When the HPFP is having failure problems or is dead, what are the symptoms that the driver might face? Or in other words what will the driver experience in order to be certain of it the HPFP's failure?
One common symptom is the rev-o-meter shakes at idle or the engine cuts off soon after start-up. If a scan tool is hooked up during engine start-up, there would be a consistency in the expected and actual fuel pressure.
EDIT: The above scenario only occurs on cold start-ups.
What if there is a lack of this symptom and loss of boost over 3000revs? And this loss of boost is a come and go issue, it might happen for a month and then will go away for a couple of days and then come back again!
You may have either a boost leak somewhere at a coupler, or, most likely a faulty diverter valve. The diaphragm in the stock diverter valve's tear. If you are certain it's a boost issue, that's the first thing I would look at. It's common enough.
Also, are you getting a check engine light in the dash? And have you had a scanner hooked up to the car for codes?
The code P2187 system too lean at idle bank 1.(Too lean at idle= not enough fuel per the amount of air when the engine is idle.) Possible issues MAF, low fuel pressure, vacuum leak engine or failed heated oxygen sensor bank 1. Also could be the High Pressure Fuel Pump is failing
You need to be looking mainly at the HPFP and dirty injectors. Do you have an after market rubber flexible air intake hose? These can intermittently cause that code to be thrown. I would check also the intake tubes and intercooler tubes.
Unless you are mechanically inclined I would take it to a MINI mechanic or the dealership.
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