Diesel Bombers SIGN UP NOW

National Association of Diesel Motorsports
Go Back   Diesel Bombers > Chevy/GMC Duramax > Chevy/GMC Duramax 04.5-05 LLY
Sign in using an external account
Register Forgot Password?
Search


Registered Members don't see these ads. Register now it's free!

Chevy/GMC Duramax 04.5-05 LLY Discussion of Chevy and GMC Trucks with LLY Duramax Turbo Diesel Engines

Welcome to Diesel Bombers Forums!
Welcome to DieselBombers .com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Diesel Bombers Forums community today!


This 05 GMC Duramax, driven 150,000 miles hard, use lots of offroad fuel, always changing the fuel filter, older Edge with Attitude, big intake, 4" Turbo back exhaust, new batteries..... Starts best in the morning, not instantly, but within 3-4 seconds. I drive 1.5 hrs ... JOIN NOW TO REMOVE TRACER

Reply
 
 
 
submit to reddit
 
LinkBack Thread Tools Search this Thread
  #1  
Old 01-31-2013, 01:37 PM
Newbie
Status: Tax Slave

   

Default LLY Cranks fast, wont start when Hot

This 05 GMC Duramax, driven 150,000 miles hard, use lots of offroad fuel, always changing the fuel filter, older Edge with Attitude, big intake, 4" Turbo back exhaust, new batteries.....

Starts best in the morning, not instantly, but within 3-4 seconds.

I drive 1.5 hrs to work, and it wont restart without starter fluid which I hate to use and avoid at all costs.

Seems to start easiest when cold. My suspicion is, hopefully, a bad flex line that may be collapsing.

Anyone have any experience with a problem like this??

I am not very familiar with diesel/duramax tech.

Thanks!!!!!
Reply With Quote
  #2  
Old 01-31-2013, 08:02 PM
Newbie

   
View Member's Albums

Default

Check your fuel filter(s)? I had a loose one before up front and it cranked but no start. I have heard of fuel pump housings cracking to form air in the system on these LLY's. Do you have a lift pump? Your CP3 may be getting tired. It is for sure a fuel issue based on what you wrote.
Reply With Quote
  #3  
Old 02-01-2013, 08:31 AM
Newbie
Status: Tax Slave

   

Default

Fresh, tight filter. I installed clear fuel line entering and exiting filter housing. The line exiting to the fuel control module doesn't stay "full" there is air that will not go away. Yet, the truck runs perfect. Drive perfect. Full power thru 3500 RPM. I will drive it to work today and see if this starting problem persists. I found someone who has a computer diagnosis program that may be able to check the fuel system components.
Reply With Quote
  #4  
Old 02-02-2013, 11:41 AM
Newbie
Status: Tax Slave

   

Default

So i removed the plastic cap on the fuel line behind the alternator. I guess thats where I test rail pressure? We put a hose on it, filled it with fuel, and pushed the pin with a rod... it kept taking fuel. We added about 2 cups. Seems that portion of the fuel system is starved (immediately after the fuel module behind alternator). Kept turning engine over with a sprits of starter fluid, finally started, ran perfect. Having a hard time locating a shop with equipment to test/service this motor.
Reply With Quote
  #5  
Old 02-08-2013, 08:51 AM
Newbie
Status: Tax Slave

   

Default

So some module or something is not functioning when truck is operating temp.

If I open the hood to cool it quicker, after running it, it starts right up after a couple minutes. If hood remains closed, it takes considerable time to want to start again.
Reply With Quote
  #6  
Old 03-06-2013, 05:53 PM
Diesel Fan
Status: Cummin Stroke on This DURAMAX!

   

Default

Ive heard of people having their truck start fine when it's cold but when it's warm it doesn't want to start. It's most likely air getting into your fuel system (fuel rail, pump, filter housing) or a bad injector(s). Any air that you have in your fuel system will cause hard or no starts.
Reply With Quote
  #7  
Old 03-18-2013, 02:01 PM
Diesel Fan

   

Default

Sounds like you have got yourself a "hot start" problem. I'm sure you figured that out. I haven't had that before on a duramax... On '04-'07 powerstrokes that exact problem is caused by a bad fuel pressure sensor lying to the computer. Try and google LLY hot start problems.

c-tane's Sig:'05 Chevy 2500 HD Crew Cab LLY 4x4 with modified airbox, AFE intake elbow, PPE boost controller, Finger Stick, Duramilage programming, Banks 4" exgaust, CST 6" lift, and 35" Rubber.'05 Ford Excursion 6.0 PSD 4x4; Zoodad air inlet mod, Bullet Proofed EGR, Blue Spring, 6.4 Bango Bolts, STC fitting upgrade, Original Headgaskets/Bolts, SCT programmed by, Eric, and Scan Gauge II with fuel pressure fitting.
Reply With Quote
  #8  
Old 03-18-2013, 04:03 PM
MillerBoyzDiesel's Avatar
Diesel Wrench

   
View Member's Albums

Default

you need to check with a scan tool what your rail press is while cranking, could be a weak fuel press relief valve, bad injector or two, something along those lines. deff. need to get a hold of a scan tool.

---AutoMerged DoublePost---

Originally Posted by eidolonusa View Post
So i removed the plastic cap on the fuel line behind the alternator. I guess thats where I test rail pressure? We put a hose on it, filled it with fuel, and pushed the pin with a rod... it kept taking fuel. We added about 2 cups. Seems that portion of the fuel system is starved (immediately after the fuel module behind alternator). Kept turning engine over with a sprits of starter fluid, finally started, ran perfect. Having a hard time locating a shop with equipment to test/service this motor.
That port is where you measure filter/system restriction. Its under vaccum. dmax doesnt use a lift pump in truck applications it relys on vaccum supplied by the cp3.

Last edited by MillerBoyzDiesel; 03-18-2013 at 04:03 PM.. Reason: Automerged Doublepost
Reply With Quote
  #9  
Old 11-19-2014, 01:27 PM
Newbie
Status: Tax Slave

   

Default

Yeee Haaa.... Almost 2 years of hardly using the truck, i kept researching, reading, and contemplating.... I ran balance Test with a Snap On scan tool. Injector 2 and 8 were off the charts... SO... I did a DIRECT INJECTOR FLUSH Cleaning and it seems to have corrected the problems of hard start / no start. I disconnected the fuel supply and return lines on the driver side at engine, connected 6ft of fuel line directly into a tank with 1.5 gallon Heating Oil, 1 gallon Amsoil Injector Cleaner, and a quart GM Delco upper engine cleaner... Shazammmm... Runs like new. I will check in if anything changes, or soon, if she's still starting properly.

Truck has 170,000 miles and the engine is all original aside from Edge Juice, EGR Delete, Big Intake, Big Exhaust.

CLEAN THE INJECTORS BEFORE YOU BUY NEW ONES.
Reply With Quote
 
 
 
submit to reddit
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


 
All times are GMT -5. The time now is 01:10 AM.

Copyright And Legal Notice Links Of Interest

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Diesel Bombers ® - All Content Protected Under Intellectual Property Rights Law of Registered Trademarks
Reg. No. 3,494,401 Cls. 100, 101 & 104 Under Int. Cl. 38
USE AT YOUR OWN RISK WE HOLD NO LIABILITY FOR ANY CONTENT RIGHT, WRONG OR INDIFFERENT

Protected by Copyscape Duplicate Content Check