hello i bought my dakota from a guy for $150. as u can guess it needed a bit of moter work but nothing mager yet alltho it took a bit to get it to start it to get it home . well it a late modle 90 w/ 91 moter factory, 3.9 when i bought it the guy told me that it had a bad Ignition Oil Pressure Switch. I sort of skiped that sofar and replaset spark plugs, wiers, starter, coil, distributor cap and roter sins it needed all that anyway it started fine. The next day i changed the oil and filter and after that it wont start i checked and saw ther was no fuel going thrue the throttle body so i sprayed some starter flued in it and it started and ran no probb. So could it be the Ignition Oil Pressure Switch

 

I've never heard of an Ignition Oil Pressure Switch (well, as far as cars are concerned...). I've heard of oil pressure switches, just to tell you the oil pressure, but not one that would not allow the engine to start.
From what you said, "i checked and saw ther was no fuel going thrue the throttle body" I would think this is a fuel pump or fuel pump related problem.

 

see i thought that to untill i sprayed the starter flued, the truck started and fuel flowing and worked fine and i hadnt heard of Ignition Oil Pressure Switch eather but thats all i can find at checker when im looking for the oil pressure sending unit and i was thinking it might just be so bad that the emrgincy shutdown relay is getting a signal to not start ^ is what the guy i got it from said it was
im also geting a code when i flip the ignition 5x, 1 dodge teck said it hasnot worked sins the 85 model and told me i need to bring it in to put a computer to it but a dodge cummings teck told me it would work so hears the # 1 2,1 1,4 1,3 3,5 5

 

Codes defined:
12 - Battery power to the PCM was disconnected within the last 50 key-on cycles (no action needed)
11 - Intermitteant loss of Crankshaft (CKP) or Camshaft (CMP) position signals (this will not allow you to start); or no crank referance signal dtected during engine cranking; or CKP sensor target windows have too much variaton
41 - An open or shorted condition detected in the generator field control circuit
33 - An open or shorted condtion detected in the A/C clutch relay circuit
55 - END OF CODES

Since throwing a code dealing with the CKP or CMP, I would check the wiring associated with these. (See pictures for wiring diagrams, and wire-color chart) (Check for good wiring condition, and no corrosion, etc.)
You can also do a basic test of the CKP sensor (pictures). But, since the code says its intermittant, who knows.
I highly doubt the oil pressure switch is tied into not allowing the engine to start, but, thats just me.
Note: this info comes from my 1996 Dakota factory service manual, things may or may not be differant on yours, however, the operation of the systems would probably not have changed, things such as a wire color may have.
Next post: testing the camshaft position sensor...

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Testing the CMP (pictures)

Note: when these instructions refter to "cavity A-XX at the PCM" the PCM is located on the passenger side of the engine compartment, about halfway between the front and the firewall. It has 3 connectors, and I believe connector "A" is the one at the front. If you disconnect the connectors, some of the pins should be inscribed on the connecting side of the connector.
Make sure you check all the pins for bent pins, corrosion, etc. ALL connections MUST be clean, corrosion free, etc.
If you have an automatic, it could be an iffy park/neutral switch (if the tranny is in gear any gear but park or neutral, it will not allow you to start), or if you have a manual transmission, an iffy clutch pedal position switch (however, if the engine turns over in all these cases, but does not start, it is NOT THESE!)
I would not dobut it is the crankshaft position switch, truthfully.
Like I said, I doubt they wired the oil pressure switch so that it will not allow the engine to start.
Post back with results.

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Code 11...IGN reference signal No distributor reference signal detected during engine cranking.
This code is almost always a bad Camshaft Postion Sensor/Pick up assembly in the distributor. If the computer does not see pulses from this Sensor it will shut down the ASD relay and all power to the fuel pump and coil.

Code 41...An open or shorted condition detected in the generator field control circuit
This is a charging circuit problem...the voltage regulator is in the computer.

33 - An open or shorted condtion detected in the A/C clutch relay circuit
If you dont have A/C you will always get this code.

 

well thanx i havent checked it yet bin a bit busy but im about to go and take a look
will keep u posted

 

well im having a hell of a time finding that ckp dosent seem to be ether of the places that the pic says but i fig on checking the cmp sins it kinda sounds like its pointing that way and its a cheper repair will try to get some pics up tonight kinda show ya what im working with

 

I don't think the V6 used a crankshaft sensor until 1992.

 

You know, I was doing some research, and it could very well be that way.
The last year they had Throttle-body fuel injection was 1991. (They switched to multi-port fuel injection [where they have fuel injectors] in 1992)
The PCM uses the crankshaft position sensor to determine, pretty much, when a spark plug or fuel injector event is required. (However, on the other hand, the PCM uses the camshaft position sensor to determine correct injector firing order).

It would be my thinking (of course, I can be wrong!) that if he has a cam sensor, he would have a crank sensor. But, like I said, I can be wrong.
Autozone lists cam sensor as "Not required" and crank is available, and OReilly lists both cam and crank as available. (1991 Dakota, 3.9L)
Hmm...