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This vehicle doesn't have a cam shaft sensor such as vehicles that use coil packs do. This vehicle has a distributor and uses a pick-up coil that is internal to the distributor to determine camshaft position. It looks like this:
bernardsblog.blogspot.com/.../dodge-transmission-output-speed-sensor.h... Sep 8, 2009 - The code was straight forward - PO720 - Output Speed Sensor Circuit.... words but if you've never seen the underside of a 1999 Dodge Ram 1500 pickup ...My 99 Dodge 2500 Ram won't accelerate..transmission is NOT ... RR - If the engine revs but the vehicle doesn't speed up then the trans is slipping.
Did you change the spark plugs also ? Could have a head gasket leak between 5 an 7 ! Could have bad fuel injectors , clogged ! What about the speed sensor , you have a DTC stored in memory ,have check engine light on ? Need you to explain this a little better , misfire along with the speed sensor ! What about speed sensor ? You could have a vacuum leak affecting those two cylinders !
You need to check the out put speed sensor (OSS). This is a 2 wire magnetic pick up sensor and is used to measure output speed shaft. This is used to determine proper govenor PSI. This sensor is prone to internal failure and loose ground connection. Here are the location the output is located on the left rear trans. On 4X4 it will be before transfercase. Also If you change ECM put the old one back they have a security vin installed and it will need to be flashed plus it wont match and youll get weird drivability results. Let me know we can fix this together.
P0720 is a code for the output shaft speed sensor on the transmission. If you are handy with a volt/ohm meter you can test the resistance of the sensor unpluged. should be 500-700 ohms. or you can just put a new sensor in, its a comon problem.
Had this exact problem in my shop yesterday. Turned out the connector on the speed sensor on the rear differential was broken allowing it to pull out of the sensor. Cleaned out inside the connectors and tied them together with a pull tie. Problem solved.
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