Duramax Diesels Forum Truck of the Week
  #1  
Old 07-13-2018, 07:19 PM
shotgunwilly1117 shotgunwilly1117 is offline
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Default LLY Inconsistent fuel pressure

I have an 05 and have been chasing a ghost the past couple of months. At idle it would sometimes run rough with the fuel pressure jumping all around. Itís gotten worse the last week or so. I can now see my fuel pressure jumping around going down the road but I donít feel the rough running at speed. I have a lift pump installed if that makes a difference. Any ideas of where to start diagnosing? Picture/video of monitor to come
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Old 07-13-2018, 07:27 PM
shotgunwilly1117 shotgunwilly1117 is offline
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https://youtu.be/qeacuiAYoyM
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Old 07-13-2018, 07:27 PM
shotgunwilly1117 shotgunwilly1117 is offline
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https://youtu.be/yvFFNrxT9YE
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Old 07-13-2018, 07:43 PM
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IOWA LLY IOWA LLY is offline
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You have a sticky fuel pressure regulator. And it looks like your injectors are also on their way out....


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Best 1/8th, 7.29, 98.6MPH (Street tires, fuel only, single Journal bearing GT42 charger) (2010)

Best 1/8th, 6.93, 104.24MPH (Street tires, fuel only, single HX60 turbo) (2016)

Best 1/8th, 6.60, 106.6MPH (Street tires, fuel only, single HX60 turbo) (2017)
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Old 07-13-2018, 07:51 PM
shotgunwilly1117 shotgunwilly1117 is offline
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Is the regulator repairable or just replace? Injectors have 260 on them so that wouldnít surprise me
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Old 07-13-2018, 08:20 PM
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Replace. Make sure its an actual GM/Bosch part. Dont buy a cheap Chinesium one.
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Old 07-16-2018, 06:53 AM
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Brent@LDS Brent@LDS is offline
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Looks like an FPR issue.

http://lincolndieselspecialties.com/...regulator.html
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Old 07-22-2018, 07:22 AM
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bigedlittle bigedlittle is offline
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I replaced the fpr on mine for the same issue. Completely resolved it.

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  #9  
Old 07-23-2018, 02:22 PM
jcweller1 jcweller1 is offline
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Default Erratic Idle and or rough Idle

I had a similar problem 05 LLY and replace the FPR.
stopped the erratic up and down idle but never fixed the rough idle. I have new Doc Sadler Twister Injectors and a new CP6 flow matched injector pump and Kory Willis tuner. Runs like a raped gorilla but has a rough idle just when you touch the accelerator with you toe. Can't figure it out.
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Old 07-23-2018, 03:08 PM
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zakkb787 zakkb787 is offline
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Uh wut
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Old 07-23-2018, 04:50 PM
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Quote:
Originally Posted by zakkb787 View Post
Uh wut
Cp6 is 2x better than cp3 obviously.
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  #12  
Old 07-23-2018, 05:59 PM
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Put some clothes back on that gorilla. Sounds like thatís definitely your problem.


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__________________
2003 GMC CCSB LLY
Built by me, tuned by me.

2009 ECI Diesel Truck Points Champion
2010 ECI Diesel Truck Points Champion
2011 ECI Diesel Truck Points Champion
2012 ECI Diesel Truck Points Champion

Big thanks to everyone who helps me.

Best 1/8th, 7.29, 98.6MPH (Street tires, fuel only, single Journal bearing GT42 charger) (2010)

Best 1/8th, 6.93, 104.24MPH (Street tires, fuel only, single HX60 turbo) (2016)

Best 1/8th, 6.60, 106.6MPH (Street tires, fuel only, single HX60 turbo) (2017)
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  #13  
Old 07-23-2018, 09:19 PM
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