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Matt, Mechanical Engineer
Category: Audi
Satisfied Customers: 22930
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Matt, have a 2010 Audi A3 1.6 TDI Sport. Engine mgmt(Diesel

Customer Question

Hi Matt, have a 2010 Audi A3 1.6 TDI Sport. Engine mgmt(Diesel engine) came on (for glow plugs) together with Emission control system light & soon after the power in the engine disappeared, so that if I was to put accelerator to the floor there would be hardly any revs & car goes at about 15mph... Car has done 23k miles & service light also displayed a month or so ago (last service was @ 17k.
Submitted: 2 years ago.
Category: Audi
Customer: replied 2 years ago.
Car has been serviced. Thus warning lights cleared down. Power issue remains. Garage seem unsure but suggested I agree to a process of elimination, first fitting a new 'turbo boost pressure centre'(or sensor?) at £46.20 for part. They stressed this may not cure problem. I am concerned that this may be a costly exercise & may be replacing perfectly good parts. They did not give me confidence. I had expected the system diagnostics to identify, rather than 'trial & error'😕 Please help/advise before I respond back to garage ??
Expert:  Matt replied 2 years ago.
Hellofrom your description 1st consider changing the fuel filter as if this partially blocked this will reduce pressure at the main pump If OK then also check the connections to the EGR valve, if either the vacuum pipe of electrical connection are damaged / corroded then the EGR can be on all time which certainly will hurt performance. Its also possible that its a fault with the EGR valve so its worth removing the valve and cleaning it out with brake cleaner, if it looks particularly clogged then replace it. If this is OK then check the small vacuum lines to the turbo and its connected control solenoid on the bulkhead, any cracks or leaks can give turbo issues and its best to have the boost pressure measured actually measured with a boost gauge to check that the turbo is healthy and that the sensor is reading correctly If its a variable vane turbo(they’ll be an actuator on the turbo body - but not a wastegate) then check its vacuum pipework as above and check the connections to the diaphragm / solenoid valve Also worth checking that the glow-plug relay is switching off as they can stick on and leave the glow plugs also on - on some cars this can force it into limp home Also worth considering addin ga bottle of injector cleaner into the tank as a clogged injector nozzle willreduce power and give poor combustion -the next stage on from this is to remove all the injectors and have them ultrasonically cleaned and flow checked Also check all the high pressure hoses post turbo/s for any split hoses or cracked metal pipes, also check the ends of the intercooler as its not unheard of to pop the end caps off under high boost.
Expert:  Matt replied 2 years ago.
do you still need help?
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Customer: replied 2 years ago.
Many thanks Matt for clear, thorough and concise answer. Much appreciated. KP 👌
Expert:  Matt replied 2 years ago.

glad to have helped


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