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Sxt 2019 start up

637 Views 6 Replies 3 Participants Last post by  Neeks760
When I start up the car I hear a weird clunk sound. It only does it about 50% of the time but I find that mostly when the engine is hot. Anyone else have this issue?
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· Registered
2015 RT 5.7 M6
13,023 Posts
You sure it's not pre-detonation? Hot engine and low octane can cause the this. BTW there was a TSB late last year where the PCM calibration was updated to avoid knock during acceleration on the SXT. I would check to see if this update has been done on your challenger if not would be good to get the latest calibration.

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