krystar

http://www.youtube.com/watch?v=ZOFC42u3O7k

83 944NA with no ISV, no AAV. only vacuum lines going from intake mani to brake booster, throttle body to FPD/FPR, and AOS to Jboot.

various ppl have asked about it...so thought i'd post up.

Cass944

been running mine like this since i got it back together

from what i was told. the only time the isv is only used to compensate for the extra load on the engine when you turn on the AC

I just adjusted the screw on the throttle to make it so its almost like im always touching the pedal that tiny bit. I really cant tell any difference between with and without the valve anymore

Yarf

I am curious why did you do this?

catamax944

I have my idle screw not touching the cam at all so that should mean the throttle is completely closed and the ISV does all the work always. If i set the idle with the screw it will stumble and idle will rise when the engine gets hot, with the ISV doing all the work it runs perfect (even on cold mornings starts first time and idles perfect). Why is that? maybe the throttle body needs a reseal ?

Yarf

You have something that needs attention.
Try this procedure.
http://www.clarks-garage.com/pdf-manual/fuel-08.pdf

mhr

I unplugged the ICV from my S2 2 weeks ago and it idles allot better then with it connected so I am figuring my ICV has an issue. Only problem is when A/C is on the idle drops for a split second when I let off the throttle never stalls but drops to 200 or 300. Annoying so I will replace the ICV but other than that I wouldn't.

Yarf

I took my ICV off and cleaned it with brake cleaner and compressed air. My 87 944 NA has a 3 pin connector on the ICV, with the center pin connected to 12 vdc and alternately apply ground to the other 2 pins the ICV spool will shuttle back and forth allowing auxiliary air to mix at the intake or not. This is the method that allows the DME to manage the idle speed. Catamax944 that is not the idle screw at the throttle cam, the idle adjustment procedure is @ http://www.clarks-garage.com/pdf-manual/fuel-08.pdf

roman944

... now ... ISV = AAV on early cars, correct ?

Wipeout

Correct.

V2Rocket

how does it idle while cold?

John_AZ

krystar,
Interesting video.

Yarf,
This is my next project. The problem is that with the intake maniflod on it makes it nearly impossible to get out. I have taken the vacuum hose off one side and sprayed Gumout Air Intake and Throttle body cleaner directly into the ICV with a longer thin hose. This helps somewhat,

I did find another thread on rebuilding the ICV on Pellican if anyone ever wanted rebuild the ICV.

http://forums.pelicanparts.com/porsc...dle-valve.html

GL
John

choinga

jeez...i had the same problem and bought new one...case closed. Idles great cold or warm.

xsboost90

its all about deleting systems that are deemed not necessary. Maybe adjusting the idle screw on the throttle body would let more air in at idle and you wont need to touch the throttle or the cable.

i mean the screw on top of the TB that lets air bypass the butterfly.

catamax944

Ok,thanks,my mistake about the idle screw although the other one works as well as an idle screw by pushing on the throttle and letting more or less air through.Anyway what is the actual function of that screw? Yes mine also has the 3 pin ICV,it's a '86,all late cars have the 3 pin, i took off the ICV a couple of years ago and cleaned it with gasoline,it works great ever since and compensates for the idle screw not beeing set right.I may never set it,i think if you keep the ICV always working it wont get stuck as is usually does when working normaly (intermittently).

Yarf

Check the throttle stop set screw to make sure that the throttle plate is vertical when closed and try to minimize the gaps between the throttle body and throttle plate. The TPS switch should click just when the throttle is slightly advanced. If the throttle plate and or TPS switch are not set correctly then the DME will not maintain proper idle. When you have completed these checks then use this procedure to set idle speed. http://www.clarks-garage.com/pdf-manual/fuel-08.pdf