986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Engine vibration, droning, or shaking. Motor mounts related?

PLP · 05-13-2021, 08:35 AM

First the good things. It starts smoothly - hot or cold. Does not smoke on cold or hot under load/coasting/WOT.

Engine was not abused (a few thousand counts of Rev 1 range and just literally 2 ignition cycles on Rev 2 range).
Oil is OK.

110k miles, 2003, 2.7.

However, what I experience is some kind of shaking when coasting (kind of like jerking) and what most intriguing - weird almost like hard mount or metal to metal vibration at around 2100-2300 rpm. It goes away at 2400 rpm (completely). It is not there at 1800 rpm at all. In each gear (well, I tested 3, 4, and 5).

Another reason for mounts is that it is somehow ambient temperature dependent problem.

Sine it revs fine, power is there - I kind of excluded engine related issues.
I have not had a chance to put on a hoist to see the mounts, but that is where I am going to.

So what do you think it could be?

Oh, yeas, it is my freshly acquired Boxster that did not have PPI as... since I could not really find anyone to do that before my arrival, and it was a very cheap deal, so I checked all guts myself with crawling under the car.
But sure, unleash the missed PPI complaints...

And then advise what to look for.

I am planning on having post-PI. Maybe...

IMS - status unknown. Per previous owner - no indication on the filter.

05-13-2021, 08:35 AM	#1
PLP Registered User Join Date: Apr 2021 Location: Lansing, MI Posts: 350	Engine vibration, droning, or shaking. Motor mounts related? First the good things. It starts smoothly - hot or cold. Does not smoke on cold or hot under load/coasting/WOT. Engine was not abused (a few thousand counts of Rev 1 range and just literally 2 ignition cycles on Rev 2 range). Oil is OK. 110k miles, 2003, 2.7. However, what I experience is some kind of shaking when coasting (kind of like jerking) and what most intriguing - weird almost like hard mount or metal to metal vibration at around 2100-2300 rpm. It goes away at 2400 rpm (completely). It is not there at 1800 rpm at all. In each gear (well, I tested 3, 4, and 5). Another reason for mounts is that it is somehow ambient temperature dependent problem. Sine it revs fine, power is there - I kind of excluded engine related issues. I have not had a chance to put on a hoist to see the mounts, but that is where I am going to. So what do you think it could be? Oh, yeas, it is my freshly acquired Boxster that did not have PPI as... since I could not really find anyone to do that before my arrival, and it was a very cheap deal, so I checked all guts myself with crawling under the car. But sure, unleash the missed PPI complaints... And then advise what to look for. I am planning on having post-PI. Maybe... IMS - status unknown. Per previous owner - no indication on the filter.