Evening all, long time coming this post but ive been working my way through along list of trying to eliminate the lumpy/smoking symptoms you both had at 2000 rpm. Lastly I decided to stump up the cash and get the injectors reconditioned thinking that they were the root cause. After a nightmare getting them out as 2 were seized solid and i had to fabricate a puller, all 4 were found to be well out of Spec and have been refurbished by bosch. Great I thought all fixed, well no unfortunately it still does the same and then I found this thread. I'd already ruled out the boost control solenoid after replacing a vacuum hose and testing the vuccum pump. I can see the turbo actuator arm physically moving in and out in relation to the throttle being depressed whilst stationery but I'm wondering if I overlooked something as this was such a sure fire fix for you both. Do the solenoids act differently under load, had your solenoids packed up completely?
Thanks in advance
Damian
 
The symptoms improved but never went away completely. I find it performs much better on premium fuel or with some additive like Millers power. I haven't had the injectors done but probably should. It's done 115k now.
 
The symptoms improved but never went away completely. I find it performs much better on premium fuel or with some additive like Millers power. I haven't had the injectors done but probably should. It's done 115k now.

Cheers for coming back, it's something I shall have to live with I guess till ird or crank gives up as tired of chasing it now. As far as the injectors go I would leave well alone till you start getting startin issues as it was a bitch getting 2 of mine out and then have to re cut the seats to get a good seal. Mine was starting fine but after doing a leak back test took the plunge as thought it was only thing left that was causing the lumpyness around 2000rpm. It does run on the whole better but not £500 better, i can still feel a stutter if doing 30mph in 4th.
 
Hi I have the same problem iav replaced the injectors upgraded the injector rail and fuel pump but still overfueling did you ever fix this issue thanks
 

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