Workshop Manual

6A–17
ENGINE MECHANICAL (6VE1 3.5L)
Fuel Consumption Excessive
Condition Possible cause Correction
Trouble in fuel system
Mixture too rich or too lean due to
trouble in fuel injection system
Refer to “Abnormal Combustion”
Fuel cut function does not work Refer to “Abnormal Combustion”
Trouble in ignition system Misfiring or abnormal combustion
due to trouble in ignition system
Refer to “Hard Start” or “Abnormal
Combustion”
Others
Engine idle speed too high Reset Idle Air Control Valve
Fuel system leakage Correct or replace
Clutch slipping Correct
Brake drag Correct
Selection of transmission gear
incorrect
Caution operator of incorrect gear
selection
Excessive Exhaust Gas
Recirculation flow due to trouble in
Exhaust Gas Recirculation system
Refer to “Abnormal Combustion”
Lubrication Problems
Condition Possible cause Correction
Oil pressure too low
Wrong oil in use Replace with correct engine oil
Relief valve sticking Replace
Oil pump not operating properly Correct or replace
Oil pump strainer clogged Clean or replace strainer
Oil pump worn Replace
Oil pressure gauge defective Correct or replace
Crankshaft bearing or connecting
rod bearing worn
Replace
Oil contamination
Wrong oil in use Replace with correct engine oil
Oil filter clogged Replace oil filter
Cylinder head gasket damage Replace gasket
Burned gases leaking Replace piston and piston rings or
cylinder body assembly
Oil not reaching valve system Oil passage in cylinder head or
cylinder body clogged
Clean or correct
Engine Oil Pressure Check
1.Check for dirt, gasoline or water in the engine oil.
a. Check the viscosity of the oil.
b. Check the viscosity of the oil.
c. Change the oil if the viscosity is outside the
specified standard.
d. 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.
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:
392–550 kPa (56.9–80.4 psi) at 3000 rpm.
7.Stop the engine.
8.Remove the oil pressure gauge.
9.Install the oil pressure unit.
10.Start the engine and check for leaks.