[T3] Bad day at the (FI) office

Jim Adney jadney at VWType3.org
Sun Apr 10 19:51:28 PDT 2016

On 10 Apr 2016 at 20:58, Daniel Nohejl wrote:

> Well, we had a breakthrough or two this week. The first was in
> reference to the MPS. Early in the week, I thought I´d gather up all
> my spares and see how well they held vacuum using the unscientific
> suck test. It turned out that the ones with epoxy were much "tighter"
> than my spare without epoxy. However, the one without epoxy was
> comparable to the ones with epoxy as long as I held my finger over the
> adjusting screw end. I tested out the one i? the car (also without
> epoxy) and it, too, was loose unless I held my finger over the screw. 

Tiny little leaks can probably be ignored, but any significant leak 
creats a pressure drop between the pressure sensor and the IAD. That 
means the pressure sensor senses a higher pressure than what's in the 
manifold, so it's going to ask for more gas, making things richer.

If you had some heavy grease, that might have enough staying power to 
seal the adjusting screw. Otherwise, I'll try to find you a plastic 
cap that will slide on there and seal it.

Otherwise, it sounds like you may be okay. 24 mi/gal is decent for 70 
mi/hr. You'll get better if you go slower, as long as it's steady and 
in 4th gear; you'll get worse if you go faster. Speed makes a big 

Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA

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