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Originally Posted by FrostyTech
Greetings,
Any help would be appreciated cause I don't want to spend any more money until I know the exact source of the problem.
Do car shops with code readers provide more detail as to the source of CEL codes?
Thanks
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Not with this code and not on your car. A scope would rule out any ignition cause for it, but it's probably safe to assume it's not gonna be an ignition issue, based on what you've said.
I think I'd look for a vacuum leak localized around the #1 cylinder. If your EGR resides close to #1, then yeah, it might be suspect, but usually when they hang open with closed throttle (which causes lean misfire) that causes idle instability, i.e. when you drop the throttle and come to a stop, it wants to idle rough or even die, and this isn't the case here.
But if it feeds closest to #1 and it was stuttering instead of snapping shut instantly like it's supposed to when the throttle is dropped, I could see where it could cause a lean misfire momentarily on one cylinder. It wouldn't be the passage crud doing it, but the valve itself. You can remove the EGR and clean it up and rod out the passages (suck the crud you bust loose out with a shop vac), make sure the pintle moves smoothly and seats straight...etc. Might get lucky and that's all you gotta do..
Crank sensor is at the heart of how it detects misfire...it reads crank position and as it does the PCM anticipates how long it should take for the next angle to be sensed...a misfire causes a slight discrepancy in the time it takes for the crank to rotate through that cylinder's firing stroke, and the PCM calls foul if it sees over a preset amount (don't know how many on yours, but usually 20 or more) of crank decelleration at one angle.
But in general crank sensors are either bad or they are not. They are just a simple inductive coil, and if the winding breaks, the sensor fails. They will sometimes fail when hot and the winding is broken, only to make contact again after cooling down. I can't see any way one could fail where it was indicating a misfire in one cylinder...if it was coding for multiple random misfire/all cylinders or something yeah, then I might suspect it if the car ran perfect.