Stalls at idle?

[Jehos]

I just got a 2005 S3 with about 10.5k miles. Basically stock (the only upgrade I found was different mirrors and a different front brake line).

I learned very quickly not to try to rev the engine when starting it, because the ECU freaks out. However, I'm still running into an issue where sometimes if I pull the clutch approaching a stop and drop from 3k-4k rpm down to idle, the bike just stalls. When I start it back up, it idles really low like 800rpm for about 5-10 seconds, then slowly the idle speed picks back up to normal. If I try to ride off while the idle is low like that, it will die again as soon as I pull in the clutch.

Any suggestions? Is my fuel map messed up, or maybe the throttle position?

[Antihero]

have the exactly the same problem...
...throttle body synchronization was the cure.

[Jehos]

Ah, thanks. Is that a do-it-yourself kind of thing?

[andytrance]

Had a similar problem on an older s3. I Blew on all the breather lines from the tank and it fixed the issue

[Joe Houle]

Start bike, do not touch throttle.

Open beer.

Let bike idle until the fan kicks in

Open another beer.

Wait until fan is on for a minimum of 12min..



This will reset the adaptives. See if that helps. I do suggest checking the airbox for any obstructions, mice nest, etc. As stated, checking the throttle body balance is also a good idea. You will need TuneECU and an OBD-2 cable for that.

edit: forgot to mention, if you give the throttle ANY input, ANY time you are trying to start the bike, it will make her bitchy..

[Peter Howes]

Had this on a sprint rs - there is a sensor on the crank that tells the cpu if the engine is turning over or not - mine was dicky kept stalling or stopping at junctions - easy fix - well that was my prob anyway

[killcity]

Hey Jehos, I'm having the same problem on my bike. The shop I brought it to replaced the TPS and stepper motor, but its still doing it ($700 later). Did you happen to figure it out?

Originally Posted by Jehos

I just got a 2005 S3 with about 10.5k miles. Basically stock (the only upgrade I found was different mirrors and a different front brake line).

I learned very quickly not to try to rev the engine when starting it, because the ECU freaks out. However, I'm still running into an issue where sometimes if I pull the clutch approaching a stop and drop from 3k-4k rpm down to idle, the bike just stalls. When I start it back up, it idles really low like 800rpm for about 5-10 seconds, then slowly the idle speed picks back up to normal. If I try to ride off while the idle is low like that, it will die again as soon as I pull in the clutch.

Any suggestions? Is my fuel map messed up, or maybe the throttle position?

[triplerock]

+1 on Joe's comment- Check air filter, could be something simple. Sounds like classic engine starving for air, aside from all the other technical stuff that could be causing it.

[killcity]

it's weird, because it only happens to me when i have the bike in gear, rolling , then i pull in the clutch and let off the throttle. if i leave the bike in neutral, with the clutch left out and rev it, it comes back down to correct idle.

Originally Posted by triplerock

+1 on Joe's comment- Check air filter, could be something simple. Sounds like classic engine starving for air, aside from all the other technical stuff that could be causing it.

[Equito]

You can read about my experience here: http://www.thespeedtriple.com/forum/...most-stop.html

Not to say my cause is your cause, but it's another data point for you.