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> Smog test fail, Catalytic convertor or what??
post Sep 15, 2003 - 11:53 AM
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bigredcelica

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Hi,
I have 1994 St202 Celi with a 3S GE injun with 90K miles. I have recently got a NCT test (Irish road worthiness test) which includes a similar test to the smog emmissions test. My low idle (1000 revs) showed fine but my high idle (2750 revs) came in over spec. The standard is 0.3 where my results were 0.4 These are ppm results, or a multiple of, for CO or Carbon Monoxide.

I brought this to a garage where the emmissions showed results of 0.005 for high idle but as soon as the revs were dropped the result shot up massively for a few seconds. He tells me that the cat is gone (nine lives my ass). Is he right? I wouldn't be very trustworthy of his business and need verification before buying. I don't partiucularly want to go down the road of adding Ethynol or such like to the fuel just to pass - I would rather get the car as it should be.

Any thoughts?
 
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post Sep 16, 2003 - 10:33 AM
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97GTinKC

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Considering my car has 90K on the clock I might be as well changing out the cat but curiosity is getting the better of me as to how a sensor can affect the emmissions.


ECU (computer) takes O2 sensor readings (and other sensors like mass air flow, temp, throttle position etc) and tells injectors how much fuel to inject.

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