I have a 2001 1.6 16v Seat Toledo.
My car randomly stalled when the engine warmed up to operating temperature and I could not restart until it cooled down. A mechanic cleaned the throttle valve. After a month when the coolant liquid warmed up to 90C the engine stalled when idle. I can avoid stalling by keeping my foot on throttle and if the engine stalls I can restart it. Seems that the throttle valve cleaning had some effect but it did not solve the problem. The diagnostic tool does not show any error codes. What could be the problem? It can be the EGR valve?
Update(the whole story):
Let’s start at the beginning of the story. About 3 years ago while I was driving the car (it was in gear) the engine died, it had no power. It was like I would release the gas to use the engine break. I shifted down 2 gears to rev up the engine, after 3-4 seconds the power came back. When this happened the check engine light came up. The error code was caused by an EGR valve failure. So after the engine power came back everything was fine. But the phenomenon started to appear again and again more frequently and once the power did not came back and I was unable to restart the engine. I had electric power. When the engine totally cooled down it started as nothing would happen. I took it to a mechanic, he said that the stalling was caused by a stucked throttle valve.
The phenomenon with the stalling engine disappeared for 3 years, when the last month the engine stalled right after it warmed up. The engine did not start until it totally cooled down. After the restart the idling was not stable for the first 20-30 seconds. After that it became smooth. This time were no error codes. I took it to a mechanic again (to an another one), they cleaned the throttle valve. The car runned fine for one month. Exactly when the engine reached the operating temperature, it stalled in neutral with the throttle released. This time I could restart the engine and I could avoid stalling by pressing the throttle. No error codes. After the engine cooled down at the first start with cool engine the idle was not stable for few seconds. After 10 seconds it became stable. • There are no strange noises coming from the engine before or after it stalls. • There is nothing unusual vibration before the engine stalls. • I did not felt any burning smell. • The connection of the battery terminals are good, they was cleared of corrosion. • The car has a manual transmission.