Toyota 4A-FE Repair Manual page 29

ENGINE MECHANICAL -
Troubleshooting
(4A-FE) EM-7
ROUGH IDLING
Problem
I
Possible cause
Remedy
Page
'
Rough idle, stalls or Spark plugs faulty Inspect plugs
IG-7
misses
High-tension cords faulty Inspect cords IG-7
Ignition wiring faulty Inspect wiring
Ignition problems
• Ignition coil Inspect coil
I
• Igniter
Inspect igniter
• Distributor ([IA) Inspect llA
Incorrect ignition timing Reset timing EM-20
Incorrect valve clearance Adjust valve clearance EM-16
I
Vacuum leaks
Repair as necessary
• PCV line
• EGR line (w/ EGR system)
• Intake manifold
• Throttle body
· •
Brake booster line
Incorrect idle speed Adjust idle speed
EM-22, 23
EFI system problems
Repair as necessary
EGR valve faulty (w/ EGR system) Check EGR valve
Engine overheats Check cooling system
Low compression
Check compression
EM~38