Quote:
Originally Posted by Scott ZHP
I love it too, but the early implementations are really prone to carbon buildup.
My 12 A4 is a perfect example. At 70k miles, I had to pull the intake and decoke the exhaust ports, valves/stems and guides. The amount of carbon buildup was shocking. For 13+ VW/Audi installed a second injector to keep the valves clean.
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Yea the carbon buildup is the biggest problem with them, along with the hpfp's going bad quickly from how much work it's doing. When the 2.0T came out the hpfp's were quickly failing since it was all still a new concept.