Isuzu 1999 RODEO Workshop Manual page 523

6A–14 ENGINE MECHANICAL (X22SE 2.2L)
Fuel Consumption Excessive
Condition
Trouble in fuel system
Trouble in ignition system
Others
Oil Problems
Condition
Oil pressure too low
Oil contamination
Oil not reaching valve system
Engine Oil Pressure Check
1. Check for dirt, gasoline or water in the engine oil.
a. Check the viscosity of the oil.
b. Change the oil if the viscosity is outside the
specified standard.
c. Refer to the "Maintenance and Lubrication" section
of this manual.
2. Check the engine oil level.
The level should fall somewhere between the "ADD"
and the "FULL" marks on the oil level dipstick.
If the oil level does not reach the "ADD" mark on the
oil level dipstick, engine oil must be added.
Possible cause
Mixture too rich or too lean due to
trouble in fuel injection system
Fuel cut function does not act
Misfiring or abnormal combustion
due to trouble in ignition system
Engine idle speed too high
Returning of accelerator control
sluggish
Fuel system leakage
Clutch slipping
Brake drag
Selection of transmission
incorrect
Excessive Exhaust
Recirculation flow due to trouble in
Exhaust Gas Recirculation system
Possible cause
Wrong oil in use
Relief valve sticking
Oil pump not operating properly
Oil pump strainer clogged
Oil pump worn
Oil pressure gauge defective
Crankshaft bearing or connecting
rod bearing worn
Wrong oil in use
Oil filter clogged
Cylinder head gasket damage
Burned gases leaking
Oil passage in cylinder head or
cylinder body clogged
3. Remove the oil pressure unit.
4. Install an oil pressure gauge.
5. Start the engine and allow the engine to reach normal
operating temperature (About 80°C).
6. Measure the oil pressure.
Oil pressure should be:
150 kPa (21.8 psi) at idle speed.
7. Stop the engine.
8. Remove the oil pressure gauge.
9. Install the oil pressure unit.
10. Start the engine and check for leaks.
Correction
Refer to "Abnormal Combustion"
Refer to "Abnormal Combustion"
Refer to Hard Start or Abnormal
Combustion Troubleshooting Guide
Reset Idle Air Control Valve
Correct
Correct or replace
Correct
Correct
gear Caution operator of incorrect gear
selection
Gas Refer to Abnormal Combustion
Correction
Replace with correct engine oil
Replace
Correct or replace
Clean or replace strainer
Replace
Correct or replace
Replace
Replace with new engine oil
Replace oil filter
Replace gasket
Replace piston and piston rings or
rebore cylinders
Clean or correct