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Discussion Starter · #1 ·
I purchased a 1992 Golf last night on the assumption that it would pass CA Emission testing. I am currently in an Enhanced Area and the car failed the test miserably.
The HC readings were slightly over the limit at both speeds, but the NO readings were over 2.5 times the limit at both speeds. I guess the car is now a Gross Polluter in CA.
Does anyone know what would cause these kind of readings?? Is it as simple as an Oxygen sensor??
I really need a car right now, but I am considering just returning it and trying to find another one.
Any advice is appreciated.
 

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Re: What causes high emission readings?? (MAtkisson)

High HC (hydrocarbon) is caused by a rich mixture / failing converter or both. Could be as cheap as a $10 coolant temp sensor or could be as expensive as a $300+ cat.
 

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Re: What causes high emission readings?? (gearhead455)

quote:[HR][/HR]High HC (hydrocarbon) is caused by a rich mixture / failing converter or both. Could be as cheap as a $10 coolant temp sensor or could be as expensive as a $300+ cat.[HR][/HR]​
Thanks for the response........I was more worried about the high NO readings.
From what I have learned, this might be caused by High Compression. Maybe a lot of Carbon Buildup??
 

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Re: What causes high emission readings?? (MAtkisson)

could be your cat, I would start with checking your O2 sensor often enought it is the culprid, also get your Mixture checked could be a little high, if those both check out then your cat will need to be replaced.
 

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Re: What causes high emission readings?? (ATS)

if it was close you can probably pass by using the lowest octane gas possible(87?) and getting your car really hot before going in. Just drive around for like 20 minutes at high rpms then get tested. I've heard of people putting alcohol in their tanks to pass, but i wouldn't recommend it. Also, there is this fuel additive at NAPA that guarentees you'll pass or double money back. Those are some cheap ways to pass, if they dont work just do the stuff everyone else suggested.
Trust me, I've had some dirty cars.


[Modified by Gaffle, 7:12 AM 8-8-2002]
 
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