LB7 Duramax really bad MPG
#1
LB7 Duramax really bad MPG
Hi.
i have LB7 2002 Duramax, itīs a federal motor(no EGR system). my problem is that he spend so much fuel. Mpg is around 8-10 gallons on every 60miles.there is no hard start,black smoke or nothing. when i read it with TECH 2 there is nothing i can see that is wrong or out of specs. I can feel a lack of power but not so much.sometimes on highway driving i can feel missfire or it feels that way. is some that can help me? gallon i iceland is around 8 dollors so this is killing my and iīm starting to hate my DURAMAX.. not good.. hehe...
i have LB7 2002 Duramax, itīs a federal motor(no EGR system). my problem is that he spend so much fuel. Mpg is around 8-10 gallons on every 60miles.there is no hard start,black smoke or nothing. when i read it with TECH 2 there is nothing i can see that is wrong or out of specs. I can feel a lack of power but not so much.sometimes on highway driving i can feel missfire or it feels that way. is some that can help me? gallon i iceland is around 8 dollors so this is killing my and iīm starting to hate my DURAMAX.. not good.. hehe...
#2
it sounds like injector problems. have you checked your oil to see if your making oil? u need to hook the truck up to a good scanner have have the injectors tested
The following users liked this post:
urabus (05-11-2011)
#3
Check to see what your making for rail pressure at idle and wide open throttle. If your pressure is low the truck will not burn the fuel correctly causing a lack of power and milage. If your not seeing a haze(smoke at idle) or fuel in the oil your injectors might be alright. Do a balance rate test. If non of them are + or - 4.0 or higher your alright.
The following users liked this post:
urabus (05-11-2011)
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