The only thing you're going to solve by cleaning the throttle body is a hesitation on acceleration, or a low idle speed. Even the low idle speed is pretty much a thing of the past with the better additives in today's fuels. That was caused by carbon build-up in the air passage around the throttle blade. GM never had a lot of trouble with that.
If you're not getting fuel, that has to do with the fuel supply system and the injectors. No fuel goes through the throttle body. Normally I would say to not get hung up on the first thing you find missing, meaning fuel, and check for spark too, but since it runs on starting fluid, we can assume spark is okay. Most no-start problems are caused by missing spark AND injector pulses.
Removing the fuel line isn't conclusive either because you need to know exactly what the pressure is. A lot of GM vehicles won't start if the pressure is just a few pounds lower than specs. Typically they call for around 45 to 50 psi. In the classes I attend, they always talk about low fuel pressure on GM trucks, and the cause is a weak fuel pump, but I don't know how common that really is.
Thursday, January 29th, 2015 AT 5:37 PM