96 Ranger Smog Fail - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 06-15-2010
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96 Ranger Smog Fail

The check engine light was on in my truck - DTC code P0340 - Camshaft position sensor/synchronizer. I bought a Dorman Sensor and synchronizer assy. that came with the alignment tool, but after reading about the very high failure rate I decided to purchase a synchronizer and sensor from Ford and installed it per the haynes manual. Check engine light did not come back after 75 miles and so I had it smogged.

The truck failed on HC and NO at 15mph. HC at 25mph squeaked by at the exact maximum.

15MPH HC - (MAX 54) (AVE 8) (MEAS 187)
15mph NO - (MAX 527) (AVE 82) (MEAS 584)

Part that bothers me is this:

THIS VEHICLE FAILED THE MIL/CHECK ENGINE LIGHT DUE TO FAILURE TO SUCCESSFULLY COMPLETE ALL OBD SELF TESTS

Anybody have any ideas on where to start?
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Old 06-16-2010
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After clearing the codes , the truck has to be run a minimum of 100 miles at varying speeds for the complete self tests to run.You don't have to drive those miles all at once.25 a day and make sure the engine is at operating temp before shutting it off each time will work.
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