Toyota 4A-FE Repair Manual page 32

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ENGINE MECHANICAL - Troubleshooting (4A-FE)
POOR GASOLINE MILEAGE
Problem Possible cause Remedy Page
oor gasoline mileage Fuel leak Repair as necessary
Air cleaner clogged
Check air cleaner
Incorrect ignition timing Reset timing EM-20
EFI system problems
Repair as necessary
• Injector faulty
• Deceleration fuel cut system
faulty
Idle speed too high Adjust idle speed EM-22, 23
Spark plugs faulty
Inspect plugs IG-7
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 Incorrect idle speed Adjust idle speed EM-22, 23
Incorrect ignition timing Reset tim ing EM-20
Vacuum leaks Repair as necessary
•
PCV line
•
EGR line (w/ EGR system)
• Intake manifold
•
Throttle body
•
Brake booster line
EFI system problems Repair as necessary