Author Topic: Smog gurus  (Read 1315 times)

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emsvitil

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Re: Smog gurus
« on: May 31, 2019, 07:37:56 PM »
Quite awhile ago I found the procedure for how they do the test.

It's been awhile, so my time intervals are probably wrong, but there are 2 dyno tests. (15 & 25)

For each test you have up to 300 seconds to pass.    The 300 seconds are divided into 30 second bins.   


The ECU adjusts A/F ratio based on the first sensor.    The second sensor measures the effectiveness of the cat.     
Didn't think a 91 had 2 sensors...........


Once you pass a bin, you've passed.

So if the cat is warming up during the test, each bin would be getting better than the previous bin.      You got under the limit for a bin..... test over you passed.
Ed
SoCal
86 SR5 XtraCab
22RE  W56B
31x10.50R15

 
 
 
 
 

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