VW/Audi 2.5 R5 TDI Engine Specs, Problems & Reliability This engine is the 2.5-liter 5-cylinder inline turbo diesel engine with pump injection system. Its life began in 1989. The engine was designed and developed by Audi, and it was the first Turbocharged Direct Injection engine in the production.
I have got a VW T4 2.5 TDI with a lack of power, engine code ACV. It had fault codes relating to the engine coolant temp sensor and also the fuel temperature sensor inside the fuel pump. Both the sensors have been replaced and the fault codes cleared, I have adjusted the pump timing as it was
The T4 has two belts one on the engine side & one on the pump side both are timed from the pump side & many mechanics don't seem to be able to get their heads around this. So they default to using tippex. This method will not time your van anywhere near the required accuracy. It needs setting using software on a computer normally VCDS.
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