idles erratically then stall

hello again i have a problem with my passat 1.8 t i had it chip couple of months ago then suddenly i expereince the erratic idle then the engine stall & it takes time to restart the engine agin its annoiying especially when the car stall on the traffic lights. so what i did i put the older chip back then the car starts. i dont know if the tuned chip is the problem or other components coz i used the tuned chip couple of months & it was ok but lately its just happen the idles playing up & down then stall.pls if anyone could give me a solution for this i really appreciate so much as of now i'll observe the old factory chip for the meantime.thanks

It is the throtle body that is the problem.Take it off cleane it and do the basic seting with the vag com and it willbe OK. The most problems that Ive seen on this forum are similar to yours and it suprisses me that most of people dont konow about it when this is common problem.

If this only happens when the engine is warmer... then it could be the same problem I had, which was coolant temprature sensor. Worth getting it scanned or scanning yourself with VAG-COM.

thanks for your reply mate but this happen suprisingly not always like this before but only now really terrible expereince i change the coolant temperature sensor new one day after its really playing the idle then stall & i cant start the car anymore but when i put the factory chip back thats the time the car starts without hesitation the idle is find.is there a possibility that the car ecu or other components can damage the tuned chip?coz i think its like the engine misfires i dont know. im confused coz if i use the old factory chip the car start when i use the tuned chip it wont start. anyway im going to cleaned the throttle body again coz thats what the tuned chip company said i hope.

Had a similar issue with my BMW, stalling randomly - it was a cam position sensor.

Of course I don't know if the 1.8T has one so I could be barking up the wrong tree...

-Steve

Yes What Im Confusing About That When I Put The Factory Chip Back The Car Start Without Hesitations When I Put The Tuned Chip It Wont Start. Im Using The Tuned Chip For 2 Months And Its Find Only Now The Idle Is Playing Then Stall But Not Everyday When I Used It. The Problem Just Puff Out Suprisingly.

Have you got equipment to read fault codes? You could try cleaning and resetting the throttle body.

yes i have but i cant do it today coz its raining maybe tomorrow then i'll see if it works.

Quote:

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Originally Posted by ANGELO33

Yes What Im Confusing About That When I Put The Factory Chip Back The Car Start Without Hesitations When I Put The Tuned Chip It Wont Start. Im Using The Tuned Chip For 2 Months And Its Find Only Now The Idle Is Playing Then Stall But Not Everyday When I Used It. The Problem Just Puff Out Suprisingly.

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Sounds like you need a refund from the chip tuner, or at least more help from them for free. I don't think VW will want to help much !!!

YAH THEY SAID ITS THE THROTTLE FLAP ANYWAY I GOT IT DIAGNOSE TODAY AND THIS WHAT I GOT

16885 (P0501) Vehicle Speed Sensor Range/Performance
INTERMITTENT
670-- ------- Throttle Position Sensor -G127
Incorrect Signal INTERMITTENT

17967 (P1559) Idle speed controller
INTERMITTENT
SO IS THIS ONE OF THE POSSIBILITY THAT THE IDLES PLAYING & STALL?I CLEARED IT BY THE WAY & IM GOING TO CHECK AGAIN IF STILL APPEAR.