I am having a couple issues with my 94 Corvette with Auto Transmission with 107k miles…any suggestions would be much appreciated. First, when I am coming to a stop, from like 2 mph to full stop, I am getting like a clunking that sounds and feels like it is coming from behind me and to the right (from rear middle of the car). It does Not do this if I shift into neutral b4 I get to low speeds. The second problem is, I got caught in a very heavy rain last weekend, and the digital speedometer area started blinking off and on about once or twice per second, and the “idiot light” panel lit up like a Christmas tree. The car started sputtering but never stalled out…it was almost if it was turning itself off and on repeatedly. I pulled over under a canopy, and waited out the brief but intense downpour, and its been fine ever since (about 100 miles), but it has only been driven in nice weather since. I checked the battery connections (and that’s about it) and they were tight and clean
Carefully check the rear half-shaft CV joints and the differential mounts, give that whole rear crossmember a close inspection…
Todays cars, electronic marvels that they are, have very little tolerance for getting wet…There are a dozen “Black Boxes” under your hood and behind your dash…Keeping everything dry is very difficult…If it does not have any electrical problems then it’s not a Corvette…
It might be best to search for a Corvette forum or find a Corvette club near you.
+1 to caddyman’s post.
Be sure to check the inner CV joints carefully. They perform a different function and are designed and made differently. They’re more inclined toward these types of thunks under the described conditions than the outer CV joints are.
As regards the wet weather sensitivity, when was the last tuneup? While today’s cars are not nearly as sensitive to overdue-tuneup-induced wet-weather symptoms thanks to electronic ignition systems and fuel injection, worn electrodes and wet weather can still cause poor ignition. And you may have developed a path for moisture to penetrate the coils, the igniter, and even the crank position sensor. Someone will need to look for evidence of such, and since OBDII wasn’t required until '96, they’ll probably pull out the scope.