I have a 2006 9400i eagle that I just got a few months ago. I got it cause every one has told me how good the isx is. when I got it it had a life time average of 6.4 on the ecm. I have just had to replace the ecm a week ago. I have only got 6.4 one day! it has been in the shop more than on the road! what can I do to get it back to 6.4? right now im getting anywhere from 4.8 to 5.7? I rarely haul more than 45,000lbs with a grvw of around 68,000 lbs. I have had to put a butt load of money in this thing. it has just about drained me. I have it in the shop about once a week cause of the codes it was giving me til we found out the ecm was bad. I have put 2 injectors in it a egr valve all new filters delvac oil the over head ran 3 times fuel valves turbo speed control sensor boost sensor. the egr cooler is new turbo accuator is new also. Since we have swapped out the ecm no more codes and no more derating. but now I can only get 5.7! it has a 500hp isx 13speed 342 rears 22.5 wrapped in half woren good year 11r's! I #### at about 1600rpm's and cruise at 1400 rpms witch puts me at 66mph! what am I doing wrong? and what is the best rpm to cruise at! this is my first isx and could be the last. everone I talk to is getting anywhere from 6.4 up to 7.8 hauling the same thing I am and most of the time heaver than I am! any help would be great!
help with fuel mileage
Discussion in 'International Forum' started by s.hitt, May 18, 2013.
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well thanks for the info. but just as my luck has been going lately just a little to late for that to help!lol! I just need to do something befor I lose whats left of my butt! Whats left from my wife getting threw with it!!! I just need to get it to run it to get something out of it! The folks I talked to love this motor! and the mechanics I have had working on it love this motor and say that once I get the thing running right that I will love it too!
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How's your driving style? I don't know what you do now, but maybe you can ease up on the throttle, take a little longer to get to speed, maybe lower your cruising speed. Pleny of other mileage and driving for mileage threads on here, check 'em out and see if you can apply any techniques or upgrades.
KANSAS TRANSIT Thanks this. -
We have a good customer with a moderate size fleet, mostly ISX. He claims he gets the best mileage with the trucks running at 62 mph. 65 or higher it really drops off.
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Maybe consider getting a tune?
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Boost leak ? Mix up some soapy water, or glass cleaner. Set to high idle, and soak all intake hose connections , gasket , flanges, and the charge air cooler. Any bubbles is a leak. Get any leaks fixed. Guessing there is a leak some where ? Good luck!
My brother is buying one of ISX next week. He just will not take my advice ! Do not by any thing from 04 till 2011 ! No matter who made it ! -
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I have a 2003 Int 9400 with a 450 cummins. I am happy with mine. my mpg is in the high 7's, I usually run around 60mph. With some new low rolling resistant tires I could break into 8.
Since you have a 13spd try dropping to 12th gear at 60 for a month. I think 12th would be in direct drive. someone will correct me if I am wrong on that.
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