Bzoo
I tried the rpm test yesterday evening and at the 2000 rpm there was some roughness, then I did the highway test as you suggested, the vibration did not change. I thought the vibration might change, when I shifted into neutral since there was some vibration at 2000 rpm test, but it had no effect on the vibration. Do you have an opinion of what direction this test would lead me, maybe it’s just suspension related? What Michelin tires did you buy for your 400E, and did you get the air/vent problem solved? The only tire blow-out I ever had was when my wife and I was returning from a Nascar race outside of Atlanta, she was driving our 89 300E, about 85, and a rear Mich x blew its side wall out. Other than the noise, the car tracked straight ahead!
Thanks, timreid