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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 02-16-2015, 03:44 PM   #1 (permalink)
ChevroletMan06
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Loss of power (Please help, this beast is my money maker)

I just finished up plowing in NH. The entire storm went perfect. At the end I went to leave and accelerated heavily right around T/C locking (tow/haul) when the truck let out a puff of black smoke and then proceeded to bog down. I noticed on my way through a few lights any heavy acceleration got this same bogging down. Once on the highway I eventually threw a code (P0087) and the truck hit a 2k RPM limp. Only other codes are the EGR low flow (4"exhaust) and P0060 which is a generic powertrain/trans code and has been here a while with no issues.

Background: I have had this truck since 101k and have had zero problems except for glow plugs. I have (as long as I can remember; multiple years now) seemed to think that when I was flooring the truck WOT at times it felt like it wanted to go faster and as I slowly let of the throttle you would actually feel more power. This seemed to be intermittent but was definitely a regular occurrence. It seems, up to this point, to only be under WOT and even easing off slightly seemed to create more power.

Possibilities I know of:

1. Fuel filter (WIF/bleed screw/filter itself)

2. Pinched line coming from fuel tank

3. CP3

4. Injectors

other: Fuel lines complete, ball valve in filter housing, loss of prime/air, anything else?


What I am doing:

1. Bought all these, putting them in shorty, not feeling confident this will solve it, at all.

2. Possibly? I have 240k+ now, I could see lines going bad. I will check these shortly when I do the filter. What am I looking for? Just cracking?

3. I think I can count this out. On my way home after clearing the code I watched the Fuel Rail Pressure and tried several things. Out of tow/haul mode and in a low RPM situation I slowly pressed the pedal and watched the FRP climb. It seemed to be smooth and without issue. I then did it again right to the point before it would down shift and was able to get a reading of almost 25k psi. I was also able to keep it around 23k psi for an extended time climbing a hill in sixth gear. This leaves me to believe that it can keep and hold PSI in the FR. When I floored it and let it downshift I would see the FRP go from up in the 20k+ to about 13k and while I still was accelerating, it felt like a slug.

4. This is not what I want to hear. My question is with smooth cold starts (at -4 degrees), smooth idle, no smoke/haze on regular basis, and no past issues can this really be it? Also, if they are bad, will a tech 2 100% pick it up in the balance rates? Unfortunately my torque app does not read these.


This truck is my money maker and lifeline. Any advice would be GREATLY appreciated!! Any other ideas, etc. would be GREATLY appreciated. Thanks!!!

Dan

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2001 2500HD ECLB 6.0L
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Boss 8' Plow w/ Salt Dogg 2yd
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Old 02-16-2015, 08:11 PM   #2 (permalink)
Ramblinrodney
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Try again. No O2 sensors on our trucks.
Code: P0060
Modules: PCM
Description: HO2S Heater Resistance Bank 2 Sensor 2

Most likely you have this P0700 is the TCM requesting a MIL (Malfunction Indicator Light aka: "check engine"). All the 700 code does is tell the ECM "something's wrong" and to illuminate the MIL. There is another code in the TCM that you need to pull that will actually tell you what the malfunction. So get this code read and report back. This is what might caused your truck go into limp mode.

Since you were plowing was this ever done to your truck? Is your air filter plugged?
Post #5 https://www.dieselplace.com/forum/63-...-rpm-limp.html

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Last edited by Ramblinrodney; 02-16-2015 at 08:31 PM.
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Old 02-16-2015, 09:47 PM   #3 (permalink)
ChevroletMan06
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I have the torque app. It normally reads codes fine. I was incorrect but it reads P060b, sorry. This code has been here almost a year now. Never throws the CEL. CEL only comes on once the EGR Low Flow and that is about every couple weeks.

I have a month old ACDELCO Filter with white media. I have never ever looked at the MAF sensor. I will do this tomorrow morning with the fuel filter, etc. Would a MAF sensor issue not throw a MAF code? I have no idea and am not doubting, just looking for clarification.
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Old 02-17-2015, 08:42 AM   #4 (permalink)
Ramblinrodney
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Quote:
Originally Posted by ChevroletMan06 View Post
I have a month old ACDELCO Filter with white media. I have never ever looked at the MAF sensor. I will do this tomorrow morning with the fuel filter, etc. Would a MAF sensor issue not throw a MAF code? I have no idea and am not doubting, just looking for clarification.
You can have a one day old filter in your truck and you will have symtoms like you have. If you know how to search you will see that people that plow will get there intake full of snow and have the same problems that you are describing.
Yes there are MAF codes P0101, P0102, P0103 But I'm not talking about a MAF sensor. If you looked at my link above its about the redesigned MAP sensor that gets frosted up and also give symptoms like you have.
I'm just giving you info based on when your problem started after plowing.

First post it was P0060 now in you last post its P060b?

