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#1
11-14-2009, 05:50 PM
Hummer Veteran
Join Date: Sep 2006
Location: San Diego CA
Posts: 203
Re: Sudden loss of gas mileage?
i had a bro with the same problem with his dodge ram.
turns out the plugs were the problem, they pulled them and they had to much gap, change them out with the correct gap and like new again.
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2006 Yellow H2 Lux Series
Front 2.5 X 7/8 Remote Reservoir Fox Shocks
Rear 2.5 X 7/8 Piggyback Reservoir Fox Shocks
37x12.50xR17 BFG Mud Terrain's
Ready Lift Front Leveling Kit 2 1/2"
Cognito Steering Support Kit
Cognito Idler Pivot Kit
Fabtech Steering Stabilizer
Fabtech Tie Rods
Power Slot Slotted Rotors
Crown Performance Stainless Steel Braided Brake Lines
Off Road Unlimited Black Diff Cover & RP Diff Fluid
Hypertech Power Programmer
True Flow Foam Air Filter
#2
11-14-2009, 07:04 PM
Hummer Expert
Join Date: Sep 2005
Location: "Live Free or Die"
Posts: 657
Re: Sudden loss of gas mileage?
5-6 mpg is pretty dramatic. Is that what your DIC is saying? Are you actually getting 5-6mpg?
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2006 H2 SUT Fusion Orange LE
#3
11-15-2009, 06:24 AM
Hummer Guru
Join Date: Oct 2005
Location: Charlotte, NC
Posts: 2,767
Re: Sudden loss of gas mileage?
Quote:
Originally Posted by Intercooled
5-6 mpg is pretty dramatic. Is that what your DIC is saying? Are you actually getting 5-6mpg?
That's according to my DIC. It's always been pretty accurate so I really didn't have any reason to doubt it.
I'll doublecheck it but I'm thinking I've got some issue somewhere.
Mark
#4
11-15-2009, 05:32 PM
Hummer Expert
Join Date: Jul 2009
Location: ontario
Posts: 780
Re: Sudden loss of gas mileage?
hi is your transmission fixed yet?
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Thanks Tracy
2008 H2 SUV
Starr Hid projector headlights
Hid lights in the DRL bumper holes
Custom Alum. light bar, 2 Rigid Industries 10 inch Leds
MC2 Roof Light Bar
24 inch Starr 770 Hammer Rims
Gen 6 Lockpick
Gm bluetooth
Front + Rear Camera's
73 Duster 588 ci. B1 injected akly with NOS
Supercharged 2002 Harley, E Glide Classic
2005 Screamin Eagle, E Glide
http://twrbaggersplus.com/
#5
11-15-2009, 11:28 PM
Hummer Guru
Join Date: Oct 2005
Location: Charlotte, NC
Posts: 2,767
Re: Sudden loss of gas mileage?
Quote:
Originally Posted by twr
hi is your transmission fixed yet?
Nope...
Took it to get rebuilt. (dropped off trans, didn't take truck)
Took it back with trans in truck, they R&I'd and replace converter and valve body.
Got it back, CEL on again.
Gonna take it back this week.
Mark
PS. It drives and shifts fine, just getting a CEL light.
#6
11-16-2009, 01:54 AM
Hummer Expert
Join Date: Jul 2009
Location: ontario
Posts: 780
Re: Sudden loss of gas mileage?
hi Mark, ok after the trans is fixed check the mileage, not on the trucks computer to see where your at for sure. Then lets us know.
__________________
Thanks Tracy
2008 H2 SUV
Starr Hid projector headlights
Hid lights in the DRL bumper holes
Custom Alum. light bar, 2 Rigid Industries 10 inch Leds
MC2 Roof Light Bar
24 inch Starr 770 Hammer Rims
Gen 6 Lockpick
Gm bluetooth
Front + Rear Camera's
73 Duster 588 ci. B1 injected akly with NOS
Supercharged 2002 Harley, E Glide Classic
2005 Screamin Eagle, E Glide
http://twrbaggersplus.com/
Last edited by twr : 11-16-2009 at 01:56 AM.
#7
11-17-2009, 01:14 AM
Hummer Guru
Join Date: Oct 2005
Location: Charlotte, NC
Posts: 2,767
FIXED!!!
Dropped the truck off this morning and picked it up about an hour ago.
Turns out there was a defective valve (or solenoid) in the pump. It was causing the converter to lock up almost all the time.
I didn't know that would have an effect on mileage but since I reset the mileage and drove about 50 miles, I'm averaging a little over 12 mpg.
I'll check it over the next few days but it appears to be working correctly.
Mark
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