Hello all,
The last couple months. I've noticed that when starting the motor cold, there is a very brief rattle right as the motor starts to turn over, and is gone as soon as the engine comes to life (gone before rpm's come up). Almost like a really fast snare drum triple. I tried recording it with the hood popped, but couldn't hear it - it's most noticable from the cabin (but sounds like it's coming from the engine bay). It correlates to when the engine shakes on startup before getting up to idle speed. It doesn't do it when the motor is warm, it has to be cold.
I've asked the shop about it, but of course they can't hear what I'm hearing. I asked them if it could be shot motor mounts and they weren't open to this idea.
I know valvetronic motors can click, but everything thing I've read about bad valvetronic is it clicks when un-locking the door before starting the car - I've never heard that from my car.
Any ideas what this it? Shot motor mounts allowing parts to contact briefly that shouldn't normality contact?
I can't seem to attach the video files, I'll try to find a way to post up some videos.
The last couple months. I've noticed that when starting the motor cold, there is a very brief rattle right as the motor starts to turn over, and is gone as soon as the engine comes to life (gone before rpm's come up). Almost like a really fast snare drum triple. I tried recording it with the hood popped, but couldn't hear it - it's most noticable from the cabin (but sounds like it's coming from the engine bay). It correlates to when the engine shakes on startup before getting up to idle speed. It doesn't do it when the motor is warm, it has to be cold.
I've asked the shop about it, but of course they can't hear what I'm hearing. I asked them if it could be shot motor mounts and they weren't open to this idea.
I know valvetronic motors can click, but everything thing I've read about bad valvetronic is it clicks when un-locking the door before starting the car - I've never heard that from my car.
Any ideas what this it? Shot motor mounts allowing parts to contact briefly that shouldn't normality contact?
I can't seem to attach the video files, I'll try to find a way to post up some videos.