5.9L Engine Club
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Record Breaker
Joined: Nov 2006
Posts: 2,400
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From: fredericktown
shiloh you need to check your plenum.
gtup: you could still have a bad plenum, you need to do a pressure check. its the best way to test for bad plenum. ive read about it and its the preferred method, but.. i dont remember where i read it and i dont know how to do it, so im pretty much useless...
oh and to make everyone happy, i took a little trip yesterday, filled up my tank and drove 20 miles down a curvy hilly highway to my buddys house. be4 i left my town i reset my overhead avg mpg. got to his house and the avg was 19.4 mpg. although i drove very light footed like a 90 year old grandma, probably never happen again. lol
gtup: you could still have a bad plenum, you need to do a pressure check. its the best way to test for bad plenum. ive read about it and its the preferred method, but.. i dont remember where i read it and i dont know how to do it, so im pretty much useless...
oh and to make everyone happy, i took a little trip yesterday, filled up my tank and drove 20 miles down a curvy hilly highway to my buddys house. be4 i left my town i reset my overhead avg mpg. got to his house and the avg was 19.4 mpg. although i drove very light footed like a 90 year old grandma, probably never happen again. lol
Last edited by nim81; Oct 7, 2009 at 07:06 PM.
I get 8.5 - 9 mpg and sometimes 10 if I drive only highway. It run's great and has tons of power. I have just over 89k on it so idk.
Registered User
Joined: Oct 2009
Posts: 21
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From: Glennville Ga.
New 5.9L Owner
New to it all. Got a 5.9. How does this work? First time to the following....full size truck,V8,Dodge,4x4,horrible gas mileage,rough ride...the list goes on. Wouldn't trade it for anything!
Record Breaker
Joined: Apr 2009
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From: Maine! ( GET A HOLD OF ME IF YOU WANT TO GET ME ON FACEBOOK.COM, AND CARDOMAIN.COM)
X 2!!!!