Release the Cancel button once the LED lights come on. This resets both the printer and the NVRAM together. Press and hold the Reset button near the back of a 5P or 6P printer as you turn on the power. Holding it for less than 20 seconds resets the printer only.
Once the throttle body is exposed, spray the throttle-body cleaner inside the air duct, and use the brushes to gently dislodge the dirt, gum and varnish that are present. Note: Be very careful not to let the thin, plastic spray nozzle (or anything else!) fall into the throttle-body opening.
Crude example - if the chosen throttle body is so big, that at 80% throttle opening, it's able to provide the engine with all it's airflow requirement, then opening it further does nothing. In a more complicated analysis, the throttle body is a tuned parameter. â chilljeet Feb 4 '16 at 5:59