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I'm still in the break-in period for an 04 TBS. I've noticed that somewhere between 3200 and 3400 RPM, I get these weird harmonic like vibrations. Almost feels as though I've downshifted (slight increase in noise and I'd swear the tack should be leaping ahead, but no movement there at all).
I noticed it first on my way home from the dealership. The ride was about 90 miles and of course the max break-in rpm is 3500. I could tell every time I'd slow down to around 3200 as this downshift feeling would kick in.
Now that I can increase to 5000, I've notice that accelerating through this low 3000 spot isn't pure...don't know how to describe it other than that. At 3500 it smooths out and just hums.
Obviously I'll be back at the dealer at 500 miles, but just wanted to know if anyone had some input on this that might make my dealer conversation a little more worthwhile.
Clif
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