KOEO CM Code 211 and 212

[fordgirl]

1995 f150 5.8L 265k

Truck is driving a little rough, but otherwise ok. I ran up the codes and now have CM 212. I have always had code 211 no matter what I replaced and I don’t have a knock sensor.

SPOUT measures 0.2 ohms but my multimeter is +/- ~0.2 accuracy.

Timing checks good: baseline at 10 BTDC and increases 4-6 when SPOUT is in

I tried the wiggle test, but I’m unsure if that circuit is tested for that test.

Cylinder balance test is randomly failing cylinders. The last test failed 1-7. Second more intense test passes all cylinder. Truck seems like it is struggling to idle consistently.

Anyone have any troubleshooting steps besides digging into all that wiring to the PCM?

 

[Fellro]

Found this looking aAaround for info : The 212 would indicate a bad ignition module and or a bad dist stator.

With that, may need a good TFI module or perhaps the distributor pickup coil is failing. The ignition modules aren't the most robust so it may be possible.

 

[fordgirl]

Thanks Fellro. I recently (6/2021) replaced both the ICM and the distributor when I was chasing a random stall. At that time I did have a failed PIP and bought an MSD dizzy. I kept the old ICM as that was not the issue so I can slave it in and see if the truck runs noticeably smoother.

If it’s the dizzy again I’m going to be pissed, that cost a pretty penny.