Changing your own intake manifold can save you coin in labour costs.
The intake manifold on your 1999 Chevrolet Blazer has two halves. The top half is the upper intake plenum, which routes intake air. The backside half is the lower intake manifold, which houses the fuel distribution meeting. A damaged intake manifold Testament causation a host of issues, including allowing unregulated airflow into the engine, misfiring and leakage.
Instructions
1. Settle on safety goggles.
2. Extract the vehicle's coolant into the drip pan and disconnect the battery.
5. Disconnect the two cables running along the throttle body. The two brackets these cables run through must also be dismounted from the intake plenum and throttle body. Swing the cables and brackets out of the way.
3. Remove the serpentine cestuses by rotating the region tensioner with a 3/8-inch impel ratchet, then working the cestuses handout from the individual pulleys.4. Remove the top of the air filter box and the ducting that connects it to the throttle body.
6. Remove the air conditioning compressor. It has two electrical connectors and four bolts. It is not necessary to disconnect the hoses; position the compressor with the hoses attached out of the way.
7. Loosen the nuts and bolts holding the compressor/power steering bracket in place. A bolt holds the tube from the power steering pump, two bolts and a nut are on the upper portion of the front of the bracket, one bolt is near the power steering pulley and a nut is at the bottom of the bracket. Slide the bracket forward a few inches; it is unnecessary to remove it.
8. Disconnect the wire harness that runs over the top of the intake manifold and move it out of your way.
9. Disconnect all hoses from the manifold with the hose clamp pliers, including the upper coolant hose and exhaust gas recirculation valve hose with bracket in the front; the black hose in the rear routing towards the master cylinder; all heater hoses; and the positive crankcase ventilation valve tube, with the small valve, routing from the driver's side valve cover.
10. Remove the ignition coil, its bracket and the evaporative emissions purge valve behind it.
11. Disconnect the driver's side plug wires from the distributor and label them. Do not disconnect the passenger's side wires. Instead, remove the Torx fasteners holding the distributor cap with a Torx bit then swing the cap with the remaining wires attached out of the way.
12. Mark the location of the distributor rotor in relation to the distributor body with correctional fluid. Remove the bolt holding the distributor in place and lift it from the Blazer.
13. Disconnect the two fuel lines at the rear of the intake inboard of the distributor with a wrench.
14. Separate the upper intake plenum from the lower manifold by taking out the 10 studs holding it. Gently separate the plenum from the base of the fuel assembly. Take all components off of the old plenum and install on the new plenum.
15. Remove the lower manifold by removing the eight bolts holding it in place and lifting it from the vehicle. The intake gaskets will likely need replacement.
16. Install the new lower intake manifold. The 1999 Blazer lower manifold bolts need to be torqued three times. Torque them to 22 inch-pounds, 106 inch-pounds and finally 26 foot-pounds.
17.Reinstall the removed components in the reverse order of removal. Be sure to seat the fuel lines fully, align the distributor marks correctly, replace any worn gaskets or O-rings, refill the coolant with Dex-Cool and reconnect the battery.
