Head gaskets were replaced due to coolant in oil. It did not overheat.
Upon reassembly, a no start condition was encountered. This was solved by installing a used ECM and having it reprogrammed by the Chev dealer. Along the way, the Crank Sensor and the Cam Sensor were replaced.
Currently, after overnight cool down, it runs poorly until normal temperature is reached. During the warmup period, the "check engine light" flashes continuously. When warm, the engine smooths out and the light stays on solid. P0305 is set. Compression was verified at 150 +/- 10 when reassembled. New plug wires were installed. #5 plug was switched with #1, resulting code still P0305. An adjustable spark tester verifies spark at 30,000 on #5 when warm.
Code scanner read coolant temp at 51C when cold and 89C when warm.
Will test #5 spark tomorrow morning with engine cold.
I suspect injector or poppet problem. Can the spyder system be tested if removed from the engine? If so, who can test it?
In the meantime, any suggestions will be welcomed.
Thursday, June 20th, 2013 AT 4:24 PM