I am not sure if pm reply reached you so I post it here, Try this one.
If you cleaned your EGR valve and Inlet manifold, if the car struggles to accelerate from low rpms, if you have that DPI filter( or what ever that name was) You can fix that sluggishness by driving on motorway.
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Before you do the fallowing, check that the oil and engine coolant level are within the recomended limits!!!!!!!!
Shift in 4th and drive about 2 miles around 4000rpms... I did this just today, around 3500 rpms I was doing close to 76mph. After those two miles shift it to 5th and do a normal driving for few miles. When you reach your destination
let the car idle for at least not less than 2-3 minutes. Turbo, exhaust pipe and some other parts will get really hot during those 2 miles at 4000rpms. So it is essential that you let the engine cool down before you switch of the engine.
Reason for doing this is that at those high rpms and temperatures oil residue, soot or other particles will just burn away leaving exhaust pipe and that filer that picks up and cleans exhaust fumes clean. This should even burn or melt any soot off from cylinder heads and some oil residue from valves as well. Some or most of you have probably seen how my cylinder head looked like after I removed that.. soot everywhere, it even blocked one of the injector nozzles.
Oh yeah, and after that fast drive when you leave you car idling for those few minutes, open up the bonnet and just in case look for any oil leaks
This should cure sluggishness eventually.
If some one try this, then let us know how it went.
This worked for me.
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Although, you may not reach 4000rpm's but this should clean piston heads. valves and other stuff.. soot should just burn away... Check for any oil leaks and check oil and coolant level before you do that