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Date:         Wed, 20 May 2009 22:14:32 -0300
Reply-To:     Dave Arthur <dave.arthur@NSCC.CA>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dave Arthur <dave.arthur@NSCC.CA>
Subject:      More Digifant Troubleshooting ...
In-Reply-To:  <COL107-W6310D8BB0B7AA6CE7C6251DF580@phx.gbl>
Content-type: text/plain; charset="US-ASCII"

Now this may cause some friction and resulting flames...

I have been tracking engine idle and running roughness with my '86 2.1 MV Westy. I've uncovered a bunch of problems, but hadn't hit any that gave me major success until now.

I was in my local junk yard looking for a rear wheel bearing casting (another story) and came upon the remains of an '88 US made Jetta. I picked up the AFM off the car as it looked the same as the Vanagon unit and if nothing else I could disassemble it / play with it.

Upon a consult with ETKA the VW base part number 906 301 is the same. The Bosch part numbers are; Vanagon 0 280 202 079, Jetta 0 280 202 106. Close but certainly not the same.

Since outwardly and electrically (using a high Z DVM) they appeared the same, I cleaned it up and plugged it in. My Westy is of undetermined mileage, the Jetta was ~30,000 Mi.

The van started and idled smoothly, the real difference was on the road, very smooth acceleration and much better performance. Another thing of note was that the engine seemed much quieter, can't explain it.

Now my next test will be to see the effect if any on mileage. I'm guessing that I am not the first person who has plugged one of these units in an MV engine. Also there may be something very bad that will result from doing this :-(

I believe that my better performance and behavior is because the Jetta AFM was newer and less warn than the original unit.

Does anyone know of any danger with using the Jetta AFM? Also does anyone have a clue why the engine is quieter?

Also I had made comment in a previous post that I felt the mixture was rich in closed loop, since this change I feel it is closer to correct, in fact I get a few splashy exhaust notes, so I'm happy on that point too.

D


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