2003 Expedition missin on #6 and all others - Page 3 - Ford Forums

eallanboggs · 07-05-2008, 04:42

That's too much of a coincidence. If you have all of those cylinders misfiring you would think P0300(random misfires) would go set too. Try checking the CKP output. It either reports to the PCM or ICM.

MM1jeeper · 07-05-2008, 06:28

Quote:

Try checking the CKP output.

I'm not a real mechanic....what doe this mean?

eallanboggs · 07-05-2008, 07:11

Crank Position Sensor. I assume this is a 5.4 w/COP. You'll need an assistant or a remote starter to crank the engine while you monitor the CKP output. It's AC. I'd pull the fuel pump fuse and run the engine till it's out of fuel before you get under there to check the CKP. Jackstands are a must and a flat level surface. Don't take chances. The CKP is located behind the harmonic balancer. A labscope or o scope would be best, but you can see a low voltage output with a DVOM set on AC. You'll have to backprobe the connector. Also try removing the connector to the CKP and spraying the jack and plug with electrical contact cleaner. I got a dead Lincoln Town Car w/5.4 V8 going this way. You have to look for something in common since your having numerous misfires on different cylinders at the same time. Think fuel or ignition.

MM1jeeper · 07-06-2008, 14:05

Swapped #2 coil (the last bad one) for #1 yesterday. Today got P0301 and P0316(Engine misfire on startup(I think. Can't find this one written anywhere). So the fault followed the coil. Replaced the coil today and cleared all faults. Now just waiting to see if another comes in. Thanks for the reply. I'll keep it in mind if another one shows.

Oh and I have a 4.6 not a 5.4.