Where is the crank position sensor on my 2004 van

Did you change the PCM - engine computer , crankshaft position sensor , flexplate etc... out of time ,not the engine but crank sensor or the trigger wheel maybe . could be different from one year to the next .

Here's a link to your crankshaft position sensor. Repair Guides Cits on the bottom of the engine block, there is a heat shield covering it, thats why you can't find it, its around the intake manifoldomponents Systems Crankshaft Position Sensor AutoZone com

is it a no crank or crank no start?
Possible causes for code P0335
- Faulty crankshaft position sensor
- Crankshaft position sensor harness is open or shorted
- Crankshaft position sensor circuit poor electrical connection
- Signal plate may be damage
- Starter motor may be faulty
- Starting system circuit
- Dead or weak battery

Read more: http://engine-codes.com/p0335.html#ixzz3Cxw6SN6O

The V6 is on the bellhousing in back of the engine.

P0016 Chrysler

Crankshaft -camshaft timing misalignment bank 1 sensor 1
- The pcm detects that the camshaft position is out of phase with the crankshaft position

Probable Cause[s]

1. Engine oil dirty or contaminated /Incorrect engine viscosity
2. Open or short circuit condition
3. Camshaft 1/1 position solenoid, camshaft phaser ,camshaft1/1 position sensor
4. Crankshaft position sensor ,crankshaft,tone wheel or flex plate
5. Camshaft,tone wheel or pulse ring

For 1991 Dodge Truck Caravan 4WD 3.3L MFI 6cyl the Crankshaft Position Sensor is located: Under hood, center, rear engine area, where transaxle bellhousing meets engine, mounted in engine block.

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it could be the crankshaft sensor.if its bad it wont let fire get to the plugs

The camshaft position sensor is located on the timing cover on the front of the engine. The crankshaft position sensor is located just above the differential on the transaxle bell housing where it has to be to read from the flywheel the position of the crankshaft. It is easy to see from the front of the engine even though it is on the back half. Just look for the shifter cable and where its bracket ends (on the firewall side of the bracket) glance about 12" to the left and you should have no problem finding it. An 8 mm bolt is holding it in and with that bolt taken out it just pulls out of its hole. Google "95 caravan crankshaft position sensor" and then pick IMAGES so you can see an actual picture of what it looks like.