MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: Dcra on March 09, 2024, 12:51:40 pm

Title: Down on power
Post by: Dcra on March 09, 2024, 12:51:40 pm

Hi all,
New here. I've recently acquired this 2005 gti. Totally stock,very clean,fsh with 80k miles. Got timing belt and wp done. Suspected it was a little down on power so had dyno test done and results pretty disappointing as you can seeCar runs well,no warning lights or fault codes. Replaced plugs with ngk iridium and also r8 coil pack but don't think it made any difference. Also checked cam follower which looks perfect.
Any other common causes for this kind of power loss. Just want it back to factory soec
(https://i.postimg.cc/bJvhjP99/FB-IMG-1709582309721.jpg) (https://postimages.org/)

(https://i.postimg.cc/SxpbxCGs/20231030-145701.jpg) (https://postimg.cc/2VTKHqMR)

Title: Re: Down on power
Post by: Lewo on March 09, 2024, 03:51:29 pm

Wow, lost about 50 horses there... Can't advise anything really and I'm no good with the spanners lol but is the timing correct, compression etc?

Title: Re: Down on power
Post by: Dcra on March 09, 2024, 04:03:56 pm

Yeah,pretty sure all good there. As I say,car seems to run fine,pulls through all the gears but obviously not where it should be.

Title: Re: Down on power
Post by: GVK on March 09, 2024, 04:57:29 pm

Check the diverter valve , it's on the turbo on the K03 cars

Title: Re: Down on power
Post by: Dcra on March 09, 2024, 05:45:01 pm

Will do,thanks.

Title: Re: Down on power
Post by: MrChin on March 09, 2024, 06:56:05 pm

Yep - try the Diverter Valve first, new ones aren't expensive to buy or fit.  I noticed the Dublin plates, where did you get the dyno done? 

Title: Re: Down on power
Post by: Dcra on March 09, 2024, 07:01:09 pm

Will do. I presume it would be obvious to see if it was faulty ie.Ripped diaphram.
Got dyno done with jaf performance in monaghan.

Title: Re: Down on power
Post by: OllieVRS on March 09, 2024, 08:07:12 pm

If you could get a scan done - ideally VCDS - then that would give you an idea of where to start looking. And if you don't have VCDS yourself ask any mate with a VAG group car, there's bound to be one that owns it considering how often VAGs get check-engine lights for the stupidest of reasons  :happy2: