HELP sinking feeling in gut after running cylinder contribution test! - Ford Powerstroke Diesel Forum
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Old 11-05-2013, 10:01 AM
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HELP sinking feeling in gut after running cylinder contribution test!

So just when I thought I was done wrenching for a while I ran a cylinder contribution test on my 02 7.3 with 129000 plus a change in rotational velocity test and here is what I got. Please help decipher.
Cylinder contribution test:
P0269 Cylinder 3 Injector contribution circuit/balance fault
P0284 Cylinder 8 " " "

When I replaced my wiring harness and glow plugs a week or so ago after putting the valve covers on I ohmed out the pins to the injectors before plugging back in the UVCH on the top side of the engine and all was good on communication.

I then checked the rotational velocity check and Cylinder three was around 3.5 to 4.2 and Cylinder 8 was around 4.5-5.4 where all others were right near zero like they are supposed to be.

I have read that the grey CPS which in mine is brand new from ford can throw off number 8 readings but I don't know if this is true. I am not blowing smoke on startup or while running and I am getting good mileage and from what I can tell (first powerstroke) the only running sound that is a little off to me is if I am under very light acceleration then it seems as though the "flutter" is a little off sequence but then again I have no cat and straight pipes. Quietest straight pipes I have ever heard by the way.
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Old 11-06-2013, 05:14 AM
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I got this from Swamps site last night and am going with it....essentially I am going to ignore this one and if the issue gets worse I will run a compression test and bypass the dam AE program and possible CPS interference since I cannot get a black sensor anymore.


"Cylinder Contribution Tests can often flag cylinders #1 & #8, or #3 & #8 as both failing the CCT. Anytime #1 & #8 are paired as hacing balance faults...especially on 99-03 trucks, this may indicate a fuel delivery problem (pressure, contamination, etc). The pairing of #3&#8 are “companion” cylinders...so an internal or external engine balance problem will often show up as 3&8 cyls failing balance tests. We have also seen a CPS (camshaft position sensor) show false codes related to cyls 3&8...however if the engine runs normally, then it is our recommendation to simply ignore these phantom codes."
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Old 11-06-2013, 05:55 AM
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Read through this -> Black, Grey, & Dark Blue Cam Position Sensor Perdels Test - Diesel Forum - TheDieselStop.com
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