ISC, Boost leak, Plugs?

[Sparky2211]

So i have been searching for days now to try to fix a problem on a car that i just got. Heres the issue.

I can drive the car while it is cold and it is fine with no stalling and really it runs great! but after it warms up, when i come to a stop (Push the clutch in) the cars RPM will drop off to 100-300 RPM or it will just die.

There is nothing done to the car at all. It is completely stock with NO modifications at all. What do you think the problem could be. i have been looking on Vfaq for different ideas on what the problem could be. All i know right now is that it could be a vac leak, ISC, Boost leak, Bad BISS setting. What do you think?

BTW: the Car is a 90 Talon TSI AWD

[skyhigh350]

The 90' ?

Either TPS related or the sensor that the throttle hits on at idle is misadjusted..... Or it could be something else, just throwing in my 2 cents..

[Sparky2211]

^^^ Thank you, All 2 cents will help. So i was looking at that sensor that the throttle hits and it seems fine. I didn't know that i could adjust it though?

What i do to lower the risk of the car stalling is to just downshift to a stop and then leave it in gear until i get to about 1k RPM then i push the clutch in. Then it doesn't stall (Almost everytime.)

If that helps at all

[skyhigh350]

Well that sensor will adjust up and down with a 14 mm wrench. I adjusted mine and it fixed my idle. It was unsteady and it made it steady. The tps will adjust air fuel mixture, but I am not 100 percent sure if it will effect what is happening to you.. You say if it is in gear than it idles at a normal state? Will it die down as soon as you pull it out of gear with the clutch in?


edit**
Also have you attempted adjusting the idle air screw? And have you timed your engine correctly?

[Sparky2211]

If i leave it in gear to come to a stop i can ride it down to about 1000RPM and then i can push the clutch in and it will drop down a little bit, but it won't die... Almost like it has more time to adjust the a/f or something.

[skyhigh350]

Hmm not sure if this will effect it but check the sensor on the trans, it is right on top of the trans and under the BOV... It may be unplugged or it may have corrosion.. As far as a/f i'm not sure if having it in gear would change anything.. however I am new to this..

[Sparky2211]

x2 i just got the car about a month ago and i just started driving it this week. I don't know know a ton about DSM's. i am just lost on why it is doing it. I first thought it was a vac leak, But wouldn't it do it when i first start the car as well.

[Goat Blower]

Have a friend look down the driver's side of the engine at the crank pulley while you push in the clutch. If it moves in and out, you have crankwalk. Just pushing in the clutch doesn't put enough load on the engine to make it die otherwise. And the sensor on top of the tranny is the reverse light, it doesn't have anything to do with your problem. Report back to us once you've checked this.

[Sparky2211]

Will do... Thanks. Lets hope it isn't though

[Sparky2211]

So crankwalk is out of the question... Looks fine.