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Failed emission in CA. New car to me, need help on high NO 91' S4

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Old 03-31-2014 | 05:51 PM
  #91  
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Originally Posted by x98boardwell
I PASSED!!!
Congratulations! That must be a relief.

I changed my plugs (I had Beru Silverstones in, which looked good to me), air filter, smog filter and intake tubes this weekend. Now for the smog test
Old 03-31-2014 | 06:38 PM
  #92  
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Originally Posted by ptuomov
I agree with basics first.

However, how could any spark plug problem in one cylinder cause that kind of NOx readings with no HC and no CO?

The spark plugs are at most an indication of some other issue in this case, in my opinion. Perhaps that's what you meant.
Granted, not likely the specific problem.

What I meant was that I've spent literally days and days trying to get some of these cars to pass California smog. And like most automotive repairs, the problem is usually something simple.....but you might not find it until the second day is over.

Trust me, I've had one of everything you could ever imagine make these vehicles not pass a smog inspection, here.

When it comes to problems passing smog, you certainly do not want to miss any low hanging fruit and then move onto what are more obscure problems.

And a green spark plug and spark plug connector are about as low as the fruit hangs....
Old 03-31-2014 | 07:19 PM
  #93  
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I PASSED!!!
I did too today It must be a good day to have a 928 take the smog test. My 81 is running lean with Bosch Platinum +4's is it and a bad fuel pump. I thought it would fail due to high NOx.

This is great that you passed after so much trouble
Old 03-31-2014 | 07:31 PM
  #94  
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I missed the boat. It's also raining. No way in hell my new wax job is going to get bathed with rain and grime.
Old 04-01-2014 | 11:24 AM
  #95  
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The Forgotten On.. congrats as well on passing.,

Thanks again to all the help on this issue!!
Old 04-01-2014 | 12:07 PM
  #96  
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Originally Posted by Mongo
I missed the boat. It's also raining. No way in hell my new wax job is going to get bathed with rain and grime.
Test when the air is rich with moisture droplets and potentially get get lower combustion temps.



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