber portion of the fuel supply (suction) lines. The rubber section of the line could become kinked or collapse. Fuel lines that kink or collapse may induce a fuel system restriction (high vacuum gauge readings) or DTCs P0087, P0093, and/or P1093 to set.
If a technician was to suspect the rubber portion of the fuel feed line collapsing or kinking, replacement of only the rubber line is acceptable.
Recommendation/Instructions: (http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2207852&releaseDate=2008-11-07&name=Diesel+Engine+Fuel+Line+Repairs+-+keywords+DTC+hose+kink+loss+P0087+P0093+P1093+pip e+power+reduced+repair+restrict+restriction+SES+su ction+supply+vacuum&from=ns&bulletinNbr=PIP4526#ss2-2207852)


(http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2207852&releaseDate=2008-11-07&name=Diesel+Engine+Fuel+Line+Repairs+-+keywords+DTC+hose+kink+loss+P0087+P0093+P1093+pip e+power+reduced+repair+restrict+restriction+SES+su ction+supply+vacuum&from=ns&bulletinNbr=PIP4526#ss2-2207852)Complete the steps below to repair the rubber section of fuel supply line:
Carefully cut, split, and remove the OEM crimp from both ends of the flexible hose. These crimps can be cut with a small cut-off wheel. Split the crimp into two pieces (use your discretion on first cut location, then cut directly across from, or 180 degrees from first cut). Special care must be taken not to damage the flare on the end of the steel pipe that will be reused.
Remove the OEM crimps and flexible portion of hose from the existing supply line.
If replacing the rubber section of the supply line, a 1/2 ID hose meeting SAE specification 100R3 is suggested. Dealers may be able to find a local supplier for this hose, or can contact the manufacturer Parker Hannifin. The replacement hose would be a 1/2" diameter Parker part number 601-8 or H017-8. To find a local distributor the Parker website can be accessed at www.parker.com (http://www.parker.com/)
Use worm type hose clamps (use double clamps on each end) to attach the replacement hose to the existing pipe.
The locations of the flexible hoses are pictured below.


http://gsi.xw.gm.com/image_en_us/gif/000/002/207/2207818.gif
http://gsi.xw.gm.com/si/images/tif.gif (http://gsi.xw.gm.com/si/showTif.do?image=2207818)
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.


http://gsi.xw.gm.com/image_en_us/gif/000/999/999/999999994.gif WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© 2010 General Motors. All rights reserved.

[ripmf666]

Little biggier pic for you.
http://i133.photobucket.com/albums/q80/ripmf666/Gm%20print%20outs%20of%20parts/GMPartsPrintOuts021.jpg

[Chase]

We found that the fuel lines were collapsing so we are changing them let you know if this fixes it.

[Chase]

We changed the fuel lines and it didn't fix our issue. went all day today and then on the way home all most empty on the trailer and pulling the last hill it kicked itself in to limp mode. It had about 3/4 tank of fuel. To date we have changed the fuel lines, fuel filter. GM is still telling us it is all 8 injectors but it starts fine does not smoke and runs fine until it throws the code. Any other ideas. i hate to spend the money on the lift pump and it still not be it.

[ripmf666]

We changed the fuel lines and it didn't fix our issue. went all day today and then on the way home all most empty on the trailer and pulling the last hill it kicked itself in to limp mode. It had about 3/4 tank of fuel. To date we have changed the fuel lines, fuel filter. GM is still telling us it is all 8 injectors but it starts fine does not smoke and runs fine until it throws the code. Any other ideas. i hate to spend the money on the lift pump and it still not be it.


What part of the fuel line did you replace? at the filter head of the parts with the strong line as in the pic I posted above.

[GmcLbz]

It's a common problem on high mileage LBZ's. The issue is caused by the fuel temperature and a worn CP3. We have found the best way to solve it is to add lift pumps and an extra fuel cooler. Have had to do this many times for those that tow in hot weather. Keeping the tank full helps as well but that's not always possible. We even had one the dealer replaced the injectors in and it did not solve the issue. Add the lift pump and cooler and customer has been having no issues and has put another 30,000 miles on it since being fixed.

