Well, now that my sensors are all good, and no fault codes exist, I am finally driving the car with all its faculties in tact.....which I now find has a flat spot.
Its bang on 2000 rpm, and most noticable when accelerating lightly, its like theres a dead band on the throttle. (AFN TDi) I think its caused by the egr valve letting exhaust gas bypass the turbo, but does anyone know if the egr on the AFN engine is open with atmosphere and closed on vacuum or vice versa? I am trying to figure out its rest position when there is no vac, passing gas or shut?
Since my egr originally had a dud plug connected to it, and the actual egr plug was on the imts (IAT) then the car had no egr control. Since putting the plugs right, the engine is soooooooooo quiet its like a petrol motor now except at idle, and even then its very subdued.
It pulls fine, but there is a noticable jump after 2k which was not there before, its like the first 1/4 to 1/3 of throttle does nothing, but push it down more and theres a sudden rush of acceleration. It used to pull smartly from 1500, now it starts pulling ok there, but goes limp for a second at 2k, then continues pulling again, very very annoying as I use from tickover to 3k max, relying on the low down torque.
I am thinking of disableing the vac line to the egr so it doesnt work but without throwing a code, but does anyone else have any negative aspects of knocking the egr out? I know it needs to be working for the mot or it will likely fail NOx readings, but has anyone else got the same results as me when its connected, and did disconnecting it fix the problem, or am i barking up the wrong tree?