Stalling on Deceleration with AC on Only
07-06-2012, 08:38 AM
#1
Rennlist Member
Thread Starter
Stalling on Deceleration with AC on Only
When driving the TT with the AC on, the car will stall every once and a while when I apply the brakes and clutch to come to a stop. It happens once out of 100 times, but only when it is the exact scenario above.
It isn't the most dangerous condition as I am stopping anyway, but I still would like to diagnose it fully.
Thanks as always to those of you with knowledge that dwarfs mine.
It isn't the most dangerous condition as I am stopping anyway, but I still would like to diagnose it fully.
Thanks as always to those of you with knowledge that dwarfs mine.
07-06-2012, 10:51 AM
#5
Race Director
The idle is electronically controlled by the ECU. While there is an idle set screw, I wouldn't mess with that.
THE ICV is the Idle Control valve. It opens when you shut the throttle to let enough air pass to keep the engine running.
Its the silver horizontal canister above the Throttle body.
To remove:
1. Remove the hose clamp going into the canister. I believe its an oettinger clamp, so you need to pry it open. I replaced with good old made in china worm clamp.
2. There is an allen bolt that holds a u shaped hold down. Remove bolt and hold down.
3. undo electrical connector and wiggle the thing up and out. NO IC removal is necessary, but obviously the shroud needs to come out.
4. Swish carb/brake cleaner in there and spin the little valve inside. Clean it up the best you can.
reinstall the same way it came apart.
THE ICV is the Idle Control valve. It opens when you shut the throttle to let enough air pass to keep the engine running.
Its the silver horizontal canister above the Throttle body.
To remove:
1. Remove the hose clamp going into the canister. I believe its an oettinger clamp, so you need to pry it open. I replaced with good old made in china worm clamp.
2. There is an allen bolt that holds a u shaped hold down. Remove bolt and hold down.
3. undo electrical connector and wiggle the thing up and out. NO IC removal is necessary, but obviously the shroud needs to come out.
4. Swish carb/brake cleaner in there and spin the little valve inside. Clean it up the best you can.
reinstall the same way it came apart.
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07-07-2012, 05:02 PM
#8
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Here is a good thread about idle, from last Spring:
https://rennlist.com/forums/993-turb...-idle-rpm.html
https://rennlist.com/forums/993-turb...-idle-rpm.html
07-07-2012, 11:09 PM
#10
Rennlist Member
The A/C being on I believe requires a slight automatic increase in idle speed ,if thats not occuring either
the idle control valve or some relay that does so may be out of whack...Bert
the idle control valve or some relay that does so may be out of whack...Bert
07-08-2012, 12:21 AM
#11
Race Car
I have the same issue. Only when hot outside, A/c on, and very randomly (1 in 100 times). I have a LWFW. But that doesn't explain it because this issue started last summer and my LWFW has been on there for 3 years.
Keep me posted if you figure it out. I have cleaned my ISV twice with. O change.
Keep me posted if you figure it out. I have cleaned my ISV twice with. O change.
