Toyota 4A-FE Repair Manual page 12

EM-14 ENGINE MECHANICAL - Troubleshooting (4A-GE)
EXCESSIVE FUEL CONSUMPTION
Problem
I
Possible cause
'
Remedy Page
I
-
Poor gasoline mileage Fuel leak
Repair as necessary
Air cleaner clogged Check air cleaner EM-25
Incorrect ignition timing Reset timing
EM-28
EFI system problems Repair as necessary
• Injector faulty
• Deceleration fuel cut system
faulty
Idle speed to high Adjust idle speed EM-30,
31
Spark plug faulty Inspect plugs IG-11, 12
I
EGR system always on (w/ EGR system) Check EGR system
Low compression Check compression EM-38
Tires improperly inflated Inflate tires to proper pressure
Clutch slips
Troubleshoot clutch
Brakes drag Troubleshoot brakes
UNPLEASANT ODOR
Problem Possible cause Remedy Page
Unpleasant odor
i
Incorrect idle speed Adjust idle speed EM-30, 31
Incorrect ignition timing
Reset timing
EM-28
Vacuum leaks Repair as necessary
• PCV line
•
EGR line (w/ EGR system)
•
Intake manifold
•
Throttle body
•
Brake booster line
EFI system problems
i
Repair as necessary