I was inspecting a used Toyota Auris (2009-2010). I turned the engine on and with the car idling I removed the oil cap from the engine. The car stalled within seconds and the engine almost shut down. I have read several websites. Half of the people argue that this is normal because the sensors cannot meter and adjust the air/fuel mix. Other people say that the engine and / or the PCV probably have problem. Has somebody replicated this? Do you have any views if it normal or an indication of a faulty engine? My Toyota Corolla (2004) does not stall and continues running but I expect the technology is completely different. Thank you!
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Removing the oil cap creates a large vacuum leak for the engine, and it may cause the engine to stall - whether this is normal or not depends on your specific engine and what its capabilities are in dealing with a large vacuum leak. Different engines handle this differently depending on what sensors they have and the programming of the ECU.
If the engine otherwise runs well and does not have any stalling or power issues, I wouldn't worry about it. If it doesn't run that well, it could have a variety of issues, from needing a basic tune-up to even more serious issues.
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