MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: alextrea on December 26, 2014, 02:16:31 pm

Title: High/lumpy idling + a nice yellow warning light.
Post by: alextrea on December 26, 2014, 02:16:31 pm

Alright,

I have a problem.. Again. So i thought I'd come to you lot for advice to see if some knowledge could be shed. I have 06 GTI, 77k miles running an EVOM intake and milltek cat back and standard map.

Engine warning light came on couple of weeks ago and diagnostics showed it was running lean and the first lambda sensor was shot. Changed the lambda a couple of days ago, car was running fine.

Today, however, it's decided to come back on with the same symptoms as before, rough lumpy and high idling.

Anyone had the same problem or know what could be wrong?

Any help would be great as I want my car to stop being poorly :(

Title: Re: High/lumpy idling + a nice yellow warning light.
Post by: th3_f15t on December 26, 2014, 03:16:55 pm

Have any recent diagnostics told the same fault codes? Could be wiring more than the sensor itself. Other problems could be a faultly PCV or broken HPFP cam follower, neither of which will throw up a code but will effect the engine running.

Title: Re: High/lumpy idling + a nice yellow warning light.
Post by: ruhaleali on December 26, 2014, 06:20:54 pm

Have you checked the coilpacks could most likely be that!

Title: Re: High/lumpy idling + a nice yellow warning light.
Post by: Degudodger on December 26, 2014, 08:33:10 pm

Alex - Where abouts are you.

Might be worth checking the VCDS owner register to find your nearest member with VCDS who can do a quick scan for you. http://www.mk5golfgti.co.uk/forum/index.php/topic,88875.0.html (http://www.mk5golfgti.co.uk/forum/index.php/topic,88875.0.html)

Title: Re: High/lumpy idling + a nice yellow warning light.
Post by: Mrstridey on December 28, 2014, 10:53:38 am

Hi, had a similar problem and it was a silly little bit of plastic on top of the engine (valve) that had gone wrong and wasn't sealing properly.

When you turn the engine off do you get a hissing noise from the engine (might need 2 people)?

If yes try swapping the plastic bit, costs about £40 ishhh

Hope this helps!!

Title: Re: High/lumpy idling + a nice yellow warning light.
Post by: alextrea on December 29, 2014, 05:32:17 pm

Fault code coming up is b3800 ... Any ideas?

Title: Re: High/lumpy idling + a nice yellow warning light.
Post by: alextrea on December 29, 2014, 06:59:24 pm

Turns out it's a faulty tumble flap.

Could this be caused by a rather large intake damaging the flap?

Title: Re: High/lumpy idling + a nice yellow warning light.
Post by: th3_f15t on December 29, 2014, 07:56:21 pm

Probably, yeah... Will have put it under extra stress.