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| 1999 to 2003 7.3L Power Stroke Diesel 7.3L Power Stroke Diesel equipped Super Duty and Excursion. |
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#1
Tue, October 20th, 2009, 01:10 PM
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Diagnosing Miss?
Trying to diagnose a truck. I'll look at it in an hour or so. What would cause a "miss".
These are the first things that came to mind... CPS Low Oil Level Chaffed Harness Clogged Fuel Filter Anything else? 
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#2
Wed, October 21st, 2009, 12:08 AM
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On a diesel? Several things...
Bad Injector Coil Worn Injector Bad Valve Cover Gasket Bad UVC (Under Valve Cover) Harness Leaking Injector O-Rings Low Oil Pressure Low Compression (rings, valves, etc.) Low Fuel Pressure I think the question is, "How bad is the miss?" Is it just a slight miss or is it a dead miss? Has anything been done to the truck recently that could be attributed to the miss? (Changed injectors, valve cover gasket, did an oil change, etc.) On those trucks, always start with a "Buzz" test and "Cylinder Contribution" test whenever possible. They'll at least help isolate the cylinders. Since a miss can be attributed to so many things, it really comes down to vehicle inspection and process of elimination. Good luck! 
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