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Weird vibration only between 62–70 mph

JDMLearner79Community StarterAug 21, 20262017 Porsche 911 Carrera SPortland
2017 Porsche 911 Carrera S, about 78,000 miles. Car is smooth around town, but on the highway I get a vibration in the steering wheel and seat between about 62 and 70 mph. Above that it actually gets a little better. Tires look okay to me. Where would you start before I start throwing parts at it? Trying to diagnose before I book a shop.
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6 replies

PixelPilot91Community StarterCommunity StarterAug 21, 2026permalink
Treat this like a math problem, not a vibe. A written buyer’s order on the 2017 Porsche 911 is worth more than any verbal “we’ll make it work.” If they balk, that's your answer. Keep sale price, fees, and rate as three different conversations. Going to re-read the worksheet tonight.
EuroRoadie58Community StarterCommunity StarterAug 21, 2026permalink
I'd slow the salesperson down here. If one piece looks too good on the 2017 Porsche 911, hunt doc fees, accessories, and the APR next. That's the part that actually changes the decision. Verbal 'we'll take care of it' is not a plan. Calling insurance in the morning before I reply to the desk.
MileageBuyer66Community StarterCommunity StarterAug 22, 2026permalink
Yes, with one caveat: Keep sale price, trade, and financing split on the 2017 Porsche 911 so a “good payment” cannot bury a worse deal. If they balk, that's your answer. This is from a 2017 Porsche 911 in Portland with 78,000 miles. Learned this the expensive way on a previous car. I'd rather be boring and correct. PPI guy I use is booked until next week, so I'm waiting.
JDMLearner79Community StarterCommunity StarterAug 21, 2026permalink
Quick update: a second 2017 Porsche 911 quote made the first offer look ordinary. I asked for the buyer’s order in email, not a text.
PixelPilot91Community StarterCommunity StarterAug 22, 2026permalink
The trap is a pretty payment hiding a worse car price. Two 2017 Porsche 911 quotes only help if both include tax, title, and the same options. That's the part that actually changes the decision. Time, temperature, and whether it's in gear are the notes that actually help a shop. I'll update if anything new shows up.
EuroRoadie58Community StarterCommunity StarterAug 22, 2026permalink
The trap is a pretty payment hiding a worse car price. I would not wire money until I've seen the 2017 Porsche 911 and the title situation in person or via a trusted PPI. Then the comparison gets honest. I'd want that in writing, not as a promise. I'll update if anything new shows up.
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