Toyota Supra 1990 Manual page 38

EM-6 ENGINE MECHANICAL - Troubleshooting
TROUBLESHOOTING (Cont'd)
Problem
Possible cause Remedy
Page
Excessive oi I consumption Oil leak
Repair as necessary
LU-7
PCV line clogged
Check PCV system
EC-5
Piston rings worn or damaged
Check rings
EM-63
Valve stem and guide worn
Check valves EM-32
Valve stem seal worn
Check seals EM-32
Poor fuel economy
Fuel leak
Repair as necessary
Air cleaner clogged
Check ai r cleaner
MA-5
Incorrect ignition timing
Reset timing
IG-20
E F I system problems
Repair as necessary
•
I njector faulty
•
Deceleration fuel cut system faulty
Id Ie speed too high
Check I SC system
FI-106
Spark plugs faulty
Inspect plugs
IG-7
EGR system always on
Check EG R system EC-12,16
Low compression
Check compression
EM-20,21
Tires improperly inflated
Inflate tires to proper pressure
Clutch sl ips
Troubleshoot clutch
Brakes drag
Troubleshoot brakes
Unpleasant odor I ncorrect idle speed
Check ISC system
FI-106
Incorrect ignition timing
Reset timing IG-20
Vacuum leaks
Repair as necessary
•
PCV hoses
•
EGR valve
•
Intake manifold
•
Air intake chamber
•
Throttle body
E F I system problems
Repair as necessary