Toyota Land Cruiser 1988 Repair Manual page 35

EM-4 ENGINE MECHANICAL- Troubleshooting
ENGINE DIESELING
Problem Possible cause
Remedy Page
Engine diesels EFI system problems Repair as necessary
(runs after ignition
switch turned off)
AFTER FIRE, BACKFIRE
Problem
Possible cause
Remedy Page
Muffler explosion Deceleration fuel cut system always off Check EFI (fuel cut) system
(after fire) on
deceleration only
Muffler explosion Air cleaner clogged
Check air cleaner MA-5
(after fire) all the
EFI system problem Repair as necessary
time
Incorrect ignition timing
Reset timing IG-11
Engine backfires EFI system problem Repair as necessary
Vacuum leