smog test

[Jim Dupree]

Eric,
I did not see any replies to this yet, I hope I can help.
Have you gone thru the whole fuel mixture/idle speed adjusting procedure?
If so, it sound to me like your oxygen sensor is old and slow to react. The
system is designed to go from a little rich to a little lean and back and
forth. When the oxygen sensors get old the react too slow and the system
starts going a lot rich and then a lot lean and so on. Unless you know the
sensor is new I would suggest replacing it. 86 should use a heated sensor
(3-wire) and you can get generic 3-wire sensors and splice it on to the OE
harness. 4kq's are a PITA to replace but will pay off on gas savings and
performance.
Good Luck
Jim


----- Original Message ----- 
From: "Eric Henning" <spiders_2000 at yahoo.com>
To: <quattro at audifans.com>
Sent: Friday, March 31, 2006 5:55 AM
Subject: Re: smog test


>
> My 86 4kq w/ 155,000 miles had a heck of time getting
> thru PA emissions test with high CO problems.  I have
> a CO analyzer and as the var idled you could see the
> readings drift way up, then way down.  Supposedly
> these Audi's are known for this.
>
> I had an aircooled VW van and used to put some
> denatured alcohol in the gas and used to pass all the
> time.
>
> Eric
>
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