2004.5 surging - Page 2 - 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 #11 of 20 (permalink) Old 08-29-2018, 01:13 PM
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I believe that because the rail pressure isn't consistantly, its hard to know what the balance rates mean. I had surging on my 05 did both fprv and fuel pressure regulator and it fixed it. Not sure which one.

2005 Silverado 2500, Crew Cab Short Bed. 122,000 miles
MODS: AFE intake, LBZ mouth piece, MBRP cat- less exhaust.
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post #12 of 20 (permalink) Old 08-29-2018, 01:19 PM
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Quote:
Originally Posted by AaronOregon View Post
I have been chasing this same issue for a year now. Changed out FPR, CP3 w/another FPR, injector plugs, new filter head, race plug replaced FPRV, installed lift pump at 4psi. I am completely baffled at this point. Makes no difference if hot or cold, full or empty tank, etc. Has never dies, but I don't know how the way it chugs at lights.
So rpms are dropping? My Surge was a rev. Maybe control module issue?

2005 Silverado 2500, Crew Cab Short Bed. 122,000 miles
MODS: AFE intake, LBZ mouth piece, MBRP cat- less exhaust.
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post #13 of 20 (permalink) Old 11-01-2018, 03:01 PM Thread Starter
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Bottle test shows no leaks.

I put the truck on Tech 2 tool.

The truck was doing its norm surge up.. it jumps about 75 rpm.

I ran a cut out test on each injector.
The surge never went away as the injectors were cycles off..

The Rail pressure target was 5200. It ranged from 4700 to 5800 psi/

Now what???
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post #14 of 20 (permalink) Old 11-01-2018, 09:16 PM
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Fuel pressure regulator

2005 Silverado 2500, Crew Cab Short Bed. 122,000 miles
MODS: AFE intake, LBZ mouth piece, MBRP cat- less exhaust.
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post #15 of 20 (permalink) Old 11-02-2018, 12:46 AM
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I agree with dailydmax. Change the FPR WITH A BOSCH ONE! Dont use anyrhing other then oem bosch. I got mine from industrial Injection. Solved my issues.

04.5 CHEVY 2500HD CC/SB LT-Green, 2" Leveling Kit, Bilsteins, Wicked Wheel 2, Boost Stick, 4" MBRP Turbo Back w/ 5" tip, LMM Resonator Box, Airdog LP, PCV reroute, Airbox Mod with AFE Filter, LBZ MP, Fleece Tapshifter, EGR Delete, Edge CTS2, Mishimoto Trans Cooler, EFI Live Tuned/ Idaho Rob,5% tint, 260K and still going strong,
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post #16 of 20 (permalink) Old 11-04-2018, 07:46 AM Thread Starter
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FPR - how does it work?

How does this type of FPR work.. ?
It is a mechanical, spring operated valve??

Or an electronically controlled valve?

I just curious..

I spend an hour idling the truck while watching the rail pressure...
And observed..:
1. A steady idle.. see photo
2. Pulsing idle.. see photo

I going to replace the FRP upon seeing this..
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post #17 of 20 (permalink) Old 11-04-2018, 03:13 PM
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Electronic I believe


-head studs and gaskets
-66mm
-5Ē straight pipe axle dumped
-shimmed
-full s&b intake and mouthpiece
-dans diesel 800 HP built trans with biller stator
-dans built trans tunes
-glowshift EGT, boost, fuel pressure(have not found a sender to work for it yet), edge cts2
-Cognito built tie rods
-fuel lab 100 gph lift pump
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post #18 of 20 (permalink) Old 11-04-2018, 04:19 PM
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It’s an electronically controlled valve.

04.5 CHEVY 2500HD CC/SB LT-Green, 2" Leveling Kit, Bilsteins, Wicked Wheel 2, Boost Stick, 4" MBRP Turbo Back w/ 5" tip, LMM Resonator Box, Airdog LP, PCV reroute, Airbox Mod with AFE Filter, LBZ MP, Fleece Tapshifter, EGR Delete, Edge CTS2, Mishimoto Trans Cooler, EFI Live Tuned/ Idaho Rob,5% tint, 260K and still going strong,
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post #19 of 20 (permalink) Old 11-12-2018, 11:37 PM
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Quote:
Originally Posted by BlownL36 View Post
I agree with dailydmax. Change the FPR WITH A BOSCH ONE! Dont use anyrhing other then oem bosch. I got mine from industrial Injection. Solved my issues.
I hate this forum already. Finding solutions to problems I didnít know I had... lol

Mine has been hunting a little bit since changing injectors but because I went with larger than stock and itís only at idle with strong rail pressure when wot Iíve never considered it an issue... until now. Hah
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post #20 of 20 (permalink) Old 11-12-2018, 11:39 PM
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Finally replaced my phony FPR with a bosch one in the bitter cold last week. Idles like butter now. But now its eating the injector on cylinder 2 ughhh


-head studs and gaskets
-66mm
-5Ē straight pipe axle dumped
-shimmed
-full s&b intake and mouthpiece
-dans diesel 800 HP built trans with biller stator
-dans built trans tunes
-glowshift EGT, boost, fuel pressure(have not found a sender to work for it yet), edge cts2
-Cognito built tie rods
-fuel lab 100 gph lift pump
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