Discussion Starter · #1 ·
There is a Ford Quality Care Center just up the street from my work. After work yesterday I drove over and took the service rep for a ride while 2920 was still cold. Right on cue at 3000 RPM the death rattle did its thing. He looked a little surprised and said he wasn’t too sure what it was. I made an appointment for this morning for 2920’s 12,000 mile servicing and he said they would let it sit all day and listen to it again when I got off work. Before I got there the rep (who used to be the rattle and vibration specialist at the main dealership) and the lead mechanic (this guy also teaches Auto Mechanics at the local college) took the car for a ride and listened to it. (3 miles – I checked!) When I got there 2920 was up on the lift and they were looking at it. They said the same thing Driving Simulator mentioned once in an earlier thread - harmonic resonation. They also noticed the “under-load” difference. They explained that when under load the engine twists against the mounts and may be causing something to touch something else. They both seemed very interested in figuring out what it was that they heard. I asked about detonation, pre-ignition and piston slap and they both said no, they think it is something else. The rep said that first thing tomorrow he was going to check the Ford service web site for any info on the problem he could find. That’s when I told them about Bullitt Club and that a good percentage of Bullitt owners are having the same problem. After he checks with Ford they want me to leave the car again so they can attach a ‘chassis vibration analyzer’ and pin point exactly where the sound is coming from. He says they attach an array of microphones to various locations on the chassis and attach them to a ride along computer. It compares the volume of the noise and shows its exact location. Pretty cool. Again, something like what D.S. was doing. Long story, but we'll see what happens!