Troubleshooting - Toyota Supra 1990 Manual

IGNITION SYSTEM - Troubleshooting IG-3
TROUBLESHOOTING
Problem
Possible causes Remedy Page
Engine wi II not start! Incorrect ignition timing
Reset timing IG-20
hard to start
Ignition problems
(cranks OK)
•
Ignition coil Inspect coil IG-90r12
•
(7M-GTE)
Igniter
Inspect igniter
IG-15
•
(7M-GE)
D istri butor
Inspect distributor
IG-9
(7M-GTE)
Cam position sensor I nspect cam position sensor IG-16
•
High-tension cords Inspect high-tension cords IG-60r11
Ignition wiring disconnected
I nspect wiring
or broken
Rough idle or stalls Spark plugs faulty
Inspect plugs IG-7
Ignition wiring faulty Inspect wiring
Incorrect ignition timing Reset timing IG-20
Ignition problems
•
Ignition coil
Inspect coil IG-9 or 12
•
(7M-GTE)
Igniter Inspect igniter IG-15
•
(7M-GE)
Distributor Inspect distributor IG-9
(7M-GTE)
Cam position sensor Inspect cam position sensor IG-16
•
High-tension cords Inspect high-tension cords
IG-6 or 11
Engine hesitates!
Spark plugs faulty Inspect plugs
IG-7
poor acceleration
Ignition wiring faulty
Inspect wiring
Incorrect ignition timing Reset timing IG-20
Muffler explosion
Incorrect ignition timing
Reset tirning IG-20
(after fire) all the
time
Engine backfires Incorrect ignition timing
Reset timing
IG-20
Poor fuel economy
Spark plugs faulty Inspect plugs
IG-7
Incorrect ignition timing Reset timing IG-20
Engine overheats Incorrect ignition timing
Reset timing
IG-20