Yet another..

[Josh P]

F47F-12A650-MB
F47F-12A650-NB

Those are for a 94 auto with federal emissions. It might be possible to use a 93 federal emissions ecm that doesn't use a cam sensor. I've read others have done it.

 

[PNWEx]

F47F-12A650-MB
F47F-12A650-NB

Those are for a 94 auto with federal emissions. It might be possible to use a 93 federal emissions ecm that doesn't use a cam sensor. I've read others have done it.

Like a 93 without the emissions?

 

[Josh P]

Like a 93 without the emissions?

The 93 ecm is similar to the 94 except the 93 doesn't use a cam sensor. I've only read about people doing that, no personal experience.

 

[PNWEx]

ANOTHER UPDATE....


The junk yard pcm yielded the same results.

Code 214

Only seeing 4 cylinders

However, while running the KOER test the code does not present itself

If I clear the code and do the KOER test it shows 6 cylinders and the CEL stays off

If take my scanner off and restart the truck the light pops right back on

 

[PNWEx]

I'm pretty stumped...anyone have any idea what else this could be?

 

[Josh P]

I'm pretty stumped...anyone have any idea what else this could be?

There's only a few things it can be, it's ignition related. One of the other members will chime in once they see this thread.

 

[PNWEx]

Could my timing chain be out of time? I would think that if it were the timing chain with it being a pushrod engine it would have slapped a piston head by now.

 

[Josh P]

Could my timing chain be out of time? I would think that if it were the timing chain with it being a pushrod engine it would have slapped a piston head by now.

No, it is basically an electrical issue.

 

[PNWEx]

So are all 6 cylinders firing and the pcm is only seeing 4?

 

[Josh P]

So are all 6 cylinders firing and the pcm is only seeing 4?

the ecm or icm isn't getting a signal from the cam or crank sensor so it defaults to 4 cylinder operation. I'm not the best at explaining things.

 

[PNWEx]

the ecm or icm isn't getting a signal from the cam or crank sensor so it defaults to 4 cylinder operation. I'm not the best at explaining things.

That makes sense what doesn't make sense is that if the crank wasnt sending a signal then the truck wouldn't start right?

But also itll show 6 cylinders after I run the KOER test once. I've looked at the wires i can see and they look ok.
I've jiggled and wiggled everything.

 

[Josh P]

That makes sense what doesn't make sense is that if the crank wasnt sending a signal then the truck wouldn't start right?

But also itll show 6 cylinders after I run the KOER test once. I've looked at the wires i can see and they look ok.
I've jiggled and wiggled everything.

As an example, if the harmonic balancer is failing, the tone ring can shift. The crank sensor sits at 10 degrees from TDC, if the tong ring shifts, it will still get a reading but it won't be accurate. The crank sensor itself is OK, or the engine wouldn't run, as you stated.

 

[PNWEx]

It

As an example, if the harmonic balancer is failing, the tone ring can shift. The crank sensor sits at 10 degrees from TDC, if the tong ring shifts, it will still get a reading but it won't be accurate. The crank sensor itself is OK, or the engine wouldn't run, as you stated.

How could I check that?

 

[Josh P]

It

How could I check that?

With the engine running, rev it up and look at the harmonic balancer. A good one won't wobble. You rev it up a little cause at idle it can appear to wobbles when it's fine.

 

[PNWEx]

With the engine running, rev it up and look at the harmonic balancer. A good one won't wobble. You rev it up a little cause at idle it can appear to wobbles when it's fine.

Had my wife rev the truck up several times. Even held it there for a few seconds and not even the slightest bit of movement. Belt runs nice and in line. Could the oil pump be going out and causing a malfunction in the cmp?

 

[Josh P]

Had my wife rev the truck up several times. Even held it there for a few seconds and not even the slightest bit of movement. Belt runs nice and in line. Could the oil pump be going out and causing a malfunction in the cmp?

If the oil pump was going out, you'd know it. I think the next step is to test the wiring

 

[PNWEx]

Had my wife rev the truck up several times. Even held it there for a few seconds and not even the slightest bit of movement. Belt runs nice and in line. Could the oil pump be going out and causing a malfunction in the cmp?

If the oil pump was going out, you'd know it. I think the next step is to

Ok. How would I go a out that. I have the wiring diagram.

The ckp has two wires that go to the icm which goes to the pcm and the CMP has three wires one positive (red) which runs to a solenoid, a negative (black) that runs to a ground, and a signal wire that goes straight to the pcm.

 

[PNWEx]

Since 1 and 5 are companion cylinders on the same coil couldn't the ignition coil be bad?

 

[ChildIdenticant]

Since 1 and 5 are companion cylinders on the same coil couldn't the ignition coil be bad?

This would be easily diagnosed by running the engine, then pull one of those. Did the idle suddenly deteriorate further? if yes, reinstall. then perform with the next. Same result of sudden instability? Then the coil , cables, and plugs in those cylinders are very likely not the issue. Maybe try it with all cylinders (one at a time), just to see & compare.
Dish gloves if you don't like electrotickle.

 

[PNWEx]

Grabbed an icm today outta pick n pull. It was a motorcraft and the CMP was a Bosch seems like they had the same problem. But the icm didnt fix my troubles. So I'm going to bite the bullet and take it to a dealership if I can find one that'll mess with it. Thanks for all the help guys.