[T3] Old Type IIIs (Exhaust Tester

[Dave Hall]

I didn't think the potentiometer was fitted to Type 3 ECUs, but I've not
seen too many FI Type 3s here anyway.  I've a Type 4 ECU with a
potentiometer - it clicks as you turn it.

BTW, you do indeed adjust the tester to read 2% CO, but our atmosphere
doesn't contain that much.   I think there's a heated wire that changes
resistance as the exhaust gases pass over it, but I don't know why normal
air affects it the same as exhaust with 2% CO.

Dave.
UK VW Type 3&4 Club
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-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org
[mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of Phil Hof
Sent: 05 March 2011 16:30
To: type3-vwtype3.org at lists.vwtype3.org
Subject: Re: [T3] Old Type IIIs (Exhaust Tester

I never saw it in VW publications, but there I read an instruction to adjust
the little potentiometer on the ECU of '72/'73 models to adjust the CO
level.  I don't have the manual (was it Clymer?) that gave a spec, but
memory suggests somewhere between 1-3%.

Our atmosphere contains about 2% CO and the testers are calibrated to this
value prior to test, by the way.

-Phil
-------------------------------------------------------------
> Date: Fri, 04 Mar 2011 22:12:47 -0600
> From: "Jim Adney" <jadney at vwtype3.org> If you find a shop that has an 
> exhaust analyzer, they will probably be most likely to measure CO 
> levels. They may know what to expect, but they're most likely to be 
> familiar with newer cars which will have lower CO than ours. I'm not 
> sure what ours should be. I'd guess 1-3%, but I could be wrong. I'm 
> not aware of any specs that VW published on this for Type 3s.
>
> Were there specs on this, Russ?
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