Slight Miss With Smoke - Ford Powerstroke Diesel Forum
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Old 10-17-2010, 03:42 AM
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Slight Miss With Smoke

Hi I'm kind of new here to the 7.3 but I need some help. I purchased & 02 F250 with mileage unknown. dealer said he thought it had a bad injector or 2. turns out he was right, I replaced 2 injectors after CCT # 7 & 6 plus new CPS. truck runs a whole lot better but it still smokes when cold & miss gets better as it gets hotter but does not go away. If I flat punch it from a idle it will put out good amount of smoke, seems like its running rich if I can describe it that way. so I decided to do a compression test and this is what I found . #2 -lbs #4-400 # 6-300 #8-300 is this bad a 100lb difference. is the motor shot? it seems to have power when I drive it minus the miss. I stopped here didn't do 1 3 5 7 to I find out from u guys with experience
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Old 10-17-2010, 07:06 AM
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You're looking for consistency across all 8 cylinders in both the procedure you're following and the resulting numbers. take all 8 GP's out (Since they have to come out anyhow, and it will make cranking the motor much easier) Turn it over between 5 - 7 times and get your numbers.

400 - 425 is the Ford spec, but most trucks with lots of miles will have a lower reading. As long as they are all about the same, then you should be fine.

If possible have someone else turn the engine over while you are watching the gauge come up. Hold it after the last crank to see if you have any bleed down on the gauge.

I would estimate a 20 psi variance is acceptable for a daily driven truck.
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