2003 Concorde 2.7L for my daughters first car.
The engine had over 200,000 mile on it and was about to throw a rod but ran fine other than that. Found a used/running 1999 2.7 with around 150,000 miles on it and had a friend swap them out. Keeping all of the 03 part on the car (Basically a long block). after the swap it wouldn't start for him.
Asked him to check the reluctor on the cam because i found that they made a change between 99 and 03. It was different and he swapped out the rings. Now it'll start (after a lot of cranking) but is in limp-in mode
Throwing up code P0335 (Crankshaft Position Sensor "A" Circuit).
Replaced the crankshaft sensor (Duralast SU3315)
Now it won't start at all.
Reinstall old sensor and after a lot of cranking it starts.
Checked the wiring - it good.
Check the plug ends (sensor and PCM)- they're good.
Changed cam sensor - no different.
Disconnect crank sensor and the engine starts in less time than with it connected (assuming it's using only the cam sensor for timimg)
Connect crank sensor and disconnect cam sensor - won't start
With it disconnected, I get P0016 (Crankshaft Position - Camshaft Position Correlation) that makes since..
The one thing he did not change was the reluctor ring on the crankshaft.
Is there a physical difference between a 1999 and 2003 crankshaft reluctor ring like there is on the cam?
I have read that a cracked or damaged crank reluctor ring can cause issue but want to eliminate everything before having him split the engine/transmission to replace it.
Any ideas?
Why with a new sensor it won't even start?

 

UPDATE..
Did some e-bay searching
Found the drive plate for a 1999 and 2003
BIG difference.
The 2003 plate has timing notches all the way around the plate with a small section that is solid.
The 1999 plate has a 4-4-5 series pattern .
Looks like my friend gets to do some more work..

 

The cam shaft tone wheels are also different