Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Intake manifold lower-part, component overview
1 - Intake manifold lower part
- Removing and installing → Intake manifold lower-part with fuel rail, removing and installing
- After installation, adapt both intake manifold runner position sensors in operating mode "Guided Fault-Finding" in "Adapting intake manifold runner position sensor"
2 - Fuel rail
3 - Fuel Pressure Sensor G247
4 - High-pressure lines
- Before opening high pressure components of the fuel injection system, pressure must be relieved to residual pressure → Procedure that must be performed before opening the high-pressure fuel injection system - Pay close attention! .
- Then wrap a clean rag around the connection and relieve residual pressure by carefully loosening the connection.
- Do not change bend shape
- Tighten high-pressure lines → Figure
5 - 10 Nm
6 - Sleeve
7 - 10 Nm
8 - 2.5 Nm
9 - 10 Nm
10 - Retaining bracket for fuel rail
11 - Vacuum actuator for intake manifold runner control
12 - Vacuum hose
- To Intake Manifold Runner Control (IMRC) Valve N316
13 - 2.5 Nm
14 - Intake Manifold Runner Position Sensor
- Left Intake Manifold Runner Position Sensor 2 G512 , right Intake Manifold Runner Position Sensor G336
15 - 2.5 Nm
16 - Seal
- Replace if damaged
- Lift out with screwdriver to replace
- Press in by hand
17 - Seal
- Replace if damaged
- Lift out with screwdriver to replace
- Press in by hand
18 - Seals
- Replace
19 - Support ring
- Make sure it is seated properly
- The fuel rail wields force via support ring to hold fuel injector tightly in cylinder head.
20 - O-ring
- Replace
- Moisten with clean engine oil
21 - Spacer ring
- Replace if damaged
22 - Radial adjustment
- Replace if damaged
- Clip with support ring - 19 -
23 - Combustion chamber seal
- Replacing → Fuel injectors, removing and installing .
24 - Fuel injector
Removing and installing → Fuel injectors, removing and installing
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.