FJ Cruiser 2WD V6-4.0L (1GR-FE) (2008)
Compression Check: Testing and Inspection
INSPECTION
1. INSPECT COMPRESSION
(a) Warm up and stop the engine.
(b) Remove the circuit opening relay See: Computers and Control Systems/Main Relay (Computer/Fuel System)/Testing and Inspection/Circuit
Opening Relay.
(c) Remove the V-bank cover See: Computers and Control Systems/Variable Valve Timing Actuator/Service and Repair/Removal.
(d) Remove the air cleaner assembly See: Fuel Delivery and Air Induction/Throttle Body/Service and Repair/Removal.
(e) Remove the throttle body bracket See: Fuel Delivery and Air Induction/Fuel Injector/Service and Repair/Removal.
(f) Remove the oil baffle plate See: Fuel Delivery and Air Induction/Fuel Injector/Service and Repair/Removal.
(g) Remove the No. 1 surge tank stay See: Fuel Delivery and Air Induction/Fuel Injector/Service and Repair/Removal.
(h) Remove the No. 2 surge tank stay See: Fuel Delivery and Air Induction/Fuel Injector/Service and Repair/Removal.
(i) Remove the ignition coils See: Ignition System/Ignition Coil/Service and Repair/Removal.
(j) Remove the spark plugs.
(k) Inspect the cylinder compression pressure.
(1) Insert a compression gauge into the spark plug hole. (*1)
SST: 09992-00500
(2) Fully open the throttle. (*2)
(3) While cranking the engine, measure the compression pressure. (*3)
Compression pressure:
1,300 kPa (13.3 kgf/cm2, 189 psi)
Minimum pressure:
1,000 kPa (10.2 kgf/cm2, 145 psi)
Difference between cylinders:
100 kPa (1.0 kgf/cm2, 15 psi)
NOTICE:
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Use a fully-charged battery so the engine speed can be increased to 2,500 rpm or more.
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Inspect the other cylinders in the same way.
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Measure the compression in as short a time as possible.
(4) If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat steps (*1)
through (*3) for cylinders with low compression.
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If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.
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If the pressure stays low, a valve may be stuck or seated improperly, or there may be leakage from the gasket.