I have a bit of a problem but til now I have put it down to maybe the inlet or turbo clogged or caked, it still maybe the problem as I still havent cleaned the inlet out as we have arctic conditions at the moment here lol but I will list the symptoms/problems below and it may sound familiar to some of you:
Basically the car seems to pull well up to around 3k rpm but after that it feels restricted, especially on say a motorway, as I say I thought this maybe due to a restriction in the manifold, but another problem is if I rev the car from idle up to a certain point the engine will hesitate, puff a cloud of black smoke out and vibrate, if I remove my foot the engine will normally shudder a bit then regain its composure so to speak, but the other day when I did this, the engine cut out, I tried to restart it and it almost sounded as if it had no compression except on say one cylinder, then the oil pressure light came on (still engine spinning not firing) I started to worry I had done some serious damage at this point, but then after turning for a few more seconds, the light went out and the car started as normal????
It was as if the valves had been stuck open for a few moments resulting in lack of compression hence the cut out and the starting problem....weird?
Does anyone have any ideas, or could it be a result of a carbonned up inlet and over fueling/rich etc or a possible problem with hydraulic lifters over pressurising holding valves open, the car runs fine around town, and only becomes a problem on a run when exceeding 3k rpm ish or when revved a bit too hard when idling.
I will get around to giving it a good service as soon as the weather permits, I have all the filters, oil etc and going to do the EGR delete plus clean the inlet if need be, any help would be great, kind regards Steve
PS: the car has a few minor mods:
Decat, tuning box, cone filter, it looks to have brand new vac lines everywhere, dont know if there should be anything else to look out for????