GreenSharanTdi Posted June 27, 2015 Report Share Posted June 27, 2015 Hi all, have always had the dreaded limp mode ever since I've had my Sharan (about 3 years) but have always put up with it as only normally does it when cold. Recently started getting pressurisation in cooling system, and after the normal routine of changing everything had to accept it was head gasket! Well £600 later the pressurisation has gone but the overboosts were becoming more frequent so after trawling the forum started fiddling and a couple of days ago removed and cleaned the map sensor. Since doing this the boost seems better but last night the car developed a hissing under boost, i've had a look but just can't seem to trace it or see an obvious pipe in the area of the hissing. It can be heard on tickover but gets louder the harder the car is driven. It's coming from somewhere around the aternator area by the sounds of it so maybe a small vacuum pipe maybe? Any ideas please? 2000 115 AUY Mk2 Quote Link to comment Share on other sites More sharing options...
chrispb123456 Posted June 27, 2015 Report Share Posted June 27, 2015 You need to get the under cover off and check turbo outlet and intercooler you can't see these from above.Why didn't you clean the turbo vanes while you had the head off? Quote Link to comment Share on other sites More sharing options...
GreenSharanTdi Posted June 27, 2015 Author Report Share Posted June 27, 2015 Vanes all cleaned while head off and turbo sounds happier, undertray not on. Sounds higher up than intercooler Quote Link to comment Share on other sites More sharing options...
xavier Posted June 27, 2015 Report Share Posted June 27, 2015 cleaned how? Quote Link to comment Share on other sites More sharing options...
GreenSharanTdi Posted June 28, 2015 Author Report Share Posted June 28, 2015 cleaned how?Stripped, de-coked and v high temp grease used when put back together Quote Link to comment Share on other sites More sharing options...
chrispb123456 Posted June 28, 2015 Report Share Posted June 28, 2015 What have you put grease on? the moving parts E.G. unison ring and nozzle levers should be clean and dry, any grease or oil mixed with soot will aid premature sticking. Quote Link to comment Share on other sites More sharing options...
GreenSharanTdi Posted June 28, 2015 Author Report Share Posted June 28, 2015 What have you put grease on? the moving parts E.G. unison ring and nozzle levers should be clean and dry, any grease or oil mixed with soot will aid premature sticking.Not got sticking vanes now it's the boost leak that's the problem Quote Link to comment Share on other sites More sharing options...
chrispb123456 Posted June 28, 2015 Report Share Posted June 28, 2015 Sphere shaped vacuum reservoir has a single pipe behind alternator Quote Link to comment Share on other sites More sharing options...
GreenSharanTdi Posted June 28, 2015 Author Report Share Posted June 28, 2015 Sphere shaped vacuum reservoir has a single pipe behind alternatorThanks, sounds like a possible place, definately in that sort of area Quote Link to comment Share on other sites More sharing options...
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