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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 05-15-2010, 02:12 AM   #1 (permalink)
rennat_2006
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Long cranking or no start when hot

So ive noticed in the last week or so that the truck sometime takes longer to start, I definetely noticed it but my troubleshooting mindset didnt click in so i dont know if it was just after a heat soak or not. I didnt mess around with it because of how random it was and it would only take an extra second or two of cranking to get it to fire. Well tonight the temperature was like 85* and i was running the A/C going down the freeway. I shut the truck down for like a half of an hour and went back out to start it for it to crank for like 10-15 seconds and not fire so i let off and let the starter cool for a minute and tried it again and it fired up and i instantly shut it down to go see if the primer pump had pressure. I was able to pump it atleast 3/4 times. I go and and drive it for like 10 minutes and shut it down for another half of an hour to come out and have it crank for like 10 seconds and not fire. Went out and pumped the primer like half a dozen times and it fired up. Went down and got a fuel filter for it and installed it just for ****s and giggles(only had 3800 miles on the old one) and took the bleeder screw out and primed it until i had fuel, Replaced the bleeder screw and primed it until the pump got hard and walked away to put the tools away. I came back like 5 minutes later and it had already lost 4/5 pumps worth of pressure.

Like i mentioned above ive been running the a/c today and it seemed like at stops idling in gear it kind of had a little surge to it, not enough to see it on the tach just barely enough to feel.

I visually looked over the lines coming into and out of the filter and across the front of the engine and didnt see any visual leaks. Im going to check the injector balance rates tomorrow morning with a techII. I quickly looked over the WIF sensor and didnt see any real obvious cracks but the wires are broken off of it anyways so its going to be replaced one way or another, Isnt there a vender here that sells plugs for the WIF sensor on the filters? O-ring isnt cut or anything on the bleeder screw but just for peace of mind i will probably replace that anyways shortly because i have seen so many of them break. I was thinking check valve inside of the filter housing but my friend the duramax tech that still works at the dealership i used to work for said that when they go bad it usaully bleeds off over night then you go out and it will run for a second and shut off.

So much for taking it outta town tomorrow The last time we went on vacation i was having random hard starting with my blazer to come home to it not starting at all and needing a fuel pump and now right before we go im having fuel issues with the duramax

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2000 Zr2 Blazer
SAS(HP d44), 4.88's, SYE, Wagoneer springs, 36" Iroks, Beadlocks, full highsteer, CV drivelines, etc

Last edited by rennat_2006; 05-15-2010 at 02:14 AM.
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Old 05-15-2010, 08:09 PM   #2 (permalink)
rennat_2006
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i checked balance rates today and number 5 and 7 were a little high compared to the rest. In park cylinder 5 and 7 were around + or -2.5 while the rest were + or - 1. Fuel pressure was good ramping it up to full pressure and watching the fuel pressure regulator on the graph with the tech2 the graph was kind of saw toothed(-_-_-_).

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2006 CCLB LLY
5" Flo-Pro exhaust with 6" tip, s&b intake, EFI live, Transgojr, Allison deep pan, Nicktane cat adapter, 17" wheels with 285's, nerfbars, ventvisors, fronts tinted to match rears with shadeband, and remote start.

2000 Zr2 Blazer
SAS(HP d44), 4.88's, SYE, Wagoneer springs, 36" Iroks, Beadlocks, full highsteer, CV drivelines, etc
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Old 05-15-2010, 11:00 PM   #3 (permalink)
jettech
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I've read as long as they are no more than +/- 4 you're ok. It sure sounds like you're loosing prime somewhere.
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Old 05-16-2010, 12:18 AM   #4 (permalink)
steakman
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...yup. You have air entrainment somehwere. LIkely culprit...?? Fuel filter or WIF sensor is cracked. The only reason a duramax wont fire..is cause it aint got fuel..period. If it takes longer..you've defiinitely got air somewhere.

Check you tightness on the oem filter
Check your WIF sensor to see it aint cracked.


