My EGR is stucked closed (the membrane on the actuator is broken) on my 91 300CE (24 V). I isolated the vacuum line that was connected to it to prevent leakage, but I was wondering if I should change the EGR for the moment (thrown so many parts to this car...)?

What to expect from that car running with the EGR stucked closed?

I understand that it should help reducing the Nox if it was working, but any strange behavior to expect from that?

Still troubleshooting an old, old problem here.

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From 300CE to SLK230K