Hey Folks, my 02 4.7 4x4 Quad has a a few problems pop up in the last couple months.

1. Will not start when hot. Wont idle stutters and dies. Let it sit an hour starts fine or nail it with some starter fluid and rev the hell outa it and it'll run

2. No speedo, stalls coming to a stop some times.

Error codes

P0123 TPS Voltage Hi

P0500 VSS not found.

Decided to fix these this weekend, went to remove the VSS sensor on the rear end, and it came apart in pieces, Aha I say, got ya. had to dig the outer case out of the hole, installed the new VSS , disconnected battery and..........still 0500. Later in the day after a run to the parts store, I install a 2nd VSS and.......0500. Connections seem ok. Arrggh Fine I say, time for problem #1, wont start when hot

I thru the day I install, after a few trips to the parts store, MAP sensor, TPS Sensor, IAC motor, IAT sensor and finally 2 O2 sensors.

Problems Fixed=0

Still won't see the new Speed Sensor, Still has the 0123 TPS error and still wont frickin start when it's hot.

I'm a fan of the Dakota's, this is my 2nd, but I'm going nuts replacing all these sensors and fixing nothing. Oh give me the days of my 68 Ford.

Please save my sanity and relationship with my Dakota

Thanks

 

Get a voltmeter and check the voltages at the TPS and VSS [the VSS may not get voltage....I'm not sure], make sure that 5 volts is present at the sensor.

 

Will check the voltage today, No one has run across this before?

 

Check the crank sensor

 

Well, the damn thing runs great when rolling down the road, still wont start when hot. @#$$%^

Looked at the manual, how do you check a crank shaft positioner sensor?

Will hooking it to a code scanner give me any more info then doing the key trick?

 

Pull your battery and check the state of the battery temp sensor under it it helps regulate battery voltage

 

Well, the 'state' of the battery sensor is that it's there and clean.

Ran the TPS test w/ a cold engine

supply 5.16v
output .4 to 3.85v

Will run a hot test later today

 

Well still fighting the same problems! Tore down and cleaned the Throttle Body, was nasty. No help.

Still won't start hot.

Still no Speedo after replacing 2 Vss sensors.