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Author Topic: Smog Test Only (FAIL) HELP!!!! gt40 ¯ Member # 3587 posted                                 1990 mustang gt conv. S-trim Vortech E-cam Alum Heads 70 mm tb 70 ma shorty headers Spin-tech dumps %CO2 %O2 HC(PPM) CO (%) TEST RPM MEAS MEAS MAX AVE MEAS MAX AVE MEAS 15mph 2387 11.5 4.3 121 31 119 0.76 0.10 0.14 NO(PPM) MAX AVE MEAS Results 807 237 72 PASS %CO2 %O2 HC(PPM) CO (%) TEST RPM MEAS MEAS MAX AVE MEAS MAX AVE MEAS 25mph 2386 11.5 4.3 96 20 127 0.65 0.09 0.10 NO(PPM) MAX AVE MEAS Results 746 199 75 FAIL -------------------- gt40 Posts: 357 | From: n/a | Registered: Oct 2003  |  : CDT ¯ Member # 5004 posted                                 kinda hard to read your post, you have that the the NO read 75 and has a max of 746 but failed -------------------- Custom Dyno Tuning 510.331.0608 Home of Flat Fee Tuning For All Cars, Trucks and SUV's, EFI & Carb, SCT, AFR, Dynatech, STS Turbos, N2O Refills Posts: 1053 | From: Hayward | Registered: Nov 2004  |  : gt40 ¯ Member # 3587 posted                                 It failed on the 25mph on HC(PPM) which has the max of 96 and the meas is 127. -------------------- gt40 Posts: 357 | From: n/a | Registered: Oct 2003  |  : CDT ¯ Member # 5004 posted                                 check the basics, plugs and wires, oil should be clean. Might just have too much timing in that area. -------------------- Custom Dyno Tuning 510.331.0608 Home of Flat Fee Tuning For All Cars, Trucks and SUV's, EFI & Carb, SCT, AFR, Dynatech, STS Turbos, N2O Refills Posts: 1053 | From: Hayward | Registered: Nov 2004  |  : MLP ¯ Member # 1660 posted                              I had similar numbers on my 89, although the engine was relatively stock. I had new O2's, and basics (cap, rotor & etc). I got it close using Guarantee to Pass and by getting the engine very hot before the test but I could not get it to pass until I changed the Cat's. Once I changed the Cat's, it breezed right by. Hope this helps. Posts: 15 | From: Sacramento | Registered: Aug 2002  |  : jaybquick ¯ Member # 4286 posted                                 your O2 quanitties are pretty high, when cats are weak these come up. Good working cats use up the O2 to burn the other 3. -------------------- 91 Mustang GT ET: 11.92@115 66 Mustang ET: 11.43@119 01 Audi S4 ET: 10.8@131 05 Audi S4 ET: 11.9@116 08 Audi S5 ET: 11.9@118 Posts: 416 | From: Lathrop | Registered: Mar 2004  |  : Motorhead6T5 ¯ Member # 4969 posted                              Methenol is your friend -------------------- 65 Fastback 72 Malibu Posts: 1230 | From: 530 | Registered: Oct 2004  |  : gt40 ¯ Member # 3587 posted                                 I appreciate all the advise!! -------------------- gt40 Posts: 357 | From: n/a | Registered: Oct 2003  |  :

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