[T3] 73 auto trans type 3 ARR ?

[Jim Adney]

On 10 Jun 2023 at 13:50, William Jahn wrote:

>  I checked the AAR today and drove the car. The AAR was open cold 76
> Degrees here. After I blew in the hose to see if it was open, engine off.
> Then I drove it today the RPM never increased and actually dropped down to
> 800 RPM in drive. Once I got home I checked it and it was closed. I didn't
> feel any suction at all however the idle was back up to 1400 RPM.

It sounds like you're getting the right results, but I recommend that you not 
test by blowing in the hose or feeling for suction. Both can be misleading.

Just test with the engine running, to see if the idle speed changes as you 
block and unblock the AAR inlet hose.

> I now know it's not the AAR , All I can think of is some new vacuum leak and
> I didn't see any hoses off and just changed them all last year along with
> everything else intake gaskets, Rummer boots , injector seals, fuel lines,
> every single hose.

I now understand your problem. It wasn't clear before. Yes, it sounds like 
you have some sort of intermittent air leak.

Did you use the correct FI manifold gaskets, the paper/phenolic ones, not 
the metal Beetle ones?

Are each of the small injector seals properly seated in the recesses in the air 
runners? Are the 4 bolts that hold the rear cover on the IAD tight?

When installing the intake runners, you may also need to let the IAD settle 
into its best position, along with the runners, followed by possible bending of 
some of the runners to get good alignment, so the runner boots don't get 
distorted and leak.  

Another possible source for a SMALL intake leak is the large O-ring in the 
MAP sensor. This would make the FI run rich, but might not make a 
perceptable difference in the idle speed.

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