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Rough idle and engine shaking?

Tiny
LUKEMANGO
  • MEMBER
  • 2010 SEAT IBIZA
  • 1.6L
  • 4 CYL
  • TURBO
  • 2WD
  • MANUAL
  • 94,000 MILES
The car idles rough and the engine shakes, I have a video of it occurring attached. My bets are either the EGR valve or engine mounts, but any advice is appreciated.

Video if attached doesn't work: https://streamable.com/p2yk82
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Saturday, August 12th, 2023 AT 2:41 AM

17 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,505 POSTS
Thanks for the video. It looks like the engine mounts need to be replaced. The engine sounds like it is running okay. Does the engine smooth out when just above idle? If so, the mounts are bad.
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Saturday, August 12th, 2023 AT 3:32 PM
Tiny
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Yes, the engine runs fine when not in idle.
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Saturday, August 12th, 2023 AT 4:16 PM
Tiny
KEN L
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Yep, the engine mounts are worn out. It happens. I have asked our Euro expert to chime in with engine mount replacement instructions.
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Monday, August 14th, 2023 AT 11:12 AM
Tiny
LUKEMANGO
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  • 10 POSTS
Much appreciated, took it to a garage today and they confirmed it was the lower engine mount (gearbox stabilizer), will look to rectify soon.
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Monday, August 14th, 2023 AT 2:58 PM
Tiny
BORIS K
  • MECHANIC
  • 800 POSTS
Hello,

The gearbox stabilizer is called a pendulum support. See image 2
It is mounted into a recess in the subframe and attached with 2 bolts on the lower transmission housing, see image 1.

When replacing the support, you will need to replace the 3 bolts too.
The 2 bolts at the transmission side are tightened to 30Nm + 90 degree.
The bolt at the subframe is tightened to 40Nm + 90 degree.

It is a fairly simple install as the transmission will not drop when loosening the mounting.
Suggest to first remove the 2 transmission side bolts.
Next loosen and remove the bolt at the subframe.
The mounting is quite tight in the recess, you will need to wiggle it out using a small pry bar or large flat screwdriver. Fit new mounting into the subframe recess first.
Install new bolts and tighten to correct torque using a torque wrench and angle attachment.
See image 3 for angle attachment.

Cheers, Boris
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Tuesday, August 15th, 2023 AT 12:52 AM
Tiny
LUKEMANGO
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Thank you. I will let you know how I get on.
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Tuesday, August 15th, 2023 AT 5:47 AM
Tiny
KEN L
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Please do!
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Tuesday, August 15th, 2023 AT 8:43 AM
Tiny
LUKEMANGO
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Well, that didn't work, still occurring, video attached.
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Friday, August 18th, 2023 AT 5:31 AM
Tiny
KEN L
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Hmm, you may have low compression in one of the cylinders. Let's see what Boris says when he sees the video.
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Saturday, August 19th, 2023 AT 8:58 AM
Tiny
LUKEMANGO
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Sounds good.
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Monday, August 21st, 2023 AT 1:47 PM
Tiny
BORIS K
  • MECHANIC
  • 800 POSTS
Hello,

The video certainly seems to show a misfire, but not constant
Being a diesel engine my first check would be a possible diesel injector issue.
Do you have access to a suitable diagnostic tool to check injector compensating values?
See image below
VCDS/VAG-COM would be the best tool for VW based products
A lot for sale online, diagnostic cable and software. You will require your own laptop computer.
Also check if you have any possible fault codes.

Carry out a CAN scan using a suitable diagnostic tool:
https://www.2carpros.com/articles/can-scan-controller-area-network-easy

A good video showing the 1.6 diesel engine:
https://youtu.be/RmbN936pXQ8

Cheers, Boris
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Tuesday, August 22nd, 2023 AT 2:48 AM
Tiny
LUKEMANGO
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I've got an OBD2 scanner that connects via Bluetooth to my phone, there's no fault codes showing up, although when the mass air flow rate spikes are when the engine shakes. Graph below.
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Tuesday, August 22nd, 2023 AT 3:35 AM
Tiny
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The app that I'm using is https://www.obdsoftware.net/software/obdfusion for reference.
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Tuesday, August 22nd, 2023 AT 3:37 AM
Tiny
LUKEMANGO
  • MEMBER
  • 10 POSTS
I should also mention that 2 days ago I took out the airbox and used some air flow sensor cleaner on the MAF.
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Tuesday, August 22nd, 2023 AT 4:03 AM
Tiny
KEN L
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Opps, the reading from the MAF sensor means you have a leaky intake valve. To confirm the issue, we can do a compression test, this guide should help:

https://www.2carpros.com/articles/how-to-test-engine-compression

Please go over this guide and get back to us.
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Thursday, August 24th, 2023 AT 10:00 AM
Tiny
LUKEMANGO
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Hi, I thought i'd update you as I took it to the SEAT dealership - it turned out to be an ECU software update that fixed it of all things, quite the goose chase in the end but we got there.
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Sunday, November 5th, 2023 AT 5:42 PM
Tiny
KEN L
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Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.
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Monday, November 6th, 2023 AT 8:31 AM

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