OEM GMC Envoy Intake Manifold

GMC Envoy Intake Manifold Parts and Q&A

• Intake Manifold
  12580420
  Q: How to replace the intake manifold on a 4.2L engine on GMC Envoy?

  A:

  To change the Intake Manifold to 4.2l engine first the cable off the negative battery and de-pressurise with ch 48027 or without it. Take off the Throttle Body, remove the pcm retaining bolts and nuts before you take off the ecm. Remove the fuel feed pipe from the Fuel Rail and the integral clip from the wire harness bracket, then the engine wire harness bracket bolt. Then pull off the electrical harness and vacuum lines from the Intake Manifold, then disconnect the MAP Sensor electrical connector, crankcase ventilation hose, and vacuum brake booster hose. Take out the generator but make sure not to remove the Intake Manifold bolts as these bolts are trapped in it. Undo and remove Intake Manifold to reveal the rods. For installation, fit in a new Intake Manifold Gasket onto the Intake Manifold, bolt it down tightly to 10 n.m (89 lb in) and reinstall the generator. All the vacuum brake booster hose needs to be attached while getting the inner diameter of the crankcase ventilation hose lubricated before being installed. Connect the MAP Sensor electrical connector, electrical harness, and vacuum lines to the manifold of the intake and secure the engine electrical harness bracket bolt at 10 n.m (89 lb in) attaching the integral clip to the wire harness bracket. Connect the fuel feed pipe to the Fuel Rail and add the pcm mounting studs to the Intake Manifold, then tighten stud to 6 n.m (53 lb in). Mount pcm on studs and fix using retaining bolts and nuts , 8 n.m (71 lb in) tightened. Connect the pcm harness connectors and tighten the retaining bolts to 8 n.m (71 lb in). Lastly, install the Throttle Body, reconnect the negative Battery Cable and check for leaks with the ignition on, engine off for 2 seconds, off for 10 seconds and on and check for fuel leaks.