Intake Manifold

TIGHTENING PROCEDURES
Intake Manifold















- Tighten in numerical order shown in the figure.
1. Tighten all bolts and nuts to 5 to 10 Nm (0.5 to 1.0 kg-m, 3.6 to 7.2 ft. lbs.).
2. Finally tighten all bolts and nuts to 26 to 31 Nm (2.7 to 3.2 kg-m, 20 to 23 ft. lbs.).
- Tighten all bolts and nuts to the final torque, evenly dividing the tightening into at least five steps.

Fuel Tube






- Tighten in numerical order shown in the figure.
1. Tighten all bolts to 9.3 to 10.8 Nm (0.95 to 1.1 kg-m, 6.9 to 8.0 ft. lbs.).
2. Then tighten all bolts to 21 to 26 Nm (2.1 to 2.7 kg-m, 15 to 20 ft. lbs.).

Fuel Pressure Regulator






Tighten fuel pressure regulator to 2.9 to 3.8 Nm (0.3 to 0.39 kg-m, 26.0 to 33.9 inch lbs.).
- Tighten screws evenly several times to have the fuel pressure regulator tightened at the specified torque.
- Always replace O-ring with new ones.
- Lubricate O-ring with new engine oil.

Throttle Body






- Tighten in numerical order shown in the figure.
1. Tighten all bolts to 8.8 to 10.8 Nm (0.9 to 1.1 kg-m, 6.5 to 8.0 ft. lbs.).
2. Then tighten all bolts to 17.7 to 21.6 Nm (1.8 to 2.2 kg-m, 13 to 16 ft. lbs.).

Intake Manifold Collector






Tighten bolts and nuts to 11 to 15 Nm (1.1 to 1.6 kg-m, 8 to 11 ft. lbs.) in numerical order shown in the figure.

Compression Testing

1. Warm up engine.
2. Turn ignition switch OFF.
3. Perform fuel pressure release procedure. Refer to Powertrain Management; Fuel Delivery and Air Induction.






4. Disconnect ignition coil with power transistor harness connectors then remove ignition coils.
5. Remove all spark plugs.
6. Disconnect all injector harness connectors.






7. Attach a compression tester to No. 1 cylinder.
8. Depress accelerator pedal fully to keep throttle valve wide open.
9. Crank engine and record highest gauge indication.






10. Repeat the measurement on each cylinder as shown above.
- Always use a fully-charged battery to obtain specified engine speed.






11. If compression in one or more cylinders is low:
a. Pour a small amount of engine oil into cylinders through spark plug holes.
b. Retest compression.
- If adding oil helps compression, piston rings may be worn or damaged. If so, replace piston rings after checking piston.
- If pressure stays low, a valve may be sticking or seating improperly. Inspect and repair valve and valve seat. If valve or valve seat is dam aged excessively, replace them.
- If compression stays low in two cylinders that are next to each other:
a. The cylinder head gasket may be leaking, or
b. Both cylinders may have valve component damage. Inspect and repair as necessary.