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Author Topic: Slight power loss  (Read 1941 times)

Offline Rocket-Ron

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Slight power loss
« on: 27 February 2011, 09:38 »
Hi Guys

My 05 plate GTI was running really quick but now seems to have lost a little power & also the revs seem to be sticking on when i boot it.
It just feels like its holding back on power where as before it was rapid right through the revs....Any ideas what area i need to be looking at?

Cheers
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Offline bacillus

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Re: Slight power loss
« Reply #1 on: 27 February 2011, 10:49 »
Diverter valve may have a small tear...
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Offline Hurdy

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Re: Slight power loss
« Reply #2 on: 27 February 2011, 10:50 »
1st point of call would be the Diverter Valve (DV). Do you have a stock DV? If so they are prone to tearing and the upgrade path is to the revision D type, which is a piston DV rather than a diaphragm DV :smiley:
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Offline Hurdy

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Re: Slight power loss
« Reply #3 on: 27 February 2011, 10:51 »
Quote from: bacillus on 27 February 2011, 10:49
Diverter valve may have a small tear...

Beat me to it whilst typing! LOL.
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Offline keyser

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Re: Slight power loss
« Reply #4 on: 27 February 2011, 12:36 »
Like the other guys said, diverter valve.  I had an 05 GTi and the same thing happened.  2005 GTi's have the B version diverter valve which is weak, particularly after a remap.  It is also known as a cut off valve.  When I went to my VW dealership they didn't know what a diverter valve was!  I should have the part number somewhere if you need it.
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MK5 GTI, manual, silver, dirty pipes.

Offline Rocket-Ron

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Re: Slight power loss
« Reply #5 on: 27 February 2011, 12:49 »
Cheers Lads

I was thinking air-flow,Thing is there is no fault light on,But now im glad i asked.....If you can dig out a part number that would be great...Any idea of cost?
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Offline keyser

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Re: Slight power loss
« Reply #6 on: 27 February 2011, 13:02 »
The part number is 06f 145 710 g.  The G refers to the version.  Your part number will be 06f 145 710 b.  There may be a newer version now as I bought mine in 2008.  It cost me £35.  You will need to take it to a mechanic to replace it unless you are handy yourself.
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MK5 GTI, manual, silver, dirty pipes.

Offline Egbutt Wash

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Re: Slight power loss
« Reply #7 on: 01 March 2011, 13:33 »
It's a little valve to get rid of unwanted air from the turbo, usually when you change up a gear.  If it's ripped then the nice high airflow from the spinning turbo will be wasted.  Those early ones seem as strong a wet paper bag.
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Offline hmeah

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Re: Slight power loss
« Reply #8 on: 22 May 2011, 17:20 »
Im feeling lost of power too, i put my foot down and nothing happens like before...
How do i check to see if its the DV thats got a rip/gone?

My 07 gti is a wald remap, after getting it serviced by VW (Jan) it feels slower, would they have reset it or something?

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