Lly surging in tow haul - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

 
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post #1 of 4 (permalink) Old 06-28-2019, 11:43 AM Thread Starter
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Lly surging in tow haul

04.5 lly, i noticed an issue when in tow haul mode, in slow speeds traffic in 2nd sometimes 3rd the truck starts to surge at i want to say around 1500-1800 and between 0-15% throttle, any ideas? Kind of seems like a fueling issue maybe? Upgrades are s&b mouth piece, pcv reroute, 3in downpipe, 4in exhaust, afe cai, and edge programmer. Any ideas? Thanks in advance.
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post #2 of 4 (permalink) Old 06-28-2019, 01:07 PM
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I recall some similar threads with the LLY many years ago...someone came up with a magical 'kit' to alleviate the issue.....which turned out to be a spring anyone could get from their local sources.

Spring......
It was determined that the skinny pedal had too light of a spring on it...too soft of a response feel, especially with heavy shoes/boots on.

The 'surge' feel was driver created, with the TC lockup in T/H making it hard to keep the foot steady in slow stop/go traffic in the lower gears torque-e-ness.

The 'kit' was an add-on $0.97 spring to the pedal to create more resistance....priced @ double digit $$ as a 'kit'.

It was lame and people revolted against the 'then' Vendor....who went on to have other questionable products offered to fix issues.

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Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
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post #3 of 4 (permalink) Old 06-30-2019, 08:07 AM
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Ahaaa!!!

I noticed the same thing trying to go slow over some ruts on the farm. Soooo jerky. Figured it was just insane throttle response lol.

Guess I'll look into replacing the spring. Or not. Id have to be pretty bored.



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2003 Sierra 2500 Crew 4x4–Charcoal Grey Metallic
325k kms and counting
LLY Head swap
LBZ full intake w/MP
Flo-Pro Downpipe
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post #4 of 4 (permalink) Old 06-30-2019, 08:29 AM
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At least you know it's not anything to worry about....but that boredom cycle can creep up on ya, especially when hibernating.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"
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