[Tunna_uk]

What was the bill like ?????????

[SiKkBaSs]

Originally Posted by Tunna_uk

What was the bill like ?????????

About £400

Given the amount of work done I consider it a fair price. For a full oil service, replacement of 2 valves and another routine service with upgrade.

[zltm089]

got my car back!!!!.....so excited....the car feels lighter and more powerful....maybe its just in my head....but i think, cleaning up the carbon and new injectors released an extra 20bhp!!!....I'm a human dyno!!!...i swear i can tell how much bhp a car has by just sitting in it!!!....

thanks all....

[SiKkBaSs]

Originally Posted by zltm089

got my car back!!!!.....so excited....the car feels lighter and more powerful....maybe its just in my head....but i think, cleaning up the carbon and new injectors released an extra 20bhp!!!....I'm a human dyno!!!...i swear i can tell how much bhp a car has by just sitting in it!!!....

thanks all....

Good stuff mate. Let the "controlled" madness begin.

[E92Fan]

Originally Posted by zltm089

got my car back!!!!.....so excited....the car feels lighter and more powerful....maybe its just in my head....but i think, cleaning up the carbon and new injectors released an extra 20bhp!!!....I'm a human dyno!!!...i swear i can tell how much bhp a car has by just sitting in it!!!....

thanks all....

Good news

[Tunna_uk]

Originally Posted by SiKkBaSs

About £400

Given the amount of work done I consider it a fair price. For a full oil service, replacement of 2 valves and another routine service with upgrade.

So was it the Valves inside the inlet manifold-or the actual engine valves. sorry if that sounds daft. I am guessing it was the inlet manifold valves ??? Coked up ?

[SiKkBaSs]

Originally Posted by Tunna_uk

So was it the Valves inside the inlet manifold-or the actual engine valves. sorry if that sounds daft. I am guessing it was the inlet manifold valves ??? Coked up ?

Correct. Had developed a random coking of the valves. Happens in a small percentage of N52 engines. Means carbon accumulated in and around them.

[Tunna_uk]

thanks. I am thinking the same fault may be starting in mine. A bit lumpy on idle start up. Comes close to stalling.

[YvesD]

Originally Posted by Tunna_uk

thanks. I am thinking the same fault may be starting in mine. A bit lumpy on idle start up. Comes close to stalling.

You got it.

The beginning of the end....

[zltm089]

Hope this helps others who might have engine warning lights....

Our first diagnosis procedure was to interrogate the fault memories on the
vehicle. The engine management system was storing the fault codes 29EO and
29E1 mixture to lean banks 1 and 2. This lead us to test the induction
system and exhaust systems for integrity, no faults were found with either
component group. The fuel tank ventilation system was then tested for
leaks
and again all was found to be ok.

The fuel pressure was then checked and found minor fluctuations in pressure
resulting in the replacement of the High Pressure Pump. The adaptations
were then cleared and a thorough test carried out at which point the fault
reoccurred storing the same fault codes. The inlet manifold was then
removed to check for Carbon build up which was found to be excessive and
required the engine to be removed to allow a full strip of the cylinder
head
in order to decarbonise each individual inlet valve and port. This
procedure was required in order to ensure the engine was able to breath
correctly and was not masking any other faults, it was not a guaranteed
repair for the fault experienced but one that was considered necessary to
allow correct diagnosis. Part of this procedure included the replacement
of
the Crankcase breather system incorporated in the cam cover.

Upon rebuilding the engine and retesting the fault reoccurred, engine
statuses showed no fluctuations in oxygen sensor voltages or adaptation
values leading us to suspect that an injector or injectors was delivering
an
incorrect volume of fuel. Normally this would be confirmed by swapping
banks of injectors however because the fault was on both banks this was not
an option and as such we deemed it necessary to donor 6 injectors from one
of our demonstration fleet vehicles which confirmed our suspicions and
allowed us to proceed with replacement of 6 new injectors satisfying
warranty guidelines.

Once the injectors had been replaced we again thoroughly tested the vehicle
at which point we were satisfied with the repair.

[Tunna_uk]

that is shocking. Hope mine never needs all that !!!!!!! Holy Cow. That sort of thing should not be required until well over 200,000 miles