Car: Audi S5 4.2L 8 cyl, 6 speed manual
Purpose: I want to clean the carbon build up on the intake ports and valves.
The reason: Not all the valves are closed at the same time, and so the engine needs to be turned to open any remaining valves.
- To crank the engine from the crankshaft pulley, a special tool is required which I don't have.
- The car has a push button start, so it's hard (not impossible) to crank the engine for a very short period of time (need to release the clutch very quickly for it to stop cranking)
- I tried putting it in 6th gear with the handbrake down and pushing the car (with 2 people), but it required a lot of effort (rocking the car forward) and not sure how effective it is.
What would be a safe way to crank the engine? I'm not sure how safe the releasing clutch method is. It also involves removing the spark plugs so the injectors don't pop out. Not sure of any other damage doing this a few times.
Regarding the pushing method, is there a reason why it was so hard to push in 6th gear? The car was off for about 1 hour, so I'm not sure if there would still be compression in the engine. Also, being such a high gear ratio, I'm not sure how far I'd have to push the car to close the open valves...