Cylinder Leakage Test
- Run engine until operating temperature is reached.
- On turbocharged models, disconnect charge air pipe from over cylinder head. Cover opening.
- Remove upper timing belt cover. Remove cover from over ignition coils.
- Mark each ignition coil and remove. Remove spark plugs.
- Set cylinder No. 1 at TDC. Connect leakdown gauge to cylinder No. 1 and pressurize cylinder. If leakdown is excessive, see CYLINDER LEAKAGE DIAGNOSIS table or possible causes. Repair as necessary and go to next step.
- Repeat procedure for every cylinder. Repair as necessary and go to next step when all cylinders are checked.NOTE: It may be necessary to install components and run engine before all cylinders are checked because engine may cool during testing causing variations in test results.
- Install components when check is complete. Tighten spark plugs to 22 ft. lbs. (30 N.m). Tighten ignition coils to 90 INCH lbs. (10 N.m). Install ignition coil cover and camshaft cover and tighten fasteners to 72 INCH lbs. (8 N.m).
- Connect turbo charge air pipe if applicable. Clear fault memory using scan tool. Start engine and check for proper function. Check for any DTCs and repair as necessary.
CYLINDER LEAKAGE DIAGNOSIS
| Leakage location | Related Faulty Component |
|---|---|
| Exhaust Pipe | Faulty Exhaust Valve/Valve Seat |
| Intake Manifold/Throttle Body | Faulty Intake Valve/Valve Seat |
| Dip Stick Hole/Crankcase Ventilation | Faulty Piston Ring/Piston |
| Adjacent Cylinder | Faulty Cylinder Head Gasket |
| Radiator/Expansion Tank | Faulty Cylinder Head, Gasket/Cracked Cylinder Wall |