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Over the past few years we have tuned a lot of PPD engines and suffered many problems along the way.These share pretty much all of the hard engine components as the BKD, but both engines have totally different issues, especially when we begin to tune them.InjectorsThe PPD engine run on a Siemens / Continental Injection and Management system. When these cars were fairly new, the Siemens injectors failed regularly. As soon as cars were out of warranty customers were faced with £300 per injector fa …