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Pelican Technical Article:

M54 Engine Secondary Air Components Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$250

Talent:

***

Tools:

Sockets 13 10 mm, flathead screwdriver, plastic gasket scraper

Applicable Models:

X3 E83 (2004-06)
X3 E83 facelift (N/A-A)

Parts Required:

Secondary air pump, air valve and gasket, air hose

Hot Tip:

Replace any cracked or dry rotted hoses

Performance Gain:

Working secondary air

Complementary Modification:

Replace engine air filter

An electric air pump (red arrow) forces fresh air into the exhaust stream just before the exhaust enters the exhaust manifold (blue arrow).
Figure 1

An electric air pump (red arrow) forces fresh air into the exhaust stream just before the exhaust enters the exhaust manifold (blue arrow). On early X3 models, a flow meter (yellow arrow) is used on the inlet of the pump to confirm pump operation.

Working at the top of the flow meter, disconnect electrical connector by squeezing tabs (red arrows) and pulling is straight off.
Figure 2

Working at the top of the flow meter, disconnect electrical connector by squeezing tabs (red arrows) and pulling is straight off.

Next you have to disconnect the flow meter from the pump.
Figure 3

Next you have to disconnect the flow meter from the pump. Squeeze the collar (red arrows), and then pull the pipe straight off the secondary air pump to remove.

Now it is time to pull the meter with the hose off the pump bracket.
Figure 4

Now it is time to pull the meter with the hose off the pump bracket. Slide it toward the firewall and remove. If the rubber bushing (red arrows) doesn't come off with the meter, pull it off and reinstall into the meter (blue arrow). To remove the filer from the sensor, remove the T20 Torx screw (yellow arrow), then remove the filter, replace if necessary. Next, cut the hose clamps and transfer the hose over to the new sensor.

Next you have to disconnect the secondary air pipe from the pump to valve connection (yellow arrow).
Figure 5

Next you have to disconnect the secondary air pipe from the pump to valve connection (yellow arrow). Once the hose is removed and the pump can be lifted, disconnect the electrical connector (red arrow) See following steps.

Squeeze the collar (red arrows), and then pull the pipe straight off the secondary air pump and air pump check valve to remove.
Figure 6

Squeeze the collar (red arrows), and then pull the pipe straight off the secondary air pump and air pump check valve to remove. The valve connection (blue arrow) may be corroded. If so, wiggle the hose back and forth as you pull it off. A small amount of penetrating oil may also help free it up.

Now it is time to unbolt the secondary air pump.
Figure 7

Now it is time to unbolt the secondary air pump. Start by removing the two 13mm fasteners (red arrows) that secure the pump to the mounting bracket. Working at the bottom of the pump, disconnect electrical connector (inset) by squeezing tabs and pulling is straight off.

Lift the pump up with the mounting bracket to remove (blue arrow).
Figure 8

Lift the pump up with the mounting bracket to remove (blue arrow). Place the pump on a workbench, remove the three 10 mm nuts (red arrows), then remove the mounting bracket from the pump. Transfer the rubber mounted over to the new pump. Pull them straight off to remove. Reverse steps to install new pump.

To replace the check valve, remove the two 10mm nuts (red arrows) from the bottom of the check valve.
Figure 9

To replace the check valve, remove the two 10mm nuts (red arrows) from the bottom of the check valve. I find it is easiest to do this using a ratchet with a 10mm universal adapter. You can now remove the check valve from the cylinder head. Once removed clean the sealing surface of the valve, be sure to remove the old gasket (blue arrow). Install new secondary air valve with new gasket and tighten fasteners. Then install the secondary air pipe. Check operation of secondary air components and clear DME fault codes using a BMW scan tool.

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Page last updated: Wed 12/7/2016 03:08:52 AM