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I'm having the same problem right now with my 73 T337G. This is a problem that has grown worse lately.
At altitudes above 10,000 feet, when I start coming back to cruise power, the rear engine will not hold manifold pressure at less than 2500 RPM.
My mechanic tested for leaks in the induction system by pressurizing with a vacuum cleaner exhaust, and he replaced one of the rubber hoses that connect that sections of metal ducting. He cleaned out the waste-gate actuator, from which he removed a rather large particle of carbon. Yet, on the test flight today at 17,000, the problem remains.
In his reply below, Kevin says that one has to use 2500 RPM if one wants to hold manifold pressure at the higher altitudes. Well, yes, 2500 works. But, surely, it's not supposed to be this way. The front engine can be brought back to 2350 without losing manifold pressure.
Any advice?
Gordon
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