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Well one day it showed up when I took a trip and I knew how far the mileage was and found out the odemeter was stuck. It did not affect the speedomter part but the mileage it did. Took it out and blowed it out with air, (was gonna get a new one, but whew $500.00 for that, I figured I didn't need it that bad) but anyway after I blew it out with air real good it has worked great.
Not saying it is your problem, but after all I spent and then found it to be the problem was a real funny thing except for my billfold was alot lighter.
I would get the cat people to run the computer on it and see what the mpg is showing and any codes it may have (you can check for codes as well) On mine I turn the cruise off and hold down the resume button and then it will start lighting up, 5 blinks and pause 5 blinks more means nothing is wrong.
The computer might be able to show when the fuel mileage started to drop, and unless it has been cleared it will show what the fuel mileage was from way back.
Thanks Papa Rick i just got it back from cat on mon.The transfer pump was going bad no fuel pressure .They did an overhead even though i had one done about 90,000 miles ago.I was told all the valves were to tight on the motor. Only put about 1000 miles on it since getting it back and i got around 5.5 mpg 1st tank and its running stronger so will see what happens.Originally Posted by Papa Rick
Not saying this is your problem, but I have a W900L Daycab, Cat C-15, my mileage started dropping off the charts and done everything I knew to do. The computer still showed getting 5.5 mpg but according to everything else it was showing 4.0 to 4.3 mpg. Changed all filters, had air to air checked, did overhead, ran dyno and checked for turbo boost, fuel pressure, drained my tanks thought might be getting water in them real bad, done more stuff to it and spent over 2,000.00 and still nothing.Well one day it showed up when I took a trip and I knew how far the mileage was and found out the odemeter was stuck. It did not affect the speedomter part but the mileage it did. Took it out and blowed it out with air, (was gonna get a new one, but whew $500.00 for that, I figured I didn't need it that bad) but anyway after I blew it out with air real good it has worked great.
Not saying it is your problem, but after all I spent and then found it to be the problem was a real funny thing except for my billfold was alot lighter.
I would get the cat people to run the computer on it and see what the mpg is showing and any codes it may have (you can check for codes as well) On mine I turn the cruise off and hold down the resume button and then it will start lighting up, 5 blinks and pause 5 blinks more means nothing is wrong.
The computer might be able to show when the fuel mileage started to drop, and unless it has been cleared it will show what the fuel mileage was from way back.