Injector buzz issues at key-on.
Hey all. My truck is at 96k miles on the original injectors and ficm, as well as original strategies as far as I know.
As long as my truck had good batteries (as it does now) the injector buzz was nice and constant and sounded perfect when the key was turned on. Recently the buzz has started to sound slightly funny. A few day's ago, the buzz was essentially non-existant. The truck has been running and starting perfectly. On the trip after I really didn't hear any buzzing, I got back in the truck after stopping for lunch and the buzz sound as good as alway's.
I'm wandering if my FICM is starting to get weak. I'd like to catch it before it causes damage to the injectors if it is starting to go bad. I havn't done a voltage test yet and am solely going on sound at this point as I have been away at work for the past 8 out of 9 day's. I was just thinking about throwing this out there to see if this is a typical pattern that a failing FICM show's.