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The crank sensor on the truck works with the camsensor the crank sensor uses the cam to synchronize and identify where number one piston position is at. It is responsible to fire you injector and for how long is determined by the cam position sensor. On a 96 Dodge diesel the crank sensor is also responsible for you tach reading,your air condition ,and for the alternator.
the crank sensor is on the right(passenger side) rear of the engine block you will need a mirror to see it it is acessed from the top of the engine to remove the bolts you need an extra long 1/4" allen socket it is a royal pain to get to i have changed too many and usually have to find it by "feel"
Were the plugs covered in oil? With the plugs that go through the valve cover you might need new seals. Did you replace the plug wires? You need to scan it for codes. It's most likely a missfire, but it could be a bad speed sensor (also called, VSS vehicle speed sensor, cam position sensor,or crank position sensor).
The "Vehicle Speed Sensor" signal is generated by the transmisson output speed sensor. That is the one located at the rear of the case. It is externally mounted. That supplies "vehicle speed" info to the other On-Board Computers. The input turbine speed sensor is located just behind the bell housing area of the case. I believe the trans controller is the only module that needs that info. The Crank Position Sensor give engine RPM info and it is located on the bell housing near the engine block. I hope this helps.
The sensor is bolted to the top of the cylinder block near the rear of right cylinder head
The sensor is accessed by removing the right front fender liner
Remove right front tire and right front wheelhouse liner.
Disconnect crankshaft position sensor pigtail harness from main wiring harness.
Remove two sensor (recessed hex head) mounting bolts
Need to locate the JTEC controller on motor
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