WARNING - ROLLS ROYCE PHANTOM OWNERS
Discussion
POTENTIAL FOR RANDOM MISFIRE MULTIPLE CYLINDERS AND ROUGH IDLE
REPLACE THE PCVs (PRESSURE CONTROL VALVES) ON YOUR PHANTOM EVERY FEW YEARS.
This is a spring loaded valve that controls crankcase pressure and vents gases back in to the air intake. It should be regularly checked and replaced. When it fails which it will, then it allows oil vapor into your air intake, gumming up the air ways, intake valves, engine, injectors and spark plugs, giving you multiple random misfires and engine missfire faults.
Rolls Royce do not see this as a service item, do not check it and do not replace it.
BMW/RR Part Numbers: 11157563505 and 11157563506
These items will fail or age as well as mileage so low mileage cars are just as likely to be effected and could be worse off as they are not doing the miles to burn off the deposits.
Left unchecked and not replaced you could easily end up with a heads off decoke, but if its really bad then would suggest 'Walnut shell' cleaning of the intake system and lots of engine flush treatments first.
Dealers will recommend replacing injectors but as its a direct injector engine the spark and injectors should be the last thing to be effected. Injector cleaning might solve the problem but as the injectors are not in the air intake chamber as they would be on most other cars, you may still have blocked intakes.
More likely you will start to get misfire as the engine fails to give the correct air to fuel mix or you will get low compression form the valvetronic variable valve timing failing to shut valves as needed.
The PCVs are a black plastic disc on the side of the plenum air intake chamber just where it says ROLLS ROYCE on the engine, three torx bolts and a push on rubber breather tube, which is worth cleaning out whilst you have it removed. Very easy to do 10mins each side max.
If your PCV has failed then when you remove it, it will be covered in oil and there maybe oil residue in the bottom of your plenum chamber, there may also be gunge in the oil tube going to the PCV. With the air intake pipes removed you can see the PCV from inside the throttle body butterfly valve on the opposite sides of the plenum.
HOPE THIS HELPS OTHERS - IMPORTANT PREVENTATIVE MAINTENANCE
REPLACE THE PCVs (PRESSURE CONTROL VALVES) ON YOUR PHANTOM EVERY FEW YEARS.
This is a spring loaded valve that controls crankcase pressure and vents gases back in to the air intake. It should be regularly checked and replaced. When it fails which it will, then it allows oil vapor into your air intake, gumming up the air ways, intake valves, engine, injectors and spark plugs, giving you multiple random misfires and engine missfire faults.
Rolls Royce do not see this as a service item, do not check it and do not replace it.
BMW/RR Part Numbers: 11157563505 and 11157563506
These items will fail or age as well as mileage so low mileage cars are just as likely to be effected and could be worse off as they are not doing the miles to burn off the deposits.
Left unchecked and not replaced you could easily end up with a heads off decoke, but if its really bad then would suggest 'Walnut shell' cleaning of the intake system and lots of engine flush treatments first.
Dealers will recommend replacing injectors but as its a direct injector engine the spark and injectors should be the last thing to be effected. Injector cleaning might solve the problem but as the injectors are not in the air intake chamber as they would be on most other cars, you may still have blocked intakes.
More likely you will start to get misfire as the engine fails to give the correct air to fuel mix or you will get low compression form the valvetronic variable valve timing failing to shut valves as needed.
The PCVs are a black plastic disc on the side of the plenum air intake chamber just where it says ROLLS ROYCE on the engine, three torx bolts and a push on rubber breather tube, which is worth cleaning out whilst you have it removed. Very easy to do 10mins each side max.
If your PCV has failed then when you remove it, it will be covered in oil and there maybe oil residue in the bottom of your plenum chamber, there may also be gunge in the oil tube going to the PCV. With the air intake pipes removed you can see the PCV from inside the throttle body butterfly valve on the opposite sides of the plenum.
HOPE THIS HELPS OTHERS - IMPORTANT PREVENTATIVE MAINTENANCE
Hi Guys just wandered in sorry, but unfortunately every FSI ( fuel stratified injection) engine ever built will suffer from inlet coking to some degree from mild to unbelievable until the day they all get scrapped. It's a bad design simple as, and will become an epidemic soon and will indeed become the saviour of many garages and indies
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