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My car is 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 about 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 tool and informing me that it was set to 8nm, but in reality, it was set over 56nm, as confirmed by a mechanic when I presented them with the torque wrench.

My mechanic friend partly drilled the broken bolts but did not completely remove them. He installed a larger thread and replaced the bolts with shorter, but thicker ones. I tightened them with a torque wrench, but one of the two bolts took many further spins to get securely tight.

Currently, when I turn the key, the car's engine is rotating, but it is not starting and is making a loud chuffing noise. My friend suggests that this might be due to a faulty fuel injector, but we cannot determine which specific injector 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, and I am considering if this may be the cause of the car's failure to start.

I kindly want assistance.

To diagnose a potential fuel delivery issue, I suggest introducing brake cleaner or easy start into the air intake after loosening one of the injector fuel pipes. 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 briefly ignite with the assistance of the easy start, which will hopefully eliminate any air blockages.

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

Do you know the intended destination for that connector?

The connector is not used in your engine.

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

\It does have a function ......but not when used on your vehicle.

I am perplexed by the purpose of its being on my automobile, to be honest.

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 on earlier automobiles, especially if that specific model had a wide range of options for customers to choose from when placing an order.

Producing a limited number of wire looms for all automobile types was more convenient and cost-effective. Although this may seem inefficient by today's standards, it was the common practice when some cars featured manually operated rear windows but electrically powered front windows, as well as heated or non-heated side 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.

ok