MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: Raziel on April 12, 2021, 07:32:46 pm

Title: Rough engine
Post by: Raziel on April 12, 2021, 07:32:46 pm

Hi guys, went for a spirited drive at the weekend, car drove well but when I got home it sounded rough, when I turned the car off and restarted it sounded better. I have, a few months ago replaced the PCV, cam follower and cam chain and tensioner. I smoke tested the intake and there is a leak at the back of the engine around the rear PCV area, would that cause this or is it something else? Any help will be greatly appreciated.

Title: Re: Rough engine
Post by: maxamplitude10 on April 13, 2021, 04:23:37 am

Hi Raziel could you describe "rough" in a little more detail please?

Max

Title: Re: Rough engine
Post by: Raziel on April 13, 2021, 10:01:22 am

Lumpy and uneven idle, an a bit of a rattling sound.

Title: Re: Rough engine
Post by: DBXdarkangel on April 13, 2021, 09:04:29 pm

Quote from: Raziel on April 13, 2021, 10:01:22 am

Lumpy and uneven idle, an a bit of a rattling sound.

Can you post a video of the noise and are you able to check for fault codes?

Title: Re: Rough engine
Post by: Raziel on April 13, 2021, 10:04:05 pm

I do have a video but I don’t know how to post it.

Title: Re: Rough engine
Post by: Havelin150 on April 15, 2021, 08:27:16 am

Quote from: Raziel on April 13, 2021, 10:04:05 pm

I do have a video but I don’t know how to post it.

Upload to YouTube and post the link. I think that's your best bet.

Title: Re: Rough engine
Post by: mjmallia on April 16, 2021, 07:42:16 am

Any air leak will make it idle bad as the system is working in a vacuum state.

Title: Re: Rough engine
Post by: pudding on April 16, 2021, 09:47:03 pm

Need a decent scan tool really, to A) make sure no sensors are flagged as defective, and B) check the long term fuel trims.