Date: Tue, 15 Aug 2006 17:39:37 +0000
Reply-To: dhaynes@OPTONLINE.NET
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject: Re: Desperately Need Smog Help...Read all past posts....
In-Reply-To: <20060815164546.73321.qmail@web33002.mail.mud.yahoo.com>
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Over advancing the ignition timing is the worst thing to do for excessive HC at idle. This causes insuffecient airflow so HC and CO will sky rocket. You need to find the real problem. If it is a low mileage rebuild, a compression and leak down test should be performed both to get a base line and valve problems are plentiful on new heads. After confirmation, of sound engine, next thing to check is the ignition system, particularly the wires. The resistor ends do go bad. The next step is injecter condition, matched output and good spray pattern. you don't say what the CO is. This will tell if the O2 sensor is trying to work. A new sensor does not mean the wiring and controller is right. Make sure the engine is not overfilled with oil. This can add to the HC readings although you are so far out there. If all is well, HC should be under 100 before the Cat with CO ~.5%. After a really good Cat, you should see near 0.
Dennis
----- Original Message -----
From: Anthony Rutland
Date: Tuesday, August 15, 2006 12:55 pm
Subject: Desperately Need Smog Help...Read all past posts....
To: vanagon@GERRY.VANAGON.COM
> Hello all,
>
> New to this list but been on the syncro vanagon list for a
> long time. A friend reccomended I pose my smog challenge to the
> gurus here.
>
> 87 VW vanagon syncro. Just installed an AVP rebuilt motor with
> 37K on it from a subie'd vanagon. Runs great and passes smog at
> anything other than an idle.
>
> Currently at idle it runs rough. Like it has a miss. I have
> done the brakleen vaccum test at every junction. Contact cleaned
> all electrical connections and grounds. Different AFM's, Idle
> control module, Idle control vavle hums just like it should.
> Even tried different computers. I have a Bosch D and a Triumph
> Allen. Runs better on the bosch which is stock for my van.
> Replaced two injectors as the tips looked scorched.
>
> First test was gross polluter on all counts. New cat and it
> was a GP at idle with 777 measured on HC. Passed everywhere else.
>
> Full tune up, plugs, wires, cap, rotor, O2 sensor, temp II
> sensor. Still failed at idle this morning excpet this time it
> was 800 HC at idle.
>
> Lastnight my neighbor Craig Forney came over and took a look
> at it. We bumped up the timing just barely as it was falling
> flat on its face at the stock setting. We also turned in the
> throttle body air bypass screw (affects idle) 4 full turns.
> Otherwise the idle was going too high with the timing just
> slightly advanced. Could this affect the smog readings adversely?
>
> So thats where I am at currently. Any thoughts, expertise and
> advice greatly appreciated. Shops are expensive to troubleshoot
> these problems here in the California bay area.
>
> Anthony
>
>
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