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Seen it plenty of times. Its called a harmonic balancer designed to take vibrations away from the crankshaft. Its basically a rubber bush inside a metal housing. The rubber breaks down and falls out causing a huge vibration on the crank.

If you have 4 bar at the HPP that confirms the delivery pressure. Why fit 3 HPPs?! If 2 dont work (the original and the replacement) it cant be the HPP. To my knowledge there is no ECU cut out for the HPP, its done via rail pressure monitoring (the sensors on the end of the rail). You can...

Just a failure as far as I can remember. Electrics, they either work or they dont.

£1200-ish

Good job I am;) I've tried to give you the best advice based on my experience.

Again, what does that mean? Because 2 bar of fuel will pee out everywhere and give the impression of good fuel pressure. But its not enough to power up the HPP into giving good rail pressure. Thats why they need to measure it. A weak delivery pump can still give good pressure but not good...

Do you have any fault codes? Why did you replace the MAF sensor?

I'm not aware of any diagnosis equipment that will condemn a HPP. I think you need to go all the way back to the start and carry out your diagnosis. Or the garage does. Do you have delivery pressure from the tank? If yes - move forward. If no - you have an issue with the fuel pumps in the...

In his profile it says he drives a ML320CDI....so ill assume its a W164. Crank pressure is irrelevant as hes already replaced the HPP and its not starting. Fuel delivery pressure from the tank is the first thing to check. It needs 3.8-4.2bar. If you havent got that it wont start in a month of...

That rail is just a guide and does nothing to tension the chain. If the chain is noisy/rattling/stretched you need to find out why. Like I said, its usually the gears on the end of the camshaft.

Occasionally get faults with the actual MAP and pressure sensors and they have been modified.....could be that. The algorithm must be equal across all 3 sensors, if not it will kick up a code. The fact it wont clear and comes straight back says its more sensor related. If it was an air leak...

Have you got fuel delivery pressure from the tank to the HPP? 2 ways of checking that, either with a fuel pressure tester or with a Xentry machine. Sounds like you're throwing parts at it without actually doing any proper diagnosis. The most expensive and frustration way to fix a car.

No one I could recommend. Put it this way, I'm just south west of Bristol and GAD are 3.5 hours away on a good day and its a place I'd sacrifice a day to go to if you want it done properly.

I unlocked everything on my wifes ML320CDI. Increase in MPG from 29mpg on a run to 36mpg. 21mpg to 27mpg in urban and added an extra 40BHP and a better torque curve. The boys at GAD will give you exactly what youre after because they dont install generic files like most "tuners" do.

I'd say your fault code definitions arent helping you to be honest. They arent codes I recognise as usual fault codes. The MAP barometric pressure could indicate an air leak. My advice is dont delete anything further, let it collect data and then get it on Xentry.

We have had this fault on a car before, however the one we had was a complete non start. There is an invertor controller in the boot which is designed to switch when either the plug in lead is attached and when its switching from hybrid to engine. It sends a starting signal from the controller...

On the end of the camshaft is the variation gears that the chain runs around which is part of the variable timing system. The fault is usually is internally with those gears. If you turn the engine over by hand they will make a loud clacking noise (youll need the rocker cover off to determine...

I dont think the EML will be related to your TPS fault. Seperate systems totally. No such thing as an auto electrician. All good garages with the correct equipment should be able to diagnose all faults competantly. You are absolutely correct to question them. I would seek out an actual...

100% its worth it, especially if you allow GAD tuning to do it. No extra maintenance required.

Usually the variator gears are the problem, the chain is just collateral damage.