Compression Ignition Addict
Join Date: Jan 2008
Location: Edmonton Alberta, Canada
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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.
05+ coils, 10 Rear diff, box, tailgate, lights, bumper, Full 07 front harley swap...the list is endless.
AS IM RARLEY on here anymore...have a question ?? EMAIL ME
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gladly answer any of your questions. OR search me on facebook. ill help out anyway I can !
updated as of OCT 28/2013