[T3] Engine Idle very low, once warmed up

[William J]

 The part you are describing is the part Jim talked about . It allows 
additional air past the throttle since the throttle is closed at idle so it 
increases the idle speed when cold .

 Since you have an engine off an auto trans model this is why you have the 
electrically heated AAR on a manual trans the one you have in your parts bin 
that's heated by engine oil instead of electric in the proper one yet they 
can still stick.

 Point is as Jim said to make certain it's not the AAR axillary air 
regulator you need to plug the end on the hose connected to the oil bath air 
filter then adjust the idle speed . If you feel suction on that hose when 
cold it's open as it should be and no suction when closed = normal idle 
speed adjustment using the screw with the lock nut on top of the IAD intake 
air distributor. you do have a lock nut if not the screw will back out or 
in.

 Since the engine runs well when the idle is up see if the throttle cable is 
not sticking or remove the oil bath and see if the throttle plate is fully 
closed when hot and not gunked up and sticking /binding because temps can 
affect this . If it's not fully closed when hot it's just like stepping on 
the gas pedal more air = higher idle .

 I bring this up because the IAD is aluminum and the throttle disc is steel 
and aluminum expands more when hot if so suddenly when hot the throttle can 
fully close = lower idle when hot. Other things can affect the idle yet it's 
best to start simple.
----- Original Message ----- 
From: "Jared Kohler" <jaredkohler at gmail.com>
To: <type3 at vwtype3.org>
Sent: Wednesday, August 02, 2017 6:35 PM
Subject: Re: [T3] Engine Idle very low, once warmed up


> Hello Jim,
>
> Well, did my idle adjustment (when nice and warm) after a long drive and 
> she still acts the same. I made the adjustment when she was idling in the 
> garage and did notice the rpm increase. I shut the car off, then started 
> again. Same super low idle. Gen light flickering it's so low. Yet, when 
> cold (first thing in the AM) idle is nice and high. Stays running strong.
> I'm wondering if it's not the vacuum operated sensor to the right of dist? 
> Mine is electrically operated. Perhaps it's not closing as it should? Or 
> opening as it should? I can't seem to get much info on these sensors. 
> Books seem to glaze over their function and importance. I do have a 
> mechanical one in my parts bin. Considering swapping to see if it makes a 
> change for the better!
>
> Thanks!
>
> P.S. A few years back, I think I had you rebuild my FI fuel pump? It's 
> still working perfectly!!
>
> Jared
>
> Sent from my iPhone
>
>> On Aug 2, 2017, at 08:56, Jim Adney <jadney at vwtype3.org> wrote:
>>
>>> On 2 Aug 2017 at 8:23, Jared Kohler wrote:
>>>
>>> Appreciate the reply and info! You're talking about the idle adjustment
>>> screw on the plenum, correct?
>>
>> Correct   ;-)
>>
>> -- 
>> *******************************
>> Jim Adney, jadney at vwtype3.org
>> Madison, Wisconsin, USA
>> *******************************
>>
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