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Originally Posted by Silver Streek
Depends which engine you have. I've only done it on the M57 and M47 engines. They were pretty easy to take the EGR's off for a good clean. The vacuum controller is more tricky to get at on the M57 as it's under the manifold. I believe on the E9x 320d's it bolted to the side of the block near the EGR and is much easier to change.
I had similar problem with mine, hesitation on light throttle. Swapped with known good EGR and problem still there so I knew it was the vacuum control unit. As it was a pain in the ass to get at and I was having a remap done, I decided to get the EGR function disabled as part of the map. All the hardware is still connected no point in deleting it as long as the EGR does close fully and is not stuck open.
I had a bluefin map and had actually loaded it onto the car before I tried to cure the hesitation issue. After I discovered the cause I phoned superchips and asked them to tweak my map to disable the EGR and downloaded it to my bluefin unit.
Flashed it to the ECU with the hand held unit and hey presto, no more hesitation. Such a nice feeling to get rid of the annoying hesitation.
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I believe it's an N47 it's an e92 320d on an 11 plate, there's a guy near me who specialises in Bmw tuning.. RD motorsport think he has something to do with Celtic tuning.
I'll give him a shout tomorrow and mention this to him. I'll keep u posted. It really is annoying the life out of me to be honest, will it effect the car long term or get worse? It'll probably be next month before I can get to him as I'm completely skint the now
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