Hello, I am wondering if anyone has a little howto on testing the ISV on an 87 4kq. I looked at, cleaned it, and I still think it is a little funky. I was wondering what and how much voltage to apply were to verify that it is working correctly. Any ideas? Thanks, Cade Carvell National Business Systems, Inc. 2919 West Service Road Eagan, MN 55121 Office: 651-994-4400