OEM Cadillac Eldorado Intake Manifold

Cadillac Eldorado Intake Manifold Parts Questions & Experts Answers

• Intake Plenum
  12555840
  Q: How to remove and install the intake manifold on Cadillac Eldorado?

  A: Begin by removing the two sight shield retaining nuts and pulling off the shield from the engine location. Remove coil module connectors from the coil modules located within the camshaft covers and detach the PCV Valve from the camshaft cover and the pcv fresh air tube from the camshaft cover as well as the vacuum tube from both the air solenoid and the fuel regulator vacuum tube. The service process begins with disconnecting connectors from both fuel inlet and return quick-connect fittings at the Fuel Rail and the Fuel Rail bracket retaining nut at the rear lift bracket and the two pushnuts securing the engine coolant heater wire. The generator coolant hose/surge tank pipe should be carefully moved off the Fuel Rail studs before completing the removal of the eight electrical connectors connecting to the eight Fuel Injectors. To detach the Fuel Rail from the Intake Manifold you must remove the four bolts followed by lifting the Fuel Rail and all of its connected injectors off the manifold. Climb under the car to the rear of the Intake Manifold and loosen the plenum duct clamp before removing the ten bolts that fasten the Intake Manifold to the cylinder heads. Afterward you can lift the Intake Manifold by pulling upward on the front end. Check and inspect your Intake Manifold for any damage or wear. Installing this component requires light lubrication of the rubber plenum duct's inner edge followed by debris removal from the Cylinder Head or Intake Manifold so new gaskets can be fitted to the Intake Manifold. Position the Intake Manifold by inserting the rear section into the plenum duct first before guiding down the front towards the cylinder heads. Install the PCV Valve hose securely to the front fitting of the Intake Manifold prior to this step. Begin by attaching ten bolts between the Intake Manifold and cylinder heads starting from the center then move toward 10 nm (89 inch lbs.). The plenum duct must achieve full contact with the Intake Manifold rearsection before performing clamp tightening to 2.25 nm (20 inch lbs.). Tightening forces on the injectors must be avoided to maintain o-ring seals intact so the complete Fuel Rail and injector system needs to be inserted simultaneously into the Intake Manifold. Tighten all four bolts securing the Fuel Rail onto the Intake Manifold to 4 nm (35 inch lbs.). Thoroughly connect all eight electrical connectors to their matching fuel injectors before placing the generator coolant hose/surge tank pipe and engine coolant heater wire onto appropriate Fuel Rail studs. Then fasten both pushnuts using a wrench. Put the Fuel Rail bracket retaining nut on the rear lift bracket before tightening it to 4 nm (35 inch lbs.). Assemble quick connect fittings to the Fuel Rail before you attach vacuum tubes to the air solenoid and fuel regulator vacuum tube and pcv fresh air tube to the camshaft cover and PCV Valve to the camshaft cover and coil module connectors to coil modules within the camshaft covers. The inspection for fuel leaks should begin by turning the ignition switch on for 2 seconds followed by a 10-second off period before a return to the on position. Install the Intake Manifold sight shield onto the engine before tightening the two Intake Manifold sight shield nuts to 3 nm (27 inch lbs.).