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Old 08-10-2012, 08:03 PM
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Dont always trust the dealer!

I took my truck in for a diagnosis a week ago and the dealer told me it needed 2 injectors and a ficm. I thought about a for a little bit and ended up taking the truck home and ohm testing all the injectors and they checked out fine. I ended up ordering a new injector harness and already had purchased an ficm so I put them both in today and the truck runs flawlessly.

I'm not saying the dealer was trying to rip me off I just don't think they test the injectors how they should. I'm assuming they check ohms at the ficm plug rather than at the injector which would explain why they came up with 2 bad injectors (some sort of short/open in the harness)

Just a heads up for some of you out there that think the dealer knows all.

My truck was at the same dealer a week before for running rough and rind only dying out. They told me it was a lose plug on the ficm and told me they replaced the plug. 3 days later the truck started running worse and eventually couldn't even hardly move under its own power. That's when I took it back for the diagnosis and they told me it needed the injectors and ficm

Makes me wonder how many injectors have been replace when they were perfectly fine
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Old 08-10-2012, 08:32 PM
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(Makes me wonder how many injectors have been replace when they were perfectly fine)

A bunch of them.
Doug
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Old 08-10-2012, 08:59 PM
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actually the rule is "NEVER trust the dealer"
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Old 08-11-2012, 07:52 PM
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NEVER and only for warranty unless you know for sure they are good.
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Old 08-12-2012, 08:16 AM
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here we go again

a failing ficm can cause individual cylinders to overfuel or de-fuel. Whenever ficm codes are pulled in addition to contribution codes the ficm should always be replaced first and then further diagnostics performed afterwards. It's not impossible to have a combination of both but the ficm should always be changed first to rule out the weird concerns it can cause

ohm testing injectors isn't a reliable way of testing them

Last edited by sinner6.0L; 08-12-2012 at 08:22 AM.
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Old 08-12-2012, 10:06 AM
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Quote:
Originally Posted by lenzhotrod View Post
NEVER and only for warranty unless you know for sure they are good.
And THOSE are the kind of customers that usually end up at "the back of the line", versus the customer paying customers, just so you know.

Quote:
Originally Posted by sinner6.0L View Post

a failing ficm can cause individual cylinders to overfuel or de-fuel. Whenever ficm codes are pulled in addition to contribution codes the ficm should always be replaced first and then further diagnostics performed afterwards.
I can't count how many of these situations I've had coming into my bay. I now make sure our parts department always has TWO FICMs in stock due to the high rate of failure.

Quote:
Originally Posted by sinner6.0L View Post
ohm testing injectors isn't a reliable way of testing them
And for what it's worth, ohm testing any injector will give you the same readings almost always unless there is something electrically faulty on them that has failed. But what about mechanically failed injectors for which ohm testing isn't going to tell you squat?
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