Discussion Starter · #1 ·
I have a service appointment and have always found that I get better results when suggesting what I think the problem is, so here's what's up. At interstate speeds of between 74-78 MPH, I get a howl from over my right shoulder in M8 and D8. If I slightly accelerate, the howl diminishes above 78 and goes away as I top 80, and obviously, it goes away if I lift and drop below 74. My initial reaction was the right rear tire, and then the non-functional ZF1 right side vent, but what has changed my mind is that I can also make the howling stop by downshifting to M7, and make it come back just as quickly by upshifting back to M8 while maintaining the same speed in both gears. This scenario makes me think it may be in the drivetrain. What has me worried is that the Service Mgr. says she has never heard of this even though they sell about 500 Corvettes a year. I also mentioned lag between 1st & 2nd gears, which I was also told that they haven't heard of that, which can be expected with a new model year tranny. Fortunately, BOBSZ06 posted a Service Bulletin and I followed the instructions for "Active Learning" for the A8 and it cured the lag. The last thing I want to hear from the the Service Dept. is we couldn't find anything wrong. The howl has been going on since delivery to currently 400 miles, so anything you guys think I should suggest to the Service Dept. would be greatly appreciated.