Changing glow plugs on BMW 3 Series e91

Start by disconnecting the negative terminal of your battery

Unscrew the 6 screws then remove the filter.

Unscrew the 4 screws on the engine cover then remove it.

The AUC sensor must be extracted by rotating it 1/4 turn (green square).

Then remove the cable (yellow line) by pulling on it, it is fixed by 3 staples (blue square).

We now unscrew the 2 screws (circled in red) which hold the apron.

Remove the apron by pulling on it.

The seal is removed.

Remove the cover of the upper screw. You need an E18 torx socket for the screw.

Remove the other 2 torx screws. You need an E16 torx socket.

The 2 anti-rapprochement bars can be removed by pulling on them.

We start by removing the screed by unscrewing the 3 screws then we remove it.

The acoustic cover is removed by unscrewing the 2 screws and then removing it.

Disconnect the pressure sensor.

Now you need to remove the pressure converter from the intake manifold. The pressure converter (circled in purple) is attached to the manifold clip (in red). Simply push the small mounting tab (in blue).

A small vacuum hose is connected to the pressure converter AND the manifold, so it must be extracted at the converter (in yellow).

The vacuum hose is removed.

We disconnect the connection box.

The staple is removed from the electrical sheath.

Remove the clip holding the hose and then remove the hose. In the photo, the hose is already unclipped.

Unscrew the 12 screws with a 10 socket.

Unscrew the 7 nuts with an 11 socket.

The collector is removed.

There is one per candle, you have to press on each side of the head of the beam then pull upwards to remove it from the candle.

Then unscrew each spark plug with a long 10mm socket.