Hi eems, I'd be interested to know if the car has still been running fine with the EGR valve blanked off. Also did you just do this physically or had the EGR programmatically turn off in the ECU? or both?eems wrote:Just to follow up on this thread, i've had the EGR valve blanked off since February and the engine has not made a single shudder in that time.
It's %100 EGR system *related*. Right after blanking the unit, the engine still shuddered in an identical fashion. But, with after an ECU reset, the problem hasn't reappeared.
It's possible a learned function gets disrupted because of the EGR's operation. Just looking at it logically suggests the EGR valve operating causes the ECU to learn parameters which lead to outputs that cause the engine to shudder.
In summary, the car had a shudder problem for 14 months until the EGR was blanked off and the ECU reset. It has been working well for 9 months. DPF still re-generates and the car drives fine. Economy is better.
The engine check light does come on every 1000-1500kms with an intake temp error, which is common when EGR's are deleted. Looking into an electronic fix when i get some time.
Cheers