I have a similar problem. She pants, whines etc. whenever I start the engine. I have tried DAB, a spray which is supposed to calm them down, you could try that. It didn't work for me, but I know it worked for a friend. I have tried putting her in a cage & even covering said cage (it works for parrots) but to no avail. I have now resolved to put her in the car as often as possible & not go anywhere. I think the problem comes from the fact that whenever she got in the car we were going to the beach or a country walk, in other words losts of pleasure for the dog.
Divegirl: tell me more about the stuff you put on the dog's tongue please.