Oscillating drone from engine at idle

Post by **vtl** » 24 Oct 2016, 19:40

VVT hub and solenoid on each camshaft on this engine, so 2 in total. Soleniods are hidden under plastic cover. You can unplug it when engine is idling. Make sense to disconnect only one at a time to triage which side is at failure.

keaunym · Post by **keaunym** » 25 Oct 2016, 19:01

Brought the tools to work but haven't had the chance yet and still at work. Will try to perform tonight in my driveway.

keaunym · Post by **keaunym** » 25 Oct 2016, 21:54

I was hoping to lay that mystery to rest but disconnecting each solenoid separately during idle did not make the sound go away. Here's a video that might help explain the sound better:

What do you suggest next?

Post by **vtl** » 25 Oct 2016, 22:31

On the video it's sounds like a failing A/C clutch bearing. Do you see the clutch engaging when you hear that sound?

Post by **vtl** » 25 Oct 2016, 22:34

Actually, check also the right engine mount. It sits behind right wheel. If its rubber is separated, engine will touch subframe. Do you feel excessive vibration on the chassis?

keaunym · Post by **keaunym** » 25 Oct 2016, 23:07

vtl wrote:On the video it's sounds like a failing A/C clutch bearing. Do you see the clutch engaging when you hear that sound?

Would the A/C being on our off have any affect? I've tested this and it doesn't. I'm not sure where I'd see the clutch engage.

keaunym · Post by **keaunym** » 25 Oct 2016, 23:08

vtl wrote:Actually, check also the right engine mount. It sits behind right wheel. If its rubber is separated, engine will touch subframe. Do you feel excessive vibration on the chassis?

Vibration doesn't seem excessive but I'll check for this mount tomorrow.

Post by **vtl** » 26 Oct 2016, 07:56

keaunym wrote:Would the A/C being on our off have any affect? I've tested this and it doesn't. I'm not sure where I'd see the clutch engage.

Look at the A/C, its pulley start spinning when the clutch is engaged.

keaunym · Post by **keaunym** » 26 Oct 2016, 08:56

vtl wrote:
keaunym wrote:Would the A/C being on our off have any affect? I've tested this and it doesn't. I'm not sure where I'd see the clutch engage.
Look at the A/C, its pulley start spinning when the clutch is engaged.

I'll check but I read if there are problems with the clutch, the A/C wouldn't blow cold air properly. It works fine.

Post by **vtl** » 26 Oct 2016, 12:25

keaunym wrote:I'll check but I read if there are problems with the clutch, the A/C wouldn't blow cold air properly. It works fine.

I wrote "bearing". Your noise cycling is very similar to A/C cycling, noise is a typical failing bearing noise.