Hi. Here is my situation and any suggestions would be grateful. I tested my 96 mazda 626 v6 and it failed on the NO (PPM) for the 15 mph section of the test. I changed the PCV valve, had a oil change and filled it with Premium Unleaded fuel. Had it retested, passed the NO(PPM) but failed the HC(PPM) section of the test. Here are the results of both tests
M1: 15 MPH MAX 60 AVE 9 MEAS 43 PASS
M1: 15 MPH MAX 459 AVE 57 MEAS 474 FAIL
M1: 15 MPH MAX 60 AVE 9 MEAS 79 FAIL
M1: 15 MPH MAX 459 AVE 57 MEAS 369 PASS
Any suggestions would be extremely grateful.