TSB Number: 060604066 NHTSA Number: 10021106 TSB Date: March 1, 2007 Date Added to File: March 5, 2007
Failing Component:
Engine And Engine Cooling:Engine
Summary:
Lbz, lly, engine with rough idle, poor performance, black/white exhaust smoke, MIL/ses light on and one or more of the following DTC's P003A, P060B, P0230, P0403, P0401, P0606, P2146, P2149, P2152, P2155. (reprogram ecm and replace egr mot
You need to re-flash your ECM again.
Your ECM was probably reprogrammed and it didn't take 100 percent if you had the your ECM tuned you have to send it back to your tuner otherwise you'll have to get the dealer to erase it and reprogrammed. I'm done with this thread.
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Transgo Jr. PCV Reroute kit, Trans Line Repair Kit By Dirty Hooker Diesel,
Custom Perf/Tow Tune by Kennedy
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Last edited by Ramblinrodney; 02-17-2015 at 09:04 AM.
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Old 02-17-2015, 10:48 AM   #5 (permalink)
HDpullingpower
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Check the bottom haLf of the plastic air filter housing, sometimes my 07 LBZ would plug up with snow and cause black smoke and sluggish throttle.
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Old 02-17-2015, 04:35 PM   #6 (permalink)
ChevroletMan06
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Quote:
Originally Posted by Ramblinrodney View Post
You can have a one day old filter in your truck and you will have symtoms like you have. If you know how to search you will see that people that plow will get there intake full of snow and have the same problems that you are describing.
Yes there are MAF codes P0101, P0102, P0103 But I'm not talking about a MAF sensor. If you looked at my link above its about the redesigned MAP sensor that gets frosted up and also give symptoms like you have.
I'm just giving you info based on when your problem started after plowing.

First post it was P0060 now in you last post its P060b?

TSB Number: 060604066 NHTSA Number: 10021106 TSB Date: March 1, 2007 Date Added to File: March 5, 2007
Failing Component:
Engine And Engine Cooling:Engine
Summary:
Lbz, lly, engine with rough idle, poor performance, black/white exhaust smoke, MIL/ses light on and one or more of the following DTC's P003A, P060B, P0230, P0403, P0401, P0606, P2146, P2149, P2152, P2155. (reprogram ecm and replace egr mot
You need to re-flash your ECM again.
Your ECM was probably reprogrammed and it didn't take 100 percent if you had the your ECM tuned you have to send it back to your tuner otherwise you'll have to get the dealer to erase it and reprogrammed. I'm done with this thread.
I appreciate the advice, really. Just so you are aware I was awake about 42 hours at the time I posted and it has been non-stop like that here since January 23 with snow work. I apologize I apparently wasted your time and aggravated you by having an error in my memory recall about which code it was. The second I saw your response I realized I had messed up and went to look up the correct one. Again, sorry I made a typing error, I had been up for 40+ hours. I realize there is a difference between MAF and MAP sensors and did read the link and the specified post by Kennedy.

P060b - This code had been here over a year. I am aware it has something to do with the ECM and in short, it needs to be reprogrammed. I did have a PPE tuner I borrowed for 2 weeks from a friend. That was 3.5 years ago. I don't see how that could start showing that code 2 years later, but possibly. The only other thing that happened, and was around the time I started seeing it, was a battery issue. It also reset my hours counter. Could this be related, IDK. I have noticed nothing out of the ordinary with the truck since this code has been around.

Today - I have completely removed the air box, air filter, intake tubing, MAF sensor, and MAP sensor. There was absolutely no evidence of snow in the intake or blockage of the air filter. All was clean and dry, including the MAF sensor.

I also removed the fuel filter (was at 18% life, I normally change by 33%) and replaced it along with the WIF and plastic bleeder screw on top. The bleeder screw was destroyed. It looked like I had cross threaded it and all the plastic threads were junk or broke off.

MAP Sensor - I took it out and it was covered in oily substance. Not completely but the boot definitely had oily/soot substance. I removed it and put it on the heated floor and then cleaned it off and re-installed.

I just got that back together and have to go run an errand. I will let you all know how it is running. Seems to be running great right now at idle, etc.

I still have not had a chance to inspect the fuel lines much and not at all by the fuel tank. The ones by the filter still seemed healthy.
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Old 02-17-2015, 10:22 PM   #7 (permalink)
ChevroletMan06
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Just got home. Went to dinner and ran some errands.

The truck is running flawlessly. I don't know if it was the cleaning of the MAP sensor or the fuel filter or the new bleeder plug. Maybe a combination of it all.

Thanks to ramblinrodney and hdpullingpower for your input.

I got all freaked out about injectors after I searched my TC (p0087) and it looked like it had many symptoms of it and a thread or two sounded exactly like mine did. Prior to this I was unaware of the MAP issues. Good to know.
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Old 02-17-2015, 11:00 PM   #8 (permalink)
ShopSpecialties
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A vacuum/pressure gauge like the one Kennedy Diesel sells is great for seeing how plug your filters are.
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Old 02-27-2015, 01:43 PM   #9 (permalink)
dmproske
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Mine did the same thing when fuel filter life was in the teens. I usually replace it around 20-25%. Scared the crap out of me when it happened I thought I had lost the CP3. New filter all happy.
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Old 02-27-2015, 02:02 PM   #10 (permalink)
dmax3500
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fuel filters can go out in 1 day,add some power service [white bottle] and keep driving

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