E46 320d - hesitation (Views)

[wrightp]

Hi there

I have owned my 320d M Sport for over 3 years now (A 53 plate and I am second owner), and have noticed a recent hesitation when accelerating. It seems to hold back a little between 3 and 3.5 k revs.
I have read up on forums about this and have considered a new MAF meter, and checked pipes under the engine cover for splitting. The car has a full BMW service history.
I have taken the car to two BMW independents who have confirmed that the fault code says "MAF sensor" so I have changed that for a second hand (Known to be good) unit without any change to the hesitation.

One of the indies has said that he believes that the symptoms are telling him that the valves are coked up and the engine is restricted in the amount of air that the valves can pass into the chambers. This apparently will explain why the MAF fault is showing as the car believes it has more air than actual and more than the MAF meter is recording.

The cost to sort this out is not cheap and the head is to come off. The car has done 77000 miles and is one of the first Euro 4 emission cars.

My question is :- Can anyone help me think if this conclusion is logical/ likely as I have never run a car with coked up valves (Not the slowest of drivers), but the 320d Euro 4 emissions recirculation system is new to me?

I would welcome some guidance please?

Thanks
Phil.

[Ranger 6]

Have a look on www.bmwland.co.uk there may be people with similar symptoms/experiences.

[The_Doc]

jz325i said:

I would start by cleaning and overhauling the injectors. Should be cheap - 10's of £. Not 100's.

but a new injector is £250 each, so if it can't be revitalised....

count yourself lucky you only have 4, I have 6