Thread: EPA caught VW cheating - how does the car know it's being tested?
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Jon Elson[_3_] Jon Elson[_3_] is offline
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Default EPA caught VW cheating - how does the car know it's being tested?
wrote:


Ignition ping is caused by too fast combustion.

Modern cars have a knock sensor and continually advance the base ignition
timing incrementally until the knock sensor "reports". Then it backs off.
This allows it to give you better performance with better gas. I know this
is a diesel, but when it comes to EGR it still does the same thing.
The VW cars in queston are DIESEL, not gas.

Jon
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