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2009 Mercedes-Benz E-Class Sport 3.5L 4MATIC AWD 4dr Sedan

2009 Mercedes-Benz E-Class
Trim Info:
All Wheel Drive, 4 Door Sedan, Mid-Size
16 mpg city / 22 mpg hwy
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Why is this happening?
This pinging sound indicates "pre-ignition". Pre-ignition means the air/fuel mixture in the engine's combustion chambers is igniting sooner than it should

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When does the engine ping?

While driving at high altitude
When driving uphill and the engine temperature begins to climb
Seemingly at random

You chose: Pinging
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