Join Date: Nov 2008
Location: Atoka, TN
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My truck (2001 F250, 272k) was also showing a cyl #8 contribution fault on AE with a dusted motor (75psi on cyl #8, approx. 350 avg. on the other 7 cyl).
I ran the test on my other truck (2000 F350, 345k) and also got cyl #8 cont. fault. This truck is 100% stock and runs good. I did not do a compression test on this truck.
Neither truck was showing a MIL.
I bought a replacement engine from a late 99 E350 Van with 245k on it. I drove it before the engine was pulled and it ran strong (totally stock). I wasn't sure if AE would work on it, but I ran both "buzz" and "contribution" tests and both were fine with NO cyl. #8 fault. The (VAN) motor has all 8 AD injectors, the trucks have the AE in cyl #8.
I hope to have the (VAN) engine installed this week and will probably be posting lots of questions if I have problems (I'm totally new to this 7.3 world).
I am very grateful for the vast amount of knowledge on this forum.
I have read on this forum and others that cyl #8 fault is somewhat common.
2001 F-250 273k miles, Extended cab, long bed, CCV mod., replaced dusted engine with 99 E350 engine.