BMW E46 Restricted Performance
Discussion
I’ve got a BMW 330ci “E46” and for quite some time now I’ve noticed that it’s performance seems a bit limited.
It’s been to BMW a couple of times and they cannot find fault with it.
She starts up fine and the engine has never missed a beat. She gets through about 1 litre of oil every 1,000 miles which I’ve never had on a car before and which I think is excessive, but I’ve been told by BMW themselves is normal for that type of engine.
The symptoms are as follows:
Once the engine is all up to temperature and you can start to give it the “beans”, when accelerating it seems to “bog down”. There’s a nice burble from the exhaust but it doesn’t really go any faster, however as you start to ease off the accelerator pedal it seems to catch up with itself and the acceleration seems to increase.
I’ve looked at various forums and people with similar restricted performance issues have suggested either a dirty or broken MAF sensor, however they also mention that their restricted performance was accompanied by poor starting / stalling vehicles, however like I’ve said mine runs fine, its only when accelerating that I notice a problem.
I’ve carefully removed the MAF sensor and cleaned it with both electric contact cleaner and carb cleaner but this has made no difference at all!
People have also suggested I unplug the MAF sensor and see if the performance improves, as they say the car will revert back to a factory setting. I’ve tried this and can’t really notice any difference.
BMW have quoted me £340 to change the MAF but as you can appreciate without knowing that it is definitely the problem I’m not keen to do this at the moment.
Any help would be much appreciated.
It’s been to BMW a couple of times and they cannot find fault with it.
She starts up fine and the engine has never missed a beat. She gets through about 1 litre of oil every 1,000 miles which I’ve never had on a car before and which I think is excessive, but I’ve been told by BMW themselves is normal for that type of engine.
The symptoms are as follows:
Once the engine is all up to temperature and you can start to give it the “beans”, when accelerating it seems to “bog down”. There’s a nice burble from the exhaust but it doesn’t really go any faster, however as you start to ease off the accelerator pedal it seems to catch up with itself and the acceleration seems to increase.
I’ve looked at various forums and people with similar restricted performance issues have suggested either a dirty or broken MAF sensor, however they also mention that their restricted performance was accompanied by poor starting / stalling vehicles, however like I’ve said mine runs fine, its only when accelerating that I notice a problem.
I’ve carefully removed the MAF sensor and cleaned it with both electric contact cleaner and carb cleaner but this has made no difference at all!
People have also suggested I unplug the MAF sensor and see if the performance improves, as they say the car will revert back to a factory setting. I’ve tried this and can’t really notice any difference.
BMW have quoted me £340 to change the MAF but as you can appreciate without knowing that it is definitely the problem I’m not keen to do this at the moment.
Any help would be much appreciated.
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