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Author
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Topic: FAILED SMOG
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87_ssp
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Member # 11152
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posted
 
 
I took my 90 fox to get sniffed today and it failed . I did a tune up changed
Spark plugs, wires, oil ,oil filter , cap n rotor. I didn’t not change the o2s and the catted h pipe is the original. Numbers I failed are
15mph
HC max 85 meas 87
25mph max 67 meas 72
15mph
NO(ppm) max 613 meas 669
25mph max 664 meas 452
I failed those three smog guy said to get new cats. Any ideas ? No codes come up and no CEL .
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1987 SSP
1990 LX Convetible Black on Black
1980 TTop Coupe
Posts: 418 | From: The Valley | Registered: Jul 2011
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Martinna
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Member # 12493
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posted
What is your timing at? Always set it to 7 degrees for smog. Lower timing lowers HC and NO. How long did you drive the car for before testing it? The O2 % numbers can indicate how your cats are performing.
Posts: 1093 | From: City | Registered: Oct 2012
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87_ssp
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Member # 11152
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posted
My timing was at 10 , I did not know I can go lower . And O2 numbers were at 5.4.
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1987 SSP
1990 LX Convetible Black on Black
1980 TTop Coupe
Posts: 418 | From: The Valley | Registered: Jul 2011
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Martinna
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Member # 12493
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posted
Plus or minus 3 degrees timing from 10 is allowed. Lower timing lowers NOx and HC. You always want lower NOx and HC for smog. Pouring a bottle of G2P in your tank with 7 degrees timing and testing your car after a long drive on a warmer day will probably get you to barely pass. Your cats are tired. Post up what happens.
Posts: 1093 | From: City | Registered: Oct 2012
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