There are a couple of other ways to set your fuel sync without the scan tool as well. Start by setting your dizzy and rotor as pictured in the post by moparite. That should have your engine at TDC on the compression stroke.
Next, advance your crank another 17.5 degrees. This is easy to do, because on your harmonic balancer, there is another timing mark labeled "V8". Line up the Timing mark on your timing cover with the V8 mark on the balancer. Important! If you go past the mark, you must rotate the engine the other way (counter clockwise) quite a bit, and then go back to your mark. It is essential that you land on your timing mark while rotating clockwise, to keep proper tension on your timing chain, and the proper relation to the camshaft.


Next, loosen your distributor hold down bolt enough to allow you to rotate the distributor by hand, but not so loose it will move by itself. Rotate it as far clockwise as the dizzy hold down bracket will allow.


Turn your key to the "on" position.


Very slowly, move the distributor counter clockwise until you hear the ASD relay "click". The sound will likely come from your underhood fuse block. It might be helpful to remove the fuse block cover to help you hear it easier.


If you go past the click, back it up, turn the key off and then back on (it will only click once per key cycle), and the start over rotating the distributor counter clockwise.


Tighten down your distributor. You are at "0" degrees.


The other way to set it is to do all of the same steps as above, except, instead of just listening for the ASD relay, you will check for a voltage fluctuation in the wire connector for the distributor.


Use a needle or a paperclip to backprobe the grey w/ yellow tracer wire coming from the distributor and connect the positive lead from a multimeter to it. Ground the negative lead.


With the key on, as in the steps above, rotate the distributor slowly counter clockwise.


You will see the voltmeter jump from 0 volts to around 5 volts. It is not a gradual jump, but rather instant. That is your "0" degree setting. If you are also listening for the ASD relay... You should hear it and see the voltage jump at the same time.


With a steady hand and patience, you can get fairly accurate doing this. Knowing that I was going to have access to a scanner to adjust it, I decided to experiment with the other methods I mentioned. Each method got me within 2 degrees of "0". This is well within the acceptable operating range.

 

Would fuel sync make an engine not.runs at all ?

 

Absolutely.

 

The cam position sensor not only prevides the pcm with an input for the fuel sync. The pcm needs to know when to fire the plugs on the compression stroke. Takes inputs from both crank and cam sensors to determine this. The crank needs to make one complete rotation before it will fire the coil.