The Chrylser upgraded automotive gas turbine engine as built to the original design was deficient in power and had excessive specific fuel consumption. As part of a corrective action program NASA tested a highly instrumented version of the engine to identify the sources of the engine problems. Analysis of the data shows the major problems to be low compressor and power turbine efficiency and excessive interstage duct losses. In addition, high HC and CO emissions were measured at idle, and high NO//x emissions at high engine speeds.