1991 Buick Park Avenue

I just went throught the same thing. I found out it was the cars VATs security system. I had to bypass it. Sometimes the key which has a resistor chip in it will get worn. I replaced my whole starting system before I found out about this. I found an easy and cheap way to fix it. Go to www. Likeabigdog. Com click on the link about Security systems. It will tell you everything you need to know. All 1991-1996 buick park aves have either a PASSkey II system or the VATs. Good luck. It works great and can save alot of frustration and money