The third “barrel” of this carb feeds the required rich mixture into the engine’s precombustion chamber. When someone monkeys with the third-barrel linkage adjustment, he can easily upset the carb’s entire mixture range!
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When is a vacuum leak not a vacuum leak?
When it’s hiding in the EVAP system of a Porsche Cayenne.
A P0455 code points to an EVAP problem, but the EVAP system checks out OK with our smoke tester. And the purge valve checks out as well. So where could the problem lie?
Our derFix Super Sleuths unravel the mystery.
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