Join Date: Jun 2008
Location: Brampton, Ontario, Canada
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Okay, let's get one thing straight. There is no cut and dry simple procedure for diagnosing bad injectors on these things. There are numerous stages of testing to determine faulty injector(s) on these trucks. Yes, you can run an injector buzz test using Ford's IDS or most generic scan tools. However, that only tests the electrical side of the business . If a code is flagged to specific cylinder(s) for low/high circuits, that only narrows it down to either the FICM, the injector harness, or the injector itself. For what it's worth, I had one truck that passed the injector buzz test, but only heard a mechanical response from TWO out of all eight during the test. Yes, that's right NO codes. Sure enough, plugging in six new injectors into the the non-responsive holes fixed that truck. But this was not before I had to verify the FICM was functioning properly, by plugging in my spare "tester" FICM to verify.
If you are getting CONTRIBUTION/BALANCE codes, than you would need to run a power balance test (on a cold engine), to determine to low/non-contributing cylinder, which would need to be followed up with a RELATIVE compression test. If this test were to reveal "low" cylinders, this would then mandate a MANUAL compression test to verify that a base engine concern does in fact exist. If both relative and manual compression tests were to reveal equal on all eight holes, then and only then can you condemn the faulty injector(s) (provided the FICM and circuitry tests out good).
There is also the possibility of compression gases leaking past the copper washer, which if testing were to reveal this to be the case, ALL four injectors on that bank would need to replaced.
All that said, do you still feel that $300 sounds like a "hose job" to you? How much time would it take YOU to perform these tests?
Ford Diesel/Senior/Master Tech who placed 2nd overall in Ontario on the Fix-It-Right-First-Visit score for 2010
....who works at a dealership that now employs SOME half decent looking female employees since they overhauled most of the administrative staff
....but STILL loves hot women with big boobies
....and STILL hates working on E-Series with 6.0L