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Author Topic: Car idle speed raising on its own and dropping lumpy. Video  (Read 5759 times)

Offline smithyc1987

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Car idle speed raising on its own and dropping lumpy. Video
« on: January 15, 2014, 07:41:36 pm »
As title my 2008 gti 55,000miles full vw history.
The idle keeps raising on its own then falling then repeating.
Heres a quick video,
Please excuse my daughter in the background.
Any help or ideas appreciated.

Saintsteve

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Re: Car idle speed raising on its own and dropping lumpy. Video
« Reply #1 on: January 15, 2014, 07:56:44 pm »
Blown PCV valve  :smiley:

Offline doylebros

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Offline smithyc1987

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Re: Car idle speed raising on its own and dropping lumpy. Video
« Reply #3 on: January 15, 2014, 08:35:55 pm »
Cheers lads, easy/expensive fix?

Also the temperature dosent seem to get up to middle as easy sometimes and drops and rises

Offline doylebros

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Re: Car idle speed raising on its own and dropping lumpy. Video
« Reply #4 on: January 15, 2014, 08:49:09 pm »
Cheers lads, easy/expensive fix?

Also the temperature dosent seem to get up to middle as easy sometimes and drops and rises

Read this (relevant section):-

http://www.mk5golfgti.co.uk/forum/index.php/topic,44709.0.html

20 minutes should sort it for the PCV valve.

The cooling temp may need to develop but there's a few interesting threads on cooling problems like this

http://www.mk5golfgti.co.uk/forum/index.php/topic,75756.0.html

Offline smithyc1987

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Re: Car idle speed raising on its own and dropping lumpy. Video
« Reply #5 on: January 16, 2014, 12:54:45 pm »
Done the test and removed sipstick engine splutters when put back in all is well.
So not the pcv valve.
Throttle position sensor ?
It only seems to do it when warm

Saintsteve

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Re: Car idle speed raising on its own and dropping lumpy. Video
« Reply #6 on: January 16, 2014, 06:20:14 pm »
Done the test and removed sipstick engine splutters when put back in all is well.
So not the pcv valve.
Throttle position sensor ?
It only seems to do it when warm

Still PCV  :wink:

Offline smithyc1987

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Re: Car idle speed raising on its own and dropping lumpy. Video
« Reply #7 on: January 16, 2014, 09:51:31 pm »
Y y y y ??????

Saintsteve

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Re: Car idle speed raising on its own and dropping lumpy. Video
« Reply #8 on: January 17, 2014, 06:17:35 pm »
Y y y y ??????

If you've never replaced it, for the sake of £37 I would.

Offline smithyc1987

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Re: Car idle speed raising on its own and dropping lumpy. Video
« Reply #9 on: January 18, 2014, 03:38:52 pm »
Also seems to be slightly running on for split second longer after ignition is switched off????

Saintsteve

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Re: Car idle speed raising on its own and dropping lumpy. Video
« Reply #10 on: January 18, 2014, 06:23:26 pm »
Also seems to be slightly running on for split second longer after ignition is switched off????

Change it, and report back   :happy2:

Offline rich83

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Re: Car idle speed raising on its own and dropping lumpy. Video
« Reply #11 on: January 19, 2014, 12:46:31 am »
Done the test and removed sipstick engine splutters when put back in all is well.
So not the pcv valve.
Throttle position sensor ?
It only seems to do it when warm

If you pull the dipstick out and it runs rough, and when you put it back in it still runs roughy it's the PCV.

I think Steve might have mentioned it once or twice already.  :laugh:

Offline smithyc1987

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Re: Car idle speed raising on its own and dropping lumpy. Video
« Reply #12 on: January 19, 2014, 09:47:40 am »
No when i put dipstick back in it runs fine.

Offline rich83

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Re: Car idle speed raising on its own and dropping lumpy. Video
« Reply #13 on: January 19, 2014, 09:58:56 am »
No when i put dipstick back in it runs fine.

Well if it runs fine then you dont have a problem!  :laugh:

Offline EddieA

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Re: Car idle speed raising on its own and dropping lumpy. Video
« Reply #14 on: January 19, 2014, 10:11:31 am »
Exactly the same as what I had, sometimes it would do it and others it wouldn't. It's the pcv, change it and it'll be fine.
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