The first step for servicing or repairing the intake manifold involves cooling system fluid drain and removing the Air Cleaner outlet pipe. The maintenance process for the Intake manifold starts by removing both
Throttle Body (TB) shield bolts before disconnecting the acceleration control cable together with any speed control cable running to the intake manifold and TB. The service includes removing power connections from the Throttle Position (TP) sensor and Manifold Absolute Pressure (MAP) sensor and Idle Air Control (IAC) valve. Separately detach the engine vacuum harness and brake booster hose along with the vapor purge tube quick connect coupling and the crankcase breather hose and two coolant hoses. The two engine wiring harness pin-type retainers and the pin-type retainer located at the back of the intake manifold must be removed. Dispose of the EGR tube support bracket bolt together with the two bolts which secure the EGR tube flange. The bracket loses its fuel supply tube and electrical connectors as well as EVAP tube quick connect coupling gets disconnected. Remove the retainer from the
Knock Sensor (KS) electrical connector followed by the manufacture's wiring harness pushpin from the bottom of the intake manifold and disconnect the fuel supply tube spring lock coupling. Use a plastic scraper to clean the sealing surfaces while removing previous sealant following the removal of five bolts and the intake manifold. Avoid using metal scrapers which would damage the surfaces. Securely clean the cylinder head sealing surface by applying silicone gasket remover followed by metal surface preparation treatment according to safety protocol. The replacement procedure starts with discarding the four intake manifold gaskets while inspecting the intake manifold for metal debris before a necessary replacement. The installation process involves using new gaskets for the intake manifold and then placing the manifold in position before tightening five bolts to 18 Nm (159 lb-in). Connect the wiring pushpin with KS connector retainer, electrical connectors and secure the fuel supply tube and EVAP tube quick connect coupling. Secure the two EGR flange mounting bolts and EGR tube support bracket bolt by tightening them to 18 Nm (159 lb-in). Proceed with reconnecting the engine vacuum harness alongside the brake booster hose and crankcase breather hose and two coolant hoses after positioning the engine wiring harness and connecting its two pin-type retainers. Reconnect the fuel supply tube spring lock coupling before attaching the
MAP Sensor and TP sensor electrical connectors. The IAC valve electrical connector also needs reconnection. Affix the acceleration control cable to both the intake manifold and the TB while connecting the speed control cable in case of equipment presence. The last step includes attaching the TB shield and using torque up to 8 Nm (71 lb-in) for the two bolts before reinstalling the ACL outlet tube and completing the engine cooling system bleeding process.