Question about Audi A4

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I own a 2000 audi a4 1.9tdi 115 se salon which has done 125000 miles. during driving the turbo seem to loss its thrust during some of the revs. its very strong when the boost comes in but falls of after a few seconds. this doesnt happen all the time just sometimes. the car doesnt smoke, has had its cambelt changed, a full service and injector cleaner flushed through. please help..... mark.

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  • cairnsman Nov 15, 2008

    i have a audi a4 2001. sometimes car will not rev out right and turbo is late and when turbo come in it a big burst of power i cant get to the bottom of it need help

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I guess your car goes in "limp mode". If you scan the EDC-15P engine computer with a VAG or KTS -BOSCH diagnosis tool you will find this: "Fault code: P1557 - Turbo Boost pressure control exceeded"
You must try follows if you are able to do this:
1. Engine stooped and ignition switch off. Check all pneumatic connections and hoses between turbocharger actuator = pressure unit for boost-pressure control, boost-pressure control solenoid valve, vacuum reservoir, EGR control solenoid valve, intake-manifold flap solenoid valve, EGR valve with throttle - part of intake manifold. Also the vacuum connection between tandem pump and brake booster. If you find something wrong replace parts. If not go to the step 2.
2. Extract the hose of the turbocharger actuator = pressure unit for boost-pressure control part of turbocharger. Instead of the original hose you must place another 1 meter long hose with the same inside diameter, and then you check to inspire yourself the air from the other one extremity of this hose. The mechanical connecting rod of the turbocharger actuator must have a smooth and whole motion. If you can do that with your mouth, then you must replace the boost-pressure control solenoid valve. If you can not reach this with your mouth, then you go to the step 3.
3. This is the most difficult work. The problem is that the soot particles deposits inside the turbocharger plugging the variable nozzle geometry mechanism of the turbine.
4. You must be able to extract the turbo from the engine and then to disassemble the turbocharger, clean inside and refit all.
Success !

Posted on Nov 19, 2008

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