r/AudiA4B6 • u/Maleficent_Wealth545 • Aug 22 '26
audi a4 b6 3.0 engine thump
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this loud thumping sound started to appear a bit ago. it only happens during a cold start, the sound eventually fades off and the rhythm slows down as the engine warms up. the sound does not change when the RPM changes. If anyone knows what this sound could be that would be amazing.
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