2003 ford Taurus DHOC 3.0 There is no spark to the coil pack. Code says Misfire #3 at start 1000 rpm's Pulled plug placed near ground turned key no spark Replaced coil Pack Replaced crank sensor still no spark Engine cranks no spark. checked all wires no spark. Guessing PCM where is it located and how do you check it? What else could cause this and where is the PCM located? Must it be new or can I use one from another car?

Hi.

The PCM is located in the rear right corner of the engine compartment, sticking to the firewall:


The PCM can be replaced with a new or used god-working one. In both cases the PCM must be reprogrammed using a Tech 2 tool that costs about $3000. The operation is done at the garage.

The PCM is unlikely causing misfire on a single cylinder. Check wires going to spark plugs. If the coil is getting no 12V on the ignition side check ignition. It is strange that one coil has no power, the engine usually does not start when that happens because the same coil gives power to spark plugs on different cylinders.

Check if there is a capacitor fixed to the head aside the coil (there should be one). It should be cylindrical and one inch long, held by a single screw and located aside the coil. If there is a capacitor, that must be replaced with the coil. If you have not replaced the capacitor that is probably involved in the problem.

If you have already replaced crankshaft position sensor, check crankshaft position sensor harness in PCM. I uploaded here the bulletin with CKPS to PCM testing:2003 Taurus CKPK PCM testing.

Test the PCM and CKPS connectors. Check again voltage to coils and spark plug cables. I understood that spark plug cable nr.3 has no spark from coil. Check DC in from ignition to coil.