Loose timing chain?
Loose alternator mount?
I had an odd buzz that came in at certain rpm's. I thought it was something wrong with the starter motor as the source seemed to be from that location. It turned out to be the bottom bolt for the intake plenum's brace was loose. That brace is right at the front of the starter so I wasn't too far off...
My eL-cheapo version of a mechanic's stethescope is a length of 1/2" heater hose (about 18"-24"). Hold one end to your ear and aim the other end at any suspect areas. Be careful not to get your fingers near any moving parts (or we'll have to nickname you 'Lefty'...)
Loose alternator mount?
I had an odd buzz that came in at certain rpm's. I thought it was something wrong with the starter motor as the source seemed to be from that location. It turned out to be the bottom bolt for the intake plenum's brace was loose. That brace is right at the front of the starter so I wasn't too far off...
My eL-cheapo version of a mechanic's stethescope is a length of 1/2" heater hose (about 18"-24"). Hold one end to your ear and aim the other end at any suspect areas. Be careful not to get your fingers near any moving parts (or we'll have to nickname you 'Lefty'...)