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Old 10-15-2013, 09:21 AM
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Random CEL and engine roughness

Recently, my 97 7.3 has been having some weird startups. Sometimes it will start and miss roughly and starts knocking. It throws a CEL, but im afraid to run it long enough to hook up my scanner. Once you turn the truck off and start it again, it's fine like nothing happens. It also only does this after the truck is warm and has been driven. Any suggestions on what this could be?
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Old 10-15-2013, 10:01 AM
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Ya know,,, just because the light isn't lit doesn't mean the codes isn't stored...

What kind of scanner are you using? Most don't read our trucks properly as they are Not, specifically, OBD-II.
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Old 10-15-2013, 10:58 AM
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Just an actron pocketscan. I'm just afraid to leave the truck running like that when the CEL is on because it might damage the engine. For some reason when i plug in the scanner, the truck lopes hard.
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Old 10-15-2013, 11:41 AM
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Get a better scanner, that thing is pretty much useless for us....
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Old 10-15-2013, 02:11 PM
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Will do, thanks for the help man.
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Old 10-15-2013, 03:55 PM
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What you're going to need is access to a Professional Scanner (Snap-On, Matco, Ford, etc) or, as most of us here use, the AutoEnginuity w/Enhanced Ford Package (@350 you supply an old computer, it doesn't need much).
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Old 10-15-2013, 05:12 PM
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So if I were to take it up to our local mechanic, would his $2000 computer be able to read codes that were thrown earlier? I just don't know if the truck has to be acting up and the CEL to be on to read the codes.
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Old 10-16-2013, 06:54 AM
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If you had a light on that effected the way the engine ran then that codes was written to the PCM and stored in memory there. It stays stored there for quite some time and can be retrieved, with the right scanner, later (it's how the system works, what good would it be if you took your truck into the dealership because you saw a light a couple of times but it wasn't On right now??)

IF your "local mechanic" has the right equipment that's loaded with the right software (for FORD specific diesel & proprietary codes) then YES! He should be able to use it to get those stored codes for you and point you in the right direction as to what set them. Basically, a code get's created when the PCM "sees" a sensor or module with a reading that's out-of-spec. Finding out what that was is the best way to direct you in repair without going over unrelated areas or buying parts you don't need
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Old 10-16-2013, 07:45 AM
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Thanks for the help man. Talked to the mechanic this morning and he told me it was symptoms of a bad injector. Will invest in a better scanner!
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Old 10-27-2013, 08:16 AM
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If you are facing CEL...
Must see this Flashing Check Engine, Check Engine Codes, Trouble Codes, OBD2 Codes, Diagnostic Codes - CheckEngineCode.com
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