GolfGTIforum.co.uk
Model specific boards => Golf mk5 => Topic started by: Mk5blues08 on 08 September 2014, 22:28
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Hi all, I have a 2008 Gti and the radiator began to leak, so i had to top up water and a day or so later the turbo stopped working and the engine seems in limp mode , not letting me rev over 4000.
I have taken it to VW dealers twice for diagnostics and had the cut off valve and the map sensor replaced so far and no difference at all.
I am going to replace the radiator and hope this somehow sorts it, if not what are my options? I'm not sure it's the turbo itself?
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You might be better finding someone local with VCDS to have a scan of your ECU and see or find a good independent garage, the dealers aren't the best for diagnostics as they're just trained fitters and not mechanics.
2 main points worth checking, don't know if they'll be related, but you'll want to review your diverter valve (DV) and your pressure control valve (PCV).
The PCV is easy enough, with the engine running at idle, remove the dipstick quickly (but don't leave it out for more than a second or two). If the engine tries to stall, the PCV is fine but if it continues to idle at normal revs, the PCV is gone.
The DV will need to be unbolted and removed for inspection. This is a little more involved but not beyond a home mechanic with a trolley jack and a decent socket set with torx fittings. Common problems are the rubber diaphragms in earlier revisions splitting resulting in a real lack of power from the engine. You can either replace with a new version (D or G) or go for an after market upgrade, like a GFB DV+ or Forge option.
These may not solve your problems but worth checking none the less! Good luck.
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All these single post wonders with naff Mk5 GTIs'. Please realise you have bought a high spec car from a very lowly shopping/school trip range of cars. They don't last well.