TransmissionDiagnostic helpCommunity Starter

2018 Infiniti Q50 — light-throttle shudder around 35–45 mph

CommuterDriver262Community StarterMay 28, 20262018 Infiniti Q50 Red SportPhoenix

2018 Infiniti Q50 Red Sport, about 138,000 miles. There is a rumble-strip-like shudder at steady light throttle in a narrow speed range.

1 replies

ColdStartEnthusiast797Community StarterCommunity StarterMay 29, 2026permalink

I'd want a measurement, not a hunch. Two 2018 Infiniti Q50s can feel identical and have different causes, so measure before you copy someone else's repair. That's the branch I'd chase this week. I'd want that in writing, not as a promise. Trying not to diagnose from the couch.

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