I was just watching one of Diesel Tech Ron's videos on diagnosing 6.0 power strokes https://www.youtube.com/watch?v=xbKZ50x4_go . According to this when you're looking at the cylinder contribution with the Snap On software the vehicle PCM (or FICM) is adding fuel (compensating) to the cylinders that are not contributing equally in order to keep the engine smooth. But with the Ford IDS you have the option to put the PCM in a mode where all cylinders get equal fuel (injector on time). This would be a helpful addition to help in diagnosing injector deficiencies.
6.0 Power Stroke Cylinder Contribution
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BoB, with the ids testing the injectors/balance test, the first screen shows all 8 injectors with the pcm compensating for week cylinders or injectors. when you click the injector icon and change the screen to be able to cut the injectors out one at a time, this takes the compensation away and will show low or high injector balance rates. when you use the snapon scanners the compensation is taken away already, no need to have a different screen. it will shows what injector is over or under fueling. -
Thanks for the reply. So with the Snap On scanners when you view the data on the cylinder contribution or balance test, the PCM eliminates all fuel compensation ? I should make it clear that I'm talking about the snap On Cylinder Contribution Functional test data and not the Injector Kill test.Last edited by greasybob; 09-10-2015, 01:55 PM.Comment
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Thanks for the reply. So with the Snap On scanners when you view the data on the cylinder contribution or balance test, the PCM eliminates all fuel compensation ? I should make it clear that I'm talking about the snap On Cylinder Contribution Functional test data and not the Injector Kill test.Comment
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Joe"You don't build a reputation on what you're going to do"
Henry FordComment
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HI joe, on the 6.0/6.4 and 6.7 when you view cylinder contribution the compensation is turned off so we can see what cylinder is being added to or subtracted to. the 7.3 powerstrokes work different, we look at the perdel pids. these data pids only work at idle, what we are seeing is percentage of crank deceleration or crankshaft velocity change. the perdels help pinpoint a week injector/cylinder.Comment
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HI joe, on the 6.0/6.4 and 6.7 when you view cylinder contribution the compensation is turned off so we can see what cylinder is being added to or subtracted to. the 7.3 powerstrokes work different, we look at the perdel pids. these data pids only work at idle, what we are seeing is percentage of crank deceleration or crankshaft velocity change. the perdels help pinpoint a week injector/cylinder.
Joe"You don't build a reputation on what you're going to do"
Henry FordComment
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An example of viewing cylinder contribution as engine load during the injector kill test. The test was run the same for cylinder 3 as it was for cylinder 8. You can barely tell when injector 8 was disabled. 03 F250 6.0Comment
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