I am probably answering my own question but I would like confimation.
In order to confim milage of the ECM it would have to be connected to a computer at the dealer? Right?
Many used trucks list say a 95 with 476,000 miles while possible it is highly unlikely that this is the true milage
What items on a truck can you visually inspect to give a better idea of actuall milage?? OK ,OK! Other than the Odometer. . Thanks
Milage Confirmation
Discussion in 'Ask An Owner Operator' started by 7mouths2feed, Dec 26, 2008.
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You can't confirm the true milage through the ECM.
Unless the truck in question has had a Hubmeter on it since day one. You'll only be able to get an approximation.
You can add 2-6% onto the ECM reading, and get close.
I would be more concerned about engine hours, than milage.Cybergal and 7mouths2feed Thank this. -
ECM is pretty much spot on for this, 2-6% is not much of a difference from the odometer, you might see a couple 1000 miles difference.
Thing is you never know if the previous owner has swapped ECMs himself and the millage will never match that of the truck. So when doing this make sure the serial number in the ecm matches the engine...... Mine sure as hell dont.7mouths2feed Thanks this. -
Drive train configurations are now loaded into the ECM. Any change, will cause a false reading.
Case in point.
Old tires...odometer reads 67 mph
New tires, it reads 64 mph
Old tires - consistantly 6% or more out of route. If you start with 3/4 of tread...and you are still running 3/32...we have a problem with the ECM calculations
New Tires - less than 2% out of route on the same route.
Unless the clock fails, you can't alter the engine run time.
600k at a 60 mph average equals 100K engine time
Add 25% idle time. You know have a truck that has run the equivalent of 750K miles
Add 2% for tire wear over the life. You now have 751k truck.
Milage is only good for keeping track of service jobs, and drive line wear. And we both know few trucks average 60 mph, so that idle time brings the engine (above) wear time closer to 800K plus miles.
When I look at a ECM read out. I looking for several things.
Engine run times.
Over Rev %
Hard Brakes
Max Speed
And of course, the milage. -
I agree to a point, and i do look at hours myself BUT it doesent have that much of a significant difference as you cay.
All the ecm'd trucks i ever bought showed within 5k of the odometer, thats nothing. -
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Only cummins engines do that anyway
Im well aware of this idling wives tale. I still went over a million with all my equipment, i idle when i need to and dont care, my engine doesnt spit oil out of the blow by tube, it doesent use oil when idling, and dont load up with fuel, its all in how you take care of it and condition on injectors. Of course if you leave it idling for 10 days at 700rpm you will #### it up but not a few hours spaced out over years. -
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And i agree with it to a certain point, but there are to many variables that can be thrown in to the mix to make that statement somewhat untrue.
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I was brought up doing engines based on hours ran. Drivelines, on miles ran.
Others do it all on milage.
If it works for you. Go for it.
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