This is topic Smog Test Only (FAIL) HELP!!!! in forum Tech Talk at Northern California Ford Owners  .


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Posted by gt40 (Member # 3587) on :
 
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
 
Posted by CDT (Member # 5004) on :
 
kinda hard to read your post, you have that the the NO read 75 and has a max of 746 but failed [Confused]
 
Posted by gt40 (Member # 3587) on :
 
It failed on the 25mph on HC(PPM) which has the max of 96 and the meas is 127.
 
Posted by CDT (Member # 5004) on :
 
check the basics, plugs and wires, oil should be clean. Might just have too much timing in that area.
 
Posted by MLP (Member # 1660) on :
 
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.
 
Posted by jaybquick (Member # 4286) on :
 
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.
 
Posted by Motorhead6T5 (Member # 4969) on :
 
Methenol is your friend
 
Posted by gt40 (Member # 3587) on :
 
I appreciate all the advise!!
 




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