Diagnostic tool for Peter

[PeterAllen]

Thanks David, I'll follow up.

What prompted the post was after I reassembled the mechanicals following a 3-4 years break, to my delight, the LS1 fired up straight away. The only note of interest was while I was in the cabin turning the key an observer said a puff of smoke came from the throttle body area as I turned the key. I thought perhaps it was dust burning off the MAF which is attached directly to the throttle body. As I understand it the MAF has a hot wire filament(?).

Anyway, when I pressed the starter button it burst into life. I just let it idle and spent time checking for leaks, etc. Later when I started it again I got no response from the throttle - it just idles.

I read where someone with a similar no-DBW response the owner found the motor in the throttle not working. Considering the puff of smoke on the initial turn of the key I thought perhaps the butterfly was stuck after the period on non-use and caused the motor to burn out.

I have also read that when the ignition is switched on the butterfly opens and closes quickly before the engine starts. I figured if mine did this then the butterfly motor should be okay. I had someone turn the key but what I did observe was the butterfly actually close from a slightly open position????

Any suggestions on how I might progress fixing this problem. Thanks.

PS. Don't suggest a cable.