That was happen to my deaf customer who brought her a Toyota Camry for oil
change. My tech informed me that he heard noises in timing belt then informed her. I can't hear it but I use a long driverscrew to pinpoint the engine, feel the handle of driverscrew to see if feel funny as driverscrew to be move to another place to compare the feelings. If strange, I call my tech to hear it for me. One problem is I can't detect the low noises with my driverscrew. I have fuel injector test gun with LED blinks to probe injector to see the blinks and can be use it for noise areas.
