JonA Posted March 13, 2017 Share Posted March 13, 2017 Hi on our a3 2L tdi (170hp) there is a bit of an issue that I am struggling to get to the bottom of. in usual driving it all runs very smoothly, pulls nicely and all seems well, but when you ask a bit more . ie put your foot down, it pulls really well then at about 3400-3500rpm there is a big hesitation feeling almost as if it cuts out for a split second then back to full power. If you hold the throttle down these carries on as it accelerates hesitating every couple of hundred rpm or so. Garage tells me there are no fault codes - the crank shaft sensor was showing a fault but this has now been replaced and all seems cleared. Anyone have a similar experience and fix or advice? regards Quote Link to comment Share on other sites More sharing options...
Trevor Posted March 15, 2017 Share Posted March 15, 2017 It could be turbo related as this is around the rev range that it should go onto boost. Maybe run some cleaning additives through the fuel and also through the turbo to eliminate it Quote Link to comment Share on other sites More sharing options...
BiPolarGhost86 Posted March 15, 2017 Share Posted March 15, 2017 12 hours ago, Trevor said: It could be turbo related as this is around the rev range that it should go onto boost. Maybe run some cleaning additives through the fuel and also through the turbo to eliminate it I agree with this. There is a company that comes to your home/work and completely carbon cleans your engine. Maybe worth looking into. Quote Link to comment Share on other sites More sharing options...
rbdazza Posted March 15, 2017 Share Posted March 15, 2017 I assume you've checked the basics and at least replaced the fuel filter? i wouldn't go paying out for a carbon clean just yet but a bottle of redex or the like certainly would be worth a try. Quote Link to comment Share on other sites More sharing options...
JonA Posted March 28, 2017 Author Share Posted March 28, 2017 Hi sorry for delay in coming back I've previously run a liquimoly diesel purge through and changed the filter. this had no appreciable effect. Quote Link to comment Share on other sites More sharing options...
Trevor Posted March 28, 2017 Share Posted March 28, 2017 Onto the turbo cleaner solution or Terraclean then....that should sort it Quote Link to comment Share on other sites More sharing options...
Dan3222 Posted April 24, 2017 Share Posted April 24, 2017 I actually think it sounds like the turbo impellar is vibrating at higher revs. Just due to wear, it comes into contact with the sides. Obviously first step is to clean but I do think you will to replace turbo before long. look up Wheeler Dealers Saab turbo episode. is your car between 60 - 70k by any chance? Quote Link to comment Share on other sites More sharing options...
JonA Posted April 25, 2017 Author Share Posted April 25, 2017 hi the cars done a little over 100k .... Quote Link to comment Share on other sites More sharing options...
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