OEM Cadillac DeVille Intake Manifold

Cadillac DeVille Intake Manifold Parts Questions & Experts Answers

• Intake Plenum
  12555840
  Q: How to replace the intake manifold on Cadillac DeVille?

  A: Replacing the Intake Manifold; take off the 2 nuts of the Intake Manifold sight shield and remove sight shield from engine. Remove coil module connectors from coil modules in the camshaft covers, pcv dirty air tube, pcv fresh air tube, fuel regulator vacuum tube, and vacuum tubes from air solenoid. Then unplug the fuel inlet and return quick-connect couplings at the Fuel Rail, remove the Fuel Rail bracket retaining nut at the rear lift bracket and remove the 2 pushnuts attached to the engine coolant heater wire if so equipped, putting it out of the way. Remove the eight electrical connectors from the eight Fuel Injectors by carefully sliding the surge tank pipe away from the Fuel Rail studs. Now remove the four bolts that hold the Fuel Rail to the Intake Manifold. Remove the whole Fuel Rail and injector assembly from the Intake Manifold, loosen the plenum duct clamp located at the rear end of the Intake Manifold, peel off 10 bolting used in fastening the Intake Manifold to the cylinder heads. Lift up the Intake Manifold from the front with an upward movement, and clean and inspect it. For installation, lubricate lightly inside edge of rubber plenum duct, clean the Cylinder Head or Intake Manifold before installation onto new gaskets off the Intake Manifold. Make sure that the PCV Valve Hose is securely connected to the fitting of the front Intake Manifold before installing it. Put the rear of the Intake Manifold into the plenum duct, and position the front on top of the cylinder heads, subsequently loosely fixing the Intake Manifold to the cylinder heads using the 10 bolts, tightening them in sequence to 10 nm. Make sure the plenum duct is secured completely on the back of Intake Manifold; tighten the plenum duct clamp to 2.25nm. Lubricate intake manhattan Fuel Injector bores with light mineral oil gm p/n 9981704 engine oil, clean engine oil or equivalent. Install entire Fuel Rail and injector assembly into the Intake Manifold without being forced into the injectors. Put on the 4 bolts that fasten the Fuel Rail to the Intake Manifold and secure them using 10 nm. Connect the 8 electrical connectors to the fuel injectors; connect the surge tank pipe to the Fuel Rail studs; connect the engine coolant heater wire to the Fuel Rail studs if so equipped. Fit and tighten the 2 pushnuts, fuel rail bracket retaining nut to the rear lift bracket and tighten to 10 nm. Mount the quick connect fittings onto the Fuel Rail, vapor lines to air solenoid, fuel regulator vacuum tube, pcv fresh air tube, pcv dirty air tube, coil module connectors to the coil modules in the camshaft cases. To check for fuel leaks, activate ignition by turning it to on for 2 seconds, off for 10 seconds, and on. Lastly, set up your Intake Manifold sight shield to the engine and thread in the 2 sight shield nuts to 3 nm.