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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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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  #8  
Old Yesterday, 07:22 AM
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I replaced the fpr on mine for the same issue. Completely resolved it.

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