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CONDITION POSSIBLE CAUSES CORRECTION OIL CONSUMPTION OR SPARK 1. PCV system malfunction. 1. Check system and repair as 2. Worn, scuffed or broken rings. 2. Hone cylinder bores. Install new 3. Carbon in oil ring slots. 3. Install new rings. 4. Rings fitted too tightly in grooves. 4. Remove rings and check 5. Worn valve guide(s). 5. Replace cylinder head. 6. Valve stem seal(s) worn or 6. Replace seal(s). CYLINDER COMPRESSION PRESSURE TEST The results of a cylinder compression pressure test can be utilized to diagnose several engine malfunc- Ensure the battery is completely charged and the engine starter motor is in good operating condition. (1) Check engine oil level and add oil if necessary. operating temperature. Select a route free from traf- CAUTION: When removing spark plugs, use Special (3) Remove all spark plugs from engine. As spark plugs are being removed, check electrodes for abnor- (4) Remove the Auto Shutdown (ASD) relay from the PDC. (5) Insert compression gauge adaptor Special Tool 8116 or the equivalent, into the #1 spark plug hole in t. For Special Tool identification, (Refer to 9 - ENGINE - SPECIAL TOOLS). (6) Crank engine until maximum pressure is reached on gauge. Record this pressure as #1 cylin- (7) Repeat the previous step for all remaining cyl- inders. (8) Compression should not be less than 689 kPa (100 psi) and not vary more than 25 percent from cyl- (9) If one or more cylinders have abnormally low compression pressures, repeat the compression test. (10) If the same cylinder or cylinders repeat an abnormally low reading on the second compression Fig. 2 Special Tool 8448 Protective Sleeve 9 - 8 ENGINE 1.6L SOHC PT ENGINE 1.6L SOHC (Continued) |