Engine: Testing and Inspection
ENGINEINSPECTION
1. INSPECT IGNITION TIMING
(a) Warm up the engine and stop the engine.
(b) Check the ignition timing.
(1) Connect the intelligent tester to the DLC3.
(2) Enter DATA LIST MODE on the intelligent tester.
HINT: Please refer to the intelligent tester operator's manual for further details.
(3) Start and idle the engine.
Ignition timing: 8 to 12° BTDC @ idle (Shift lever on N)
(4) Disconnect the intelligent tester from the DLC3.
2. INSPECT ENGINE IDLE SPEED
(a) Warm up the engine.
(b) Check the idle speed.
(1) Connect the intelligent tester to the DLC3.
(2) Enter DATA LIST MODE on the intelligent tester.
Idle speed: 700 to 800 rpm
NOTICE:
^ When checking the idle speed, make sure the shift lever is on N.
^ Check the idle speed with the cooling fan off.
^ Switch off all accessories and the A/C before connecting the intelligent tester.
3. INSPECT COMPRESSION
(a) Remove the V-bank cover.
(b) Remove the air cleaner inlet and intake air pipe.
(c) Disconnect the throttle control motor connector.
(d) Remove the oil level gauge guide.
(e) Remove the 8 ignition coils.
(f) Remove the 8 spark plugs.
(g) Disconnect the 8 injector connectors.
(h) Check the cylinder compression pressure.
(1) Insert a compression gauge into the spark plug hole.
(2) Fully open the throttle.
(3) While cranking the engine, measure the compression pressure.
Compression pressure: 1,226 kPa (12.5 kgf/cm2, 178 psi) or more
Minimum pressure: 981 kPa (10.0 kgf/cm2, 142 psi)
Difference between each cylinder: 98 kPa (1.0 kgf/cm2, 14 psi)
NOTICE:
^ Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
^ Check the other cylinder's compression pressure in the same way.
^ This measurement must be done as quickly as possible.
If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect again.
HINT: If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.
If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage in the gasket.
(i) Connect the 8 injector connectors.
(j) Install the 8 spark plugs.
(k) Install the 8 ignition coils.
(l) Install the oil level gauge guide.
(m) Connect the throttle control motor connector.
(n) Install the air cleaner inlet and intake air pipe.
(o) Install the V-bank cover.
4. INSPECT CO/HC
(a) Start the engine.
(b) Rev the engine at 2,500 rpm for approximately 180 seconds.
(c) Insert CO/HC meter testing probe at least 40 cm (1.3 ft) into the tailpipe during idling.
(d) Check CO/HC concentration at idle and/or 2,500 rpm.
HINT:
^ Complete the measurement within 3 minutes.
^ Check regulations in your area when performing 2 mode CO/HC concentration testing (engine check at both idle speed and at 2,500 rpm).
(e) If the CO/HC concentration does not comply with regulations, perform troubleshooting in the order given below.
(1) Check heated oxygen sensor operation.
(2) See the table below for possible causes, and then inspect and repair.
