Fuel mileage problems with EFI Live - Chevy and GMC Duramax Diesel Forum

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post #1 of 17 (permalink) Old 01-24-2013, 10:01 AM Thread Starter
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Fuel mileage problems with EFI Live

Hi guys 2003 chevy 2500hd EC SB. My problem is that since I got my efi live my truck wont get over 16 mpg hand calculated. Its not due to my driving habits and i only use the truck to go 20-30 miles a day. I have tried mulitipule times on each tune including optimized stock and it gets 16 miles to the gallon. I had the injectors replace 10k miles ago and i run amsoil in the motor. Could it be a bad tune? could it be a failing injector already?
Thanks guys I appricate it, Dustin
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post #2 of 17 (permalink) Old 01-24-2013, 06:02 PM
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Do you own a V2? Try a power balance test or check your injector balance rates. New injectors should have lasted more than 10k miles, but improper installation or a leaking cup could always be a problem, not to say that manufacturer defects are unheard of.

Regarding your tune, reduce the desired boost as cruising speeds (2000-2500 RPM) on your maps. It takes fuel to make boost. Even on my hottest tune, I barely lift the needle on the boost gauge once I get on the interstate, and I get about 20 highway.

If you have some money you aren't using, get an Air Dog or a fass (fuel lift pump) and fill out your sig so we know what you're working with.
Good luck!

2003 Chevy 2500HD D/A ECSB 221K (Sold)
EFI Live DSP5 (thank you to Dustin and Idaho Rob @ATP Trucks), batmowheel & BD wastegate (thanks to MrManners @ Synthetic Motorsports), Kryptonite tie-rods, MBRP downpipe and 4" straight pipe, 33" BF Goodrich A/T KOs on H2s

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post #3 of 17 (permalink) Old 01-24-2013, 06:11 PM
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what kind of milage are you getting on a longer run? cause 20-30 miles a day is like city driving so your mileage aint going to be real high anyway.

Dustin - 2014 Silverado 1500 Z71 5.3
SOLD-03 GMC Seirra 2500HD CCSB LB7

K&N intake, 20" Black Moto Metal 961's, 285/55R20 Nitto Terra Grapplers, Kicker speakers, Straight Pipe,PPE Boost Valve
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post #4 of 17 (permalink) Old 01-25-2013, 12:11 PM Thread Starter
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No i do not have the v2 i went with the pre tuned ecm from ATP trucks. I do have a diesel shop within driving distance to get my injectors balance rates checked.... Longer trips I also see right at 16 miles to the gallon longer being 250 miles highway and interstate. and yes your right 16 isn't necessarily horrible in town but I just expected and herd from others that were getting a little better. Anyway thanks for the replys i appricate it

Dustin

2004 Chevy 2500 HD ext cab LB7. EFI by ATP. MA700 trans. T-case brace and pump rub fix. Cobalt guages&CTS. ADII 165. Cognito suspension. PPE boost valve. Pro Fab turbo horn. K&N intake. Injectors 1/1/2015. 5" straight pipe. Traction bars.

Previous Trucks.
2006 Chevy 2500HD Crew cab short bed.
4 inch MBRP. Edge Insight CTS. EFI Live by ATP.Alligator Transmission lines.

2003 Chevy 2500HD. EFI Live DSP5 by Idaho Rob.
Air Dog II 165. Alligator turbo horn. PPE boost valve. 4 inch straight pipe.
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post #5 of 17 (permalink) Old 01-25-2013, 12:17 PM
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I am having the same problem on my 03 with the ppe I was getting 16 city and 20 hwy since I've gotten efi live my mileage is 13.5 city and 17 hwy if I'm lucky


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03' LB7
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post #6 of 17 (permalink) Old 01-25-2013, 12:20 PM Thread Starter
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who did your tuning and what size tires are you turning?
I was wondering if an intake would help me out, i really doubted it would Ithink they are mainly for looks but i see you have the s&b

2004 Chevy 2500 HD ext cab LB7. EFI by ATP. MA700 trans. T-case brace and pump rub fix. Cobalt guages&CTS. ADII 165. Cognito suspension. PPE boost valve. Pro Fab turbo horn. K&N intake. Injectors 1/1/2015. 5" straight pipe. Traction bars.

Previous Trucks.
2006 Chevy 2500HD Crew cab short bed.
4 inch MBRP. Edge Insight CTS. EFI Live by ATP.Alligator Transmission lines.

2003 Chevy 2500HD. EFI Live DSP5 by Idaho Rob.
Air Dog II 165. Alligator turbo horn. PPE boost valve. 4 inch straight pipe.
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post #7 of 17 (permalink) Old 01-25-2013, 01:12 PM
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My tuning is done by Starlite diesel I am pretty sure he does a lot of tuning for industrial injection as far as tire size 305/55/R20


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03' LB7
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post #8 of 17 (permalink) Old 01-25-2013, 01:49 PM
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Remember that winter time typically means worse mileage. A) due to winter blend fuel. B) harder for the truck to warm up. C) if you only drive short distances like you said the truck doesnt get up to temp and a cold diesel isnt very efficent.

thanks
dustin

Blackout :06 GMC lbz 4x4 Built motor, HSP twins, DDP Injectors, Self built trans 11.68@118.5
Over Built :07 Chevy lbz 4x4 Caged and built 10.42@134
The Car: 2014 Chevy Cruze 2.0 Diesel
Special thanks to: Mike L, Gtrippin, IdahoRob, Dmaxstore, HSP, ISSPRO, Yukon, Airdog

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post #9 of 17 (permalink) Old 01-25-2013, 02:00 PM Thread Starter
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Thanks for replying! I do always plug it in well under 30 degrees or so and i also allow it to warm up for 5-10 minutes but still your right do you think that it would be worth it to have the injector rates tested? no white or blue smoke no fuel in oil but i have a warranty on them about to run out? thanks!

2004 Chevy 2500 HD ext cab LB7. EFI by ATP. MA700 trans. T-case brace and pump rub fix. Cobalt guages&CTS. ADII 165. Cognito suspension. PPE boost valve. Pro Fab turbo horn. K&N intake. Injectors 1/1/2015. 5" straight pipe. Traction bars.

Previous Trucks.
2006 Chevy 2500HD Crew cab short bed.
4 inch MBRP. Edge Insight CTS. EFI Live by ATP.Alligator Transmission lines.

2003 Chevy 2500HD. EFI Live DSP5 by Idaho Rob.
Air Dog II 165. Alligator turbo horn. PPE boost valve. 4 inch straight pipe.
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post #10 of 17 (permalink) Old 01-25-2013, 03:17 PM
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i dont think having the injectors tested is necessary.

Remember too if you let it warm up for 10 minutes everyday that is gonna add up quick.

IMO 16 is good for winter.

Blackout :06 GMC lbz 4x4 Built motor, HSP twins, DDP Injectors, Self built trans 11.68@118.5
Over Built :07 Chevy lbz 4x4 Caged and built 10.42@134
The Car: 2014 Chevy Cruze 2.0 Diesel
Special thanks to: Mike L, Gtrippin, IdahoRob, Dmaxstore, HSP, ISSPRO, Yukon, Airdog

LIKE US ON FACEBOOK!
Adrenaline Truck Performance IDAHO ROB 208.685.1000
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