Engine: Testing and Inspection
ENGINEON-VEHICLE INSPECTION
1. CHECK IGNITION TIMING
a. When using the intelligent tester:
1 Connect the intelligent tester to the DLC3.
HINT: Refer to the intelligent tester operator's manual for further details.
Standard ignition timing: 5 to 15° BTDC @ idle (Shift lever on N)
2 Disconnect the intelligent tester from the DLC3.
b. When not using the intelligent tester:
1 Remove the V-bank cover.
2 Connect the tester probe of a timing light to the wire of the ignition coil connector for the No. 1 cylinder.
3 Using SST, connect the tachometer probe to terminal TAC of the DLC3.
SST 09843-18030
4 Using SST, connect terminals TC and CG of the DLC3.
SST 09843-18040
5 Using the timing light, check the ignition timing.
Standard ignition timing: 5 to 15° BTDC @ idle (Shift lever on N)
6 Remove the SST from the DLC3.
7 Disconnect the timing light from the engine.
8 Install the V-bank cover.
2. CHECK ENGINE IDLE SPEED
a. When using the intelligent tester:
1 Connect the intelligent tester to the DLC3.
HINT: Refer to the intelligent tester operator's manual for further details.
2 Maintain the engine at 2,500 rpm for approximately 90 seconds.
3 Check the idle speed.
Standard idle speed: 700 ± 50 rpm
If the idle speed is not as specified, check the air intake system.
4 Disconnect the intelligent tester from the DLC3.
b. When not using the intelligent tester:
1 Using SST, connect the tachometer probe to terminal TAC of the DLC3.
SST 09843-18030
HINT: Refer to the intelligent tester operator's manual for further details.
2 Maintain the engine at 2,500 rpm for approximately 90 seconds.
3 Check the idle speed.
Standard idle speed: 700 ± 50 rpm
4 Remove the SST from the DLC3.
5 Disconnect the tachometer from the DLC3.
3. CHECK COMPRESSION
a. Remove the V-bank cover.
b. Remove the air cleaner hose assembly.
c. Disconnect the throttle position sensor and control motor connector.
d. Remove the oil dipstick 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.
NOTICE: Check each cylinder's compression pressure in the same way.
1 Insert a compression gauge into the spark plug hole.
2 Fully open the throttle.
3 While cranking the engine, measure the compression pressure.
Standard compression pressure: 1,373 kPa (14.0 kgf/cm2, 199 psi) or more
Minimum pressure: 1,030 kPa (10.5 kgf/cm2, 149 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.
^ 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 dipstick guide.
m. Connect the throttle position sensor and control motor connector.
n. Install the air cleaner hose assembly.
o. Install the V-bank cover.
4. CHECK CO/HC
HINT: This check is used only to determine whether or not the idle CO/HC complies with regulations.
a. Start the engine.
b. Maintain the engine at 2,500 rpm for approximately 180 seconds.
c. Insert a 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.
1 Check the heated oxygen sensor operation.
2 Refer to table for possible causes, and then inspect and repair.