If the above 2 dont work - sell truck and buy a Datsun..LOL (jk)

Theo
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Last edited by steakman; 05-16-2010 at 12:20 AM.
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Old 05-16-2010, 12:37 AM   #5 (permalink)
MB1
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Have you done any maintenance/ mods at all lately?


I was worrying about my front end clunking and grinding finally figured out it was the mudflaps I had put on.........
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Old 05-16-2010, 02:22 AM   #6 (permalink)
wreedLBZ
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wif sensor
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Old 05-17-2010, 01:14 AM   #7 (permalink)
rennat_2006
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i replaced the fuel filter after it started and verified i had no leaks.

its fixed now though. I got a tank of fuel from work that a coworker put some alcohol in just in case the 55 gal drum had some water in it. Well i took the truck outta town and ran what i had in the tank all of the way out and refilled with fuel from shell. Havent had any problems with it since i refilled this morning so i guess my coworker must have put a ton of alcohol in it, it was winter fuel, or maybe even both then with the 85* weather running the ac and letting it heatsoak the fuel was evaporating or something. Thats all i can think of.
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2006 CCLB LLY
5" Flo-Pro exhaust with 6" tip, s&b intake, EFI live, Transgojr, Allison deep pan, Nicktane cat adapter, 17" wheels with 285's, nerfbars, ventvisors, fronts tinted to match rears with shadeband, and remote start.

2000 Zr2 Blazer
SAS(HP d44), 4.88's, SYE, Wagoneer springs, 36" Iroks, Beadlocks, full highsteer, CV drivelines, etc
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Old 05-17-2010, 01:24 AM   #8 (permalink)
rennat_2006
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figured it out. Bad fuel. I got some fuel from work from a truck i had to drop the tank on. A coworker put it in a 55 gallon drum for me and put some alcohol in it just in case the drum had any water in it or anything. Well i dont know how much he put in, maybe it was winter fuel, or maybe both then coupled with 85* temps running the ac then letting it heat soak it must have been evaporating in the fuel rails or something. Ran the tank down and refilled with fresh fuel and haavent had any problems since.
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2006 CCLB LLY
5" Flo-Pro exhaust with 6" tip, s&b intake, EFI live, Transgojr, Allison deep pan, Nicktane cat adapter, 17" wheels with 285's, nerfbars, ventvisors, fronts tinted to match rears with shadeband, and remote start.

2000 Zr2 Blazer
SAS(HP d44), 4.88's, SYE, Wagoneer springs, 36" Iroks, Beadlocks, full highsteer, CV drivelines, etc
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Old 05-17-2010, 11:00 AM   #9 (permalink)
403DMAX
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Hey, I know you said you no longer had any issues, but you did say that the prime was being lost??? I think you may have remedied the issue when you changed the filter. The oring may not have been seated or something. I would keep a close eye on its behavior to make sure you dont have a bad o-ring in the primer on the filter head that may have been masked by you searching elsewhere for the time being. I often get DIY customers w/doubled up orings on the filter or cracked WIF sensor or a leaking primer pump oring...etc. Remember, unless you have an aftermarket lift pump, the dmax fuel system is under vacuum from tank to CP3, so any leaks will most likely not drip unless its @ a low point. The leaks will be an entrance for air to cause fuel to bleed back to tank.
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Old 05-17-2010, 11:24 PM   #10 (permalink)
rennat_2006
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I changed the filter friday night and it continued to do it later friday night then all day saturday until i filled up Sunday morning. Ran the whole tank of fresh fuel through it now too and everything is working fine.

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2006 CCLB LLY
5" Flo-Pro exhaust with 6" tip, s&b intake, EFI live, Transgojr, Allison deep pan, Nicktane cat adapter, 17" wheels with 285's, nerfbars, ventvisors, fronts tinted to match rears with shadeband, and remote start.

2000 Zr2 Blazer
SAS(HP d44), 4.88's, SYE, Wagoneer springs, 36" Iroks, Beadlocks, full highsteer, CV drivelines, etc
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