[czrny]

I've removed the intake and reinstalled it after cleaning. Torqued the intake to spec: m6 bolts - 10Nm, m7 nuts - 15nm. Engine is stock with DPF and swirl flaps in place.

Immediately after startup I've noticed increased engine cover vibration - retighten slightly intake bolts and nuts but the issue persists.

On cold start I'm feeling vibration while in driver's seat with very intermittent jump in RPM. Apart from that no issues and no error codes.

I wonder where I've messed up - I guess it's a leak either in intake manifold or vacuum system (engine mounts). Thanks for any ideas / suggestions.

[lnxguy]

You probably have a vac line stuck under the intake manifold. Happens often if you aren't paying attention. Take it off again and make sure.

[czrny]

Originally Posted by lnxguy

You probably have a vac line stuck under the intake manifold. Happens often if you aren't paying attention. Take it off again and make sure.

Thanks to your suggestion I've re-checked all the vacuum lines. Those near the intake manifold were fine but the ones lying on bottom engine cover were not.

Found this loose connection - pic attached. Pretty sure that's vacuum line for engine mounts.

[lnxguy]

Good bet!

[czrny]

Originally Posted by lnxguy

Good bet!

After closer examination vacuum lines for mounts seemed to be fine.
Instead I've removed MAP sensor, cleaned it and replaced rubber grommet.

Good so far (1 day of driving) I'm gonna call it a win for now.

[lnxguy]

It's crazy how loose that MAP grommet can be lol

[czrny]

Originally Posted by lnxguy

It's crazy how loose that MAP grommet can be lol

Probably because it tends to loose some of its parts.

[BB_cuda]

For the reason you show in the picture, I leave the MAP sensor inserted into that grommet and disconnect the harness side. I pull intake with MAP left in place. My motto is minimize the stress on something known to break.

Were you able to source another grommet?

[czrny]

Originally Posted by BB_cuda

For the reason you show in the picture, I leave the MAP sensor inserted into that grommet and disconnect the harness side. I pull intake with MAP left in place. My motto is minimize the stress on something known to break.

Were you able to source another grommet?

Good approach, guess it comes with experience. I've examined the intake after removal - nothing found inside. Only after looking into vibration I've checked the MAP sensor and grommet .. the missing part probably got consumed 100kkm ago or who knows.

Sourcing part was easy, no issues here.

Still getting intermittent vibration, rpm jumps .. so, not fixed, yet.