If you're hearing a single rather loud clunk each time you turn the ignition switch to "crank", first check the large copper nuts on the starter relay to be sure they're tight. It's on the inner fender near the battery, in fact, you can follow the positive battery cable to it. It's common for those nuts to work loose.
Feel that relay to see if it is clicking when a helper turns the ignition switch.
Tuesday, April 26th, 2011 AT 10:35 PM