Hello,


struggling with this vehicle currently. Car has problem with hesitation, jerking and throttling.
Car had these symptoms and egr was removed. Everything okay for a few months and now problems are back.
No codes and all sensor values looking okay.


Egr is mechanically blanked. Throttle valve disconnected, no effect. Actually I tried this without maf, lambda, boost sensor, intake pipe open,
all to no effect.


Occasionally problem go away, usually when very warm. Idle is not very smooth when problem is on.


Troublesome area is pretty much on 2250rpm. On standstill no problem to keep this rpm steady.
When driving around this rpm spot, car can slightly decelerate or accelerate or jerk very hard. Sometimes seem to bog down and few seconds later will throttle itself to even higher rpm. When bogging and clutch applied, rpmīs wander from idle to 1500rpm in a steady rhythm multiple times.


On data list can be seen Requested IQ and Current IQ.
Requested IQ can be seen jumping to another level with steady accelator input.
When car is throttling itself, current IQ is dropping to almost zero. And when bogging, IQ goes upwards.


So engine is accelerating when IQ is dropping. Sounds like mechanical issue with injectors. No unusual ignition sounds.
Not running on oil either.


Earth wiring redone. Loom checked between engine - ecu and ecu - chassis. No problems.


What the hell could this be? What could be alternating the IQ?