Engine: Testing and Inspection
ENGINEINSPECTION
1. INSPECT ENGINE COOLANT
2. INSPECT ENGINE OIL
3. INSPECT BATTERY
4. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
5. INSPECT SPARK PLUG
6. INSPECT FAN AND GENERATOR V BELT
HINT: Use of the automatic tensioner has made tension and flexibility measurements unnecessary.
a. Check that the indicator mark on the automatic tensioner is within range A as shown in the illustration.
b. When the mark is out of the standard range, replace the V belt with a new one.
HINT:
^ After installing the V belt, check that it fits properly in the ribbed grooves. Check with your hand to confirm that the belt has not slipped out of the groove on the bottom of the crank pulley.
^ A "new belt" is a belt which has been used for less than 5 minutes on a running engine.
^ A "used belt" is a belt which has been used on a running engine for 5 minutes or more.
^ After installing a new belt, run the engine for approximately 5 minutes and then recheck the tension.
7. INSPECT IGNITION TIMING
a. Warm up the engine.
b. Check the ignition timing.
1. Connect the hand-held tester (with CAN VIM) to the DLC3.
2. Enter DATA LIST MODE on the hand-held tester.
Ignition timing 8 to 12° BTDC @ idle
HINT: Please refer to the hand-held tester operator's manual for help on selecting the DATA LIST
8. INSPECT ENGINE IDLE SPEED
a. Warm up the engine.
b. Check the idle speed.
1. Connect the hand-held tester (with CAN VIM) to the DLC3.
2. Enter DATA LIST MODE on the hand-held tester.
Idle speed: 700 to 800 rpm
NOTICE:
- When checking the idle speed, the transmission should be in the neutral position.
- Check the idle speed with the cooling fan off.
- Switch off all accessories and A/C before connecting the hand-held tester.
HINT: Please refer to the hand-held tester operator's manual for further details.
9. 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 spark plugs.
g. Disconnect the 8 injector connectors.
h. Check the cylinder compression pressure.
SST 09992-00500
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: 1.2 MPa (12.5 kgf/cm2, 178 psi)
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 engine speed of 250 rpm or more.
- Check other cylinder's compression pressure in the same way.
- This measurement must be done as quickly 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 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 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.
10. 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 measuring within 3 minutes.
^ Check regulations and restrictions 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, troubleshoot in the order given.
1. Check heated oxygen sensor operation.
2. See the table on the next page for possible causes, and then inspect and repair.