Re: CO way to high

[Martin Peitz <peitz@HiWAAY.net>]

Melissa & Jim wrote:
> 
> On  1 Sep 97, Martin Peitz wrote:
> 
> > My 69 FI Sqrbk has an astonishing 9% CO at idle I just noticed.
> > Amazingly it runs fine, gets 25 mpg at 75mph. I checked everything
> > except the pressure sensor, which I know is slightly out of
> > tolerance
> 
> How do you know your PS is out of tolerance?  I've never known anyone
> that had the equipment to check it.  If you know how to do this, I am
> VERY interested!
> 
> . Can the pressure sensor get my CO so far out of wack? I
> > got some spare sensors but they're all 051C while I need 051B. Next
> > weekend I will go to my favorite VW junkyard with about 30 - 50 type
> > III's to get the correct one.
> 
> Yes, you need the B version.
> 
>  Did they ever make a ECU with a CO
> > adjusting screw like on the late type IV's?
> 
> Not for type IIIs.
> 
> If your hydrocarbons are also up, you might want to make sure all
> your cylinders are actually firing regularly at idle.  An innition
> tuneup might be in order.   Have you done a compression check?
> 
> Jim
>   ---------------------------------------------------------------------
>        Melissa Kepner                                    Jim Adney
>                              Laura Kepner-Adney
>                          jadney@vwtype3.org
>                              Madison, Wisconsin
>    ---------------------------------------------------------------------
I tested the pressure sensor with the EFAW 228, which checks primary and
secondary coil resistance. You can also do it with a VOM.
So I didn't actually check performance under pressure (vacuum), though
this should be possible with a good vacuum pump and meter. 
Injectors are new, ignition is new, engine is new, fuel pressure
adjusted.
Martin Peitz