Hi Guys -

My dad and I have been restoring his 1982 El Camino for the last three years. He originally had a 305 TPI from an Iroc Z that has served him well. Enough power to do what he wants, still decent mileage. He decided he wanted to stroke it to have a little more fun. The stroker kit works out to a 334/335 (block bored .30, balanced, etc)

Also with this restore we decided to move to a 4L60E, which meant an ECM swap. Installed a 7427 with a BJLK because that seemed to be the most "universal" from other threads I've read.

First start, motor fired right off - nice smooth idle, plenty of power and low end torque, however on idle it sounds like a diesel - lots of timing ping. Retard the timing and it will go away, but then the motor is gutless. Open the throttle a bit and it goes away. It's also running hot on an idle, which is also why we believe this is a timing issue. Compression calculates out to 9.5:1, and we're running fresh 93 octane fuel.

Any thoughts? It looks like the ECM advances the timing quite a bit on an idle. We can connect a scan tool to the ALDL port to get any data to help solve this issue, and I have a PROM burner if I need to tweak the BIN.

Thank you in advance!