Compression Test How-To
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Tools:
Compression Tester (can get from Autozone ect.) Socket Wrench Socket Extender 10mm socket (for spark plug cover) 13/16 Spark Plug Socket Torque Wrench From the shop manual: COMPRESSION PRESSURE CHECK M1111002600421 1. Before inspection, check that the engine oil, starter and battery are normal. Also, set the vehicle to the following conditions: • Engine coolant temperature: 80 − 95°C (176 − 203°F) • Lights, and all accessories: OFF • Transaxle: Neutral 2. Disconnect the spark plug cables. 3. Remove all of the spark plugs. 4. Disconnect the crankshaft position sensor connector (located next to oil cap, a triangular connector). NOTE: Doing this will prevent the engine control module from carrying out ignition and fuel injection. WARNING Keep your distance from the spark plug hole when cranking. Oil, fuel, etc., may spray out from the spark plug hole and may cause serious injury. 5. Cover the spark plug holes with a shop towel etc. Crank the engine for a few seconds to clear debris from a round the spark plug holes. After the engine has been cranked, check for foreign material adhering to the shop towel. 6. Install the compression gauge to one of the spark plug holes. 7. Crank the engine with the throttle valve fully open and measure the compression pressure. Standard value (at engine speed of 250 r/min): 1,128 kPa (163 psi) Minimum limit (at engine speed of 250 r/min): 951 kPa (138 psi) 8. Measure the compression pressure for all the cylinders, and check that the pressure differences of the cylinders are below the limit. Limit: 98 kPa (14 psi) 9. If there is a cylinder with compression or a compression difference that is outside the limit, pour a small amount of engine oil through the spark plug hole, and repeat the operations in steps 6 to 8. (1) If the compression increases after oil is added, the cause of the malfunction is a worn or damaged piston ring and/or cylinder inner surface. (2) If the compression does not rise after oil is added, the cause is a burnt or defective valve seat, or pressure is leaking from the gasket. 10.Connect the crankshaft position sensor connector. 11.Install the spark plugs (Torque: 18 ft/lb) and spark plug cables. 12.Use the scan tool (or disconnect battery for 1 min) to erase the diagnostic trouble codes. NOTE: This will erase the diagnostic trouble code resulting from the crankshaft position sensor connector being discon- nected. /manual I got 175 on all cylinders, which is high (good). Good luck. {thumbup} |
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