Thank you for the excellent video. Am shocked what a spaghetti-like complexity this job involves and how much room for mistakes exists--resulting in further problems down the road. I was forced to have the intake manifold replaced on my MY2006 W211 E350 (at about 100,000 km) after the check engine lamp illuminated due to a tumble flap error. The mechanics first attempted to replace the original plastic tumble flap with a better after-market metal component. However, I was told it proved impossible to remove or drill out the original flap. So, a new intake manifold was the only option. The sad thing is that I expect perfection in all jobs and am willing to pay for extra hours (at $70 Australian) to attain it. Yet after so many jobs and major services I have to waste my time taking the car back to fix problems that should never happen: after a recent change of diff oil, I discovered the diff leaking oil when the drain plug hadn't been correctly refitted. Or, after a wheel alignment the steering wheel ends up not facing straight ahead when on flat concrete in a car park, or small damage occurs to the car and there are many other examples. I think much of this problem occurs due to trying to service too many cars and maximize owner profit. Also, the business definitely needs written procedures and checklists, with an overarching Quality System to ensure that every customer problem is corrected, investigated, documented and discussed at meetings to avoid repetition. I work in a hospital; we have such Quality Systems in order to avoid harming patients--mechanics need similar methods to avoid harm and excessive expense to customers and their machines. I apologise for expressing (or venting) this here, am truly sorry, because you are likely the opposite to what I've experienced, and are the mechanic I've always dreamed of and wanted :-)
