Passing TX emissions test...help......

Discussion in '94-95 5.0 - Specific' started by TX_Snake, Apr 25, 2016.

  1. TX_Snake

    TX_Snake New Member

    Messages:
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    Joined:
    Oct 16, 2014
    Location:
    Dallas TX
    95 Cobra, all stock. 200k.
    Since the second test I have replaced the spark plugs, cap, rotor, wires, fuel filter. Car has a functioning EGR valve. I have not been able to go retest the car since the tune up.
    I want to check my smog pump for functionality, but unsure of the test procedure. I'm trying to not have to buy new cat's if I can help it...

    Any ideas? Tips, hints, help in general?


    Initial test results were with O/R H pipe ( I didn't realize the car did not have cats..)

    High Speed Emissions Results (25mph)

    Standard Current reading
    HC(ppm) 108 136 FAIL
    CO(%) 0.60 1.07 F
    CO2(%) no std given 10.50 F
    O2(%) " " 6.4 F
    NOx(ppm) 751 1179 F
    DILUTION(%) >6 11.6

    Low Speed Emissions Results (15mph)

    Standard Current reading
    HC(ppm) 112 198 FAIL
    CO(%) 0.62 0.93 F
    CO2(%) no std given 10.6 F
    O2(%) " " 6.3 F
    NOx(ppm) 829 1424 F
    DILUTION(%) >6 11.5

    SECOND TEST WITH OEM CATTED H-PIPE (4 CATALYTIC CONVERTORS ON OEM H-PIPE)
    *Performed at a different inspection station as initial station machine stopped working

    High Speed Emissions Results (25mph) @ 2388 RPM
    HC(PPM) Standard Current reading
    HC(ppm) 117 141 FAIL
    CO(%) 0.65 1.08 F
    CO2(%) no std given 11.5 F
    O2(%) " " 4.5 F
    NOx(ppm) 821 1036 F
    DILUTION(%) >6.0 12.58 PASS

    Low Speed Emissions Results (15mph) @ 2427 RPM
    Standard Current reading
    HC(ppm) 120 151 FAIL
    CO(%) 0.67 1.00 F
    CO2(%) no std given 11.5 F
    O2(%) " " 4.5 F
    NOx(ppm) 907 1032 F
    DILUTION(%) >6 12.5 PASS
     
  2. TX_Snake

    TX_Snake New Member

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    Joined:
    Oct 16, 2014
    Location:
    Dallas TX
    Ran a self test, got 564, 721, and 821. 90/90 on cylinder balance test ran 2x. Got a check eng light on while driving home down the highway for a few min then it went off. car ran normal. also have a surging idle even with a new IAC. Surging idle also came on recently, IAC was replaced a month ago and has been running normally until last 2 weeks.