2002 LB7 Surging Idle - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 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 47 (permalink) Old 03-18-2011, 11:16 AM Thread Starter
 
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2002 LB7 Surging Idle

Hello, I know there are other posts about the surging idle issue and I am just wondering if Fuel pressure regulator is probably what is wrong with my truck before i throw parts at my truck.

I recently bought a 2002 GMC sierra with the 6.6 LB7 and the truck surges at idle when its in park or in drive. I have tried the fuel additive Diesel Kleen didnt have much affect on the surge. From visual inspection the fuel lines seem fine.

The truck has a fairly strong diesel fuel smell in the exhaust but does not smoke at all. Also there is a SES code on the motor right now its a MAF sensor out of range code not sure if that would affect the surging idle.

So i am not sure if it is the FPR or perhaps injectors or any other problem.

Any help would be appreciated, Thanks!

** Edit **

Also i am not sure of the mileage on this truck because whoever had it before replaced the dash on the truck judging by the wear i would say 200-300,000 miles

Also this is my first diesel truck so i am kinda new to this

Last edited by RoadrunnerJames; 03-18-2011 at 11:20 AM.
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post #2 of 47 (permalink) Old 03-18-2011, 01:47 PM
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My Quess is the fpr, but i would take the maf sensor out and clean it with only maf cleaner only, and allow it to dry completely before putting it back in.

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post #3 of 47 (permalink) Old 03-18-2011, 02:17 PM
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Mine does the same thing. Don't worry about it til it breaks, then put aftermarket performance parts in its place:rockin

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post #4 of 47 (permalink) Old 03-18-2011, 02:58 PM
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yah mine does it 2, and its very random not like a cycle? what causes that?

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post #5 of 47 (permalink) Old 03-18-2011, 03:06 PM Thread Starter
 
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Mine doesnt seem very random there is an even time between surges and it doesnt go away.
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post #6 of 47 (permalink) Old 03-18-2011, 03:22 PM
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its your fuel pressure regulator

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post #7 of 47 (permalink) Old 03-18-2011, 03:59 PM
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Quote:
Originally Posted by RoadrunnerJames View Post
Mine doesnt seem very random there is an even time between surges and it doesnt go away.
Same here. Get and ADII and chalk it up to that. When it's still surging, get the valve. That way your ole lady can't get mad at you got dropping the $630 on lift pump:rockin

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post #8 of 47 (permalink) Old 03-20-2011, 07:54 PM
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are you having to prime your filter occasionally or everyday?

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post #9 of 47 (permalink) Old 03-21-2011, 09:22 AM Thread Starter
 
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No i dont need to prime the truck, havent primed it since i changed the fuel filter.
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post #10 of 47 (permalink) Old 03-21-2011, 09:32 AM
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I would agree its the FPR.

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