Isuzu 1999 RODEO Workshop Manual page 513

6A–4 ENGINE MECHANICAL (X22SE 2.2L)
3. Trouble In Fuel System
Condition
Starting motor turns over and spark
occurs but engine does not start
occurs but engine does not start.
4. Engine Lacks Compression
Condition
Engine lacks compression
Engine Compression Test Procedure
1. Start and run the engine until the engine reaches
normal operating temperature.
2. Turn the engine off.
3. Remove all the spark plugs.
4. Remove ignition coil fuse (15A) and disable the
ignition system.
5. Remove the fuel pump relay from the relay and fuse
box.
Possible cause
Fuel tank empty
Water in fuel system
Fuel filter clogged
Fuel pipe clogged
Fuel pump defective
Fuel pump circuit open
Evaporative Emission
System circuit clogged
Multiport Fuel Injection System faulty
Possible cause
Spark plug loosely fitted or spark
plug gasket defective
Valve timing incorrect
Cylinder head gasket defective
Valve incorrectly seated
Valve stem seized
Valve spring weakened
Cylinder or piston rings worn
Piston ring seized
6. Engage the starter and check that the cranking speed
is approximately 300 rpm.
7. Install cylinder compression gauge into spark plug
hole.
8. With the throttle valve opened fully, keep the starter
engaged until the compression gage needle reaches
the maximum level. Note the reading.
9. Repeat the test with each cylinder.
The pressure difference between the individual
cylinders should not exceed 100 kPa (14.5 psi).
Correction
Fill
Clean
Replace filter
Clean or replace
Replace
Correct or replace
Control Correct or replace
Refer to "Electronic Fuel Injection"
section
Correction
Tighten to specified torque or replace
gasket
Adjust
Replace gasket
Lap valve
Replace valve and valve guide
Replace
Overhaul engine
Overhaul engine.