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I own a 2010 Mercedes E class with a 3.0 V6 engine. The car's MOT has expired since January, and at the end of February, I brought it in for a MOT inspection. Unfortunately, it did not pass due to issues with the suspension and leaky injectors.

I have had a distressing and frightening dream related to it. Initially, I detached the leaky pipe from the injectors, which subsequently necessitated the acquisition of two new injectors due to the breakage of the connecting component. Furthermore, when tightening the bolts, two out of the six injector clamp bolts fractured inside the engine.
This occurred due to my neighbour lending me his torque wrench and assuring me that it was set to 8nm. However, when consulting a mechanic and demonstrating the torque tool, it was discovered that it was really set above 56nm.

My mechanic friend partly drilled the broken bolts, but did not completely remove them. He installed a larger thread and used shorter, however thicker bolts. I tightened them down with a torque wrench, but one of the two bolts took several additional twists to become securely fastened.

Currently, when I turn the key, the car's engine is rotating but not starting, and it is making a loud chuffing noise. According to my friend, this might be due to a faulty fuel injector, however it is uncertain which specific injector is causing the issue until the engine is running.
Currently, the vehicle is not starting, and I suspect that there may be an airlock issue. Additionally, there is a connection that I have been unable to locate its intended destination. I am considering if this connector might be the cause of the car's failure to start.

I need assistance.

To diagnose a potential fuel delivery issue, you may introduce brake cleaner or easy start into the air intake after loosening one injector fuel pipe. Attempt to start the engine, even if it doesn't start. This will allow you to see whether a enough amount of fuel is reaching the injector. The engine may momentarily ignite with the assistance of the easy start, and hopefully, this will eliminate any air blockages.

Thank you. Could you please tell me the location of the air intake?

Do you know the intended destination of that connector?

The connector is not used in your engine.

What is the point of the connection if it has no function?

It serves a function, but not on your automobile.

I am perplexed by the purpose of its being on my automobile, then, in a humorous manner.

The use of the connection will be required for your automobile model, provided that it is equipped with a distinct engine.

Automobiles include a multitude of unutilized cables, connections, threaded holes/studs, and empty spaces concealed by trim covers. It is particularly significant for older automobiles, especially if the specific model offered a wide range of choices for customers to choose from when purchasing.

Producing a limited number of wire looms for all automobile models was a more convenient and cost-effective approach. Although this may seem inefficient by today's standards, it was a common practice when some cars featured manually operated rear windows, electric front windows and heated or non-heated wing mirrors.

Here is a recent example where Jaguar chose not to create a separate engine block for its V6, but instead opted to deactivate a few cylinders.

The location of your air filter may be identified by locating the hose that leads into it.