Duramax Diesels Forum Truck of the Week
  #1  
Old 05-23-2018, 09:56 AM
Lt. DMAX Lt. DMAX is offline
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Default 3 rapid fire surges of engine power

Pulling away from a stop in a driveway, foot on brake, trans in D, there were three rapid fire surges of power over 1-2 seconds. it was if the throttle was pressed 3 times quickly with immediate throttle response. RPMs did not raise excessively but there was enough power applied that even with the brakes engaged the truck moved forward a touch with each surge.

2008 LMM basically stock, 99k miles, no recent service performed other than an oil change.

Thoughts on possible causes?
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Old 05-23-2018, 10:54 AM
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Fuel pressure regulator would be my guess.
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Old 05-23-2018, 01:29 PM
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Josh is probably right, but I have also had mine do that at random times, might just be another one of those LMM flukes.
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Old 05-23-2018, 02:39 PM
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My lml has done this also. Thought it was trying to go into regen at the time or something.
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Old 05-24-2018, 04:57 AM
Lt. DMAX Lt. DMAX is offline
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This was the one and only time I had experienced this. Ill keep an eye on it and report back if it occurs again.

What might be other symptoms if any of a failing pressure regulator?
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Lt. DMAX

2008 GMC 2500HD, SLE, Crew Cab, Red (of course...)
Banks Intake/Filter, Diamond Eye downpipe, Banks DPF back exhaust, Banks Boost Tube.

New OEM Headlight assemblies at 100k, all exterior and interior lights upgrade to LEDs from Superbrightleds.com.

Pioneer AVIC-W8400NEX Stereo, (4) Pioneer TS-A1686R speakers and "Frost King" sound deadening to all (4) doors , Camera Source 5CS-GMTRO Backup Camera w/ Tailgate Bezel and harness.
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Old 05-24-2018, 06:12 AM
Bdsankey Bdsankey is offline
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Quote:
Originally Posted by Lt. DMAX View Post
This was the one and only time I had experienced this. Ill keep an eye on it and report back if it occurs again.

What might be other symptoms if any of a failing pressure regulator?
Sporadic idle, haze, loud injectors, surges.
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Old 06-01-2018, 04:58 PM
Lt. DMAX Lt. DMAX is offline
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Since the rapid fire surges, the truck seams to have more power. It's like a restriction somewhere got released. Any thoughts as to what it may be and is this a good thing or is something like the FPR failing?
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Lt. DMAX

2008 GMC 2500HD, SLE, Crew Cab, Red (of course...)
Banks Intake/Filter, Diamond Eye downpipe, Banks DPF back exhaust, Banks Boost Tube.

New OEM Headlight assemblies at 100k, all exterior and interior lights upgrade to LEDs from Superbrightleds.com.

Pioneer AVIC-W8400NEX Stereo, (4) Pioneer TS-A1686R speakers and "Frost King" sound deadening to all (4) doors , Camera Source 5CS-GMTRO Backup Camera w/ Tailgate Bezel and harness.
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