Doesn't this seem like a band-aid to the real problem?

[IOWA LLY]

Doesn't this seem like a band-aid to the real problem?


Care to tell us what the "real" problem is here?:confused::confused:

Bosch had originally spec'd that a lift pump be used in the fuel system of a Duramax, GM decided to leave it out and let the CP3 pump do all the work.


So how is installing a lift pump a band-aid?

[GmcLbz]

Care to tell us what the "real" problem is here?:confused::confused:

Bosch had originally spec'd that a lift pump be used in the fuel system of a Duramax, GM decided to leave it out and let the CP3 pump do all the work.


So how is installing a lift pump a band-aid?

I'm not trying to start a war...

Did the truck come from the factory with a lift pump?
If the cp3 is weak, why not just replace it?

Again, not trying to start a war just thinking out loud...

[IOWA LLY]

I'm not trying to start a war...

Did the truck come from the factory with a lift pump?

It should have.


If the cp3 is weak, why not just replace it?

I doubt its the pump. I agree its the injectors.

Again, not trying to start a war just thinking out loud...


Answers in blue

[GmcLbz]

Ok, if it was injectors how come replacing them didn't change anything? Also how many of these trucks run around everyday without a lift pump? Just trying to make sense out of this...

[Diesel Tech]

It is a combination of all the parts being worn and heated fuel. I have had LBZ trucks do this with as few as 50,000 miles on them. The lift pump only keeps the CP3 full and the extra cooler reduces the heat in the fuel. It works and is the cheapest fix we have found. So you look at the cost of 8 injectors, new CP3 versus a lift pump and cooler and make your own mind up. A side benefit of adding the lift pump is that fuel filter life over doubles too.

[GmcLbz]

It is a combination of all the parts being worn and heated fuel. I have had LBZ trucks do this with as few as 50,000 miles on them. The lift pump only keeps the CP3 full and the extra cooler reduces the heat in the fuel. It works and is the cheapest fix we have found. So you look at the cost of 8 injectors, new CP3 versus a lift pump and cooler and make your own mind up. A side benefit of adding the lift pump is that fuel filter life over doubles too.

Okay, I can agree with the cost for sure.:thumb:

[IOWA LLY]

Ok, if it was injectors how come replacing them didn't change anything? Also how many of these trucks run around everyday without a lift pump? Just trying to make sense out of this...


I read through the thread again, where does it say the injectors had been replaced and that didn't fix it?

[Chase]

What part of the fuel line did you replace? at the filter head of the parts with the strong line as in the pic I posted above.

We replaced the lower line first. We replacing the upper line and the line going to the tank today. I guess if this does not fix it we will look at adding a lift pump to it.


I read through the thread again, where does it say the injectors had been replaced and that didn't fix it?

We have not replaced the injectors on this truck. there was a post by Iron-Hyde that they replaced the injectors and the cp3 and some other parts and it didn't fix it.
My issue with the injectors being bad is the truck is not hard to start nor is it smoking. Our 02 when the injectors went at 200,000 it smoked and was hard starting.

[GmcLbz]

I read through the thread again, where does it say the injectors had been replaced and that didn't fix it?

It's a common problem on high mileage LBZ's. The issue is caused by the fuel temperature and a worn CP3. We have found the best way to solve it is to add lift pumps and an extra fuel cooler. Have had to do this many times for those that tow in hot weather. Keeping the tank full helps as well but that's not always possible. We even had one the dealer replaced the injectors in and it did not solve the issue. Add the lift pump and cooler and customer has been having no issues and has put another 30,000 miles on it since being fixed.

[Chase]

Replaced the lines from the tank to the pump and so far it has been a week and the truck is running fine.

[ripmf666]

Replaced the lines from the tank to the pump and so far it has been a week and the truck is running fine.

Good to hear also looks like your only about 45 mins away from me if you ever need any help. I'm up by Worlds of Fun off 435.

[Chase]

Truck is throwing the code again. I guess I am going to buy a lift pump and see it that fixes it.