Toyota 4A-FE Repair Manual page 30

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ENGINE MECHANICAL - Troubleshooting (4A-FE)
ENGINE HESITATES/POOR ACCELERATION
Problem Possible cause
Remedy Page
Engine hesitates/
Spark plugs
fautty Inspect plugs IG-7
poor acceleration
High-tension cords faulty Inspect cords
IG-7
Vacuum leaks
Repair as necessary
• PCV line
• EGR line {w/ EGR system)
• Intake manifold
• Throttle body
• Brake booster line
Incorrect ignition timing Reset timing EM-20
Incorrect valve clearance Adjust valve clearance
EM-16
Fuel system clogged Check fuel system
Air cleaner clogged
Check air cleaner EM-15
EFI system problems Repair as necessary
Engine overheats Check cooling system C0-4
Low compression
Check compression EM-38
ENGINE DIESELING
Problem Possible cause Remedy Page
Engine dieseling EFI system problems Repair as necessary
(runs after ignition
Incorrect ignition timing
Reset timing EM-20
switch is turned off)
I
EGR system faulty (w/EG R system) Check EGR system