2004 EB 5.4 Stalling when cold P0320 & P0351-P0358 Can't find the short

[tswinehart]

Yeah, I'm using an OBDLink EX and FORScan. I haven't been checking fuel trim lately, I've had all the misfire pids and some rpm and cam sensors. Will throw fuel trims back in. One thing I can't figure out with FORScan (I'm new to it), is how to change the oscilloscope to look at different PIDs when I'm loading and examining an existing log file?

 

[Hamfisted]

Ok, and how's the wiring harness look running from the crank position sensor there at the front of the motor just aft of the crank pulley ? That P0320 code could be the base of all your misfires really. If the harness is damaged, or the crank sensor is failing. Is it gummed up with schmeg like the PCV was ? Take it out and clean it or replace it and clear the codes. Then see which ones come back or how the motor runs.

Crankshaft Position Sensor at Rock Auto






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[tswinehart]

Will your code reader read live data ? Like what are your fuel trims doing ? If you have a laptop and the ForScan app it'll read a bunch of stuff specific to Fords.

ForScan App Download Link

During each of these large spikes, the engine is shuddering, and then at the end it stalled completely

 

[tswinehart]

Ok, and how's the wiring harness look running from the crank position sensor there at the front of the motor just aft of the crank pulley ? That P0320 code could be the base of all your misfires really. If the harness is damaged, or the crank sensor is failing. Is it gummed up with schmeg like the PCV was ? Take it out and clean it or replace it and clear the codes. Then see which ones come back or how the motor runs.

Crankshaft Position Sensor at Rock Auto


View attachment 78581



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Looks like it's blocked by the a/c compressor, so that'll be a littler harder to check. Probably need to get it back on jack stands to get a good look.

 

[tswinehart]

More PIDs I thought could be interesting. Nothing monumental I could glean.

 

[Hamfisted]

I can't tell what we're looking at there. Take a look at the crank position sensor signal, and the ignition coil signals for all cylinders. See if a blip on the crank position sensor signal corresponds to a blip in the ignition coil signal or a misfire.




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[tswinehart]

Can't find any PIDs that are called crank or ignition or coil. I think there is not a PID for them, or it's just apart of some other related PID maybe?

 

[Hamfisted]

My bad. It just shows up under the RPM PID graph. I'm not sure that'll be much help, 'cause of course the RPM is gonna blip during a misfire.
I see a mix of coil colors there on the motor. Who did all that ? Do you know how old the sparkplugs are ?

 

[tswinehart]

Ok, and how's the wiring harness look running from the crank position sensor there at the front of the motor just aft of the crank pulley ? That P0320 code could be the base of all your misfires really. If the harness is damaged, or the crank sensor is failing. Is it gummed up with schmeg like the PCV was ? Take it out and clean it or replace it and clear the codes. Then see which ones come back or how the motor runs.

Crankshaft Position Sensor at Rock Auto


View attachment 78581



.

Man, I was really hoping that was gonna fix it. What a pita to get to lol. No dice though, symptoms are exactly the same. Old sensor was pretty grungy though.

 

[tswinehart]

My bad. It just shows up under the RPM PID graph. I'm not sure that'll be much help, 'cause of course the RPM is gonna blip during a misfire.
I see a mix of coil colors there on the motor. Who did all that ? Do you know how old the sparkplugs are ?

We're pretty sure the plugs and coils have all been changed by my uncle or grandmother at one point or another. Doesn't seem like they were done at the same time though, and obviously not with all the same parts.