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#1
11-14-2009, 02:40 PM
Hummer Guru
Join Date: Oct 2005
Location: Charlotte, NC
Posts: 2,767
Sudden loss of gas mileage?
When I installed the supercharger, I installed a bigger throttle body. In order to use the bigger throttle body, I installed a little box that basically allows the throttle blade to open 100% instead of only 80%.
The box is a sealed unit about 1.5" x 1.5".... it's not very big but it is sealed.
The day I left to drive my H2 to FL and had the tranny fiasco, I must have accidently pulled one of the wires from this box out of the harness it was attached to.
After some checking, I figured it out, soldered the wire in and everything was fine.
My problem now is I can't get over 8 mpg driving the truck as much like an old lady would. If I drive the truck normally, it's nothing to only get 5.6-6.0 mpg.
I don't know what may have changed and if this box could go bad but there ain't no way my H2 is only getting 8 mpg driving like an old lady.
With this little box and throttle body installed, I could get 12mpg if I drove like an old lady and average 9 with my heavy foot.
Any suggestions?
Mark
#2
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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37x12.50xR17 BFG Mud Terrain's
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#3
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
#4
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
#5
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
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#6
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.
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