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one.D'RIVE: Problem With Direct Injection Engines
http://ahw308.blogspot.com/2012/04/problem-with-direct-injection-engines.html
All about myPeugeot interests - RCZ, 208, 308, 508. April 01, 2012. Problem With Direct Injection Engines. One of the problems with direct injection. Turbo) engines like EP6-DT engine family, is getting excessive tar like coating in the intake manifold, and a nasty carbon build-up on the back of the intake valves once the car had clocked around 50,000km as shown below - hence one of the contributing factors to the infamous knocking problems. Where did this ' black substance. April 2, 2012 at 9:54 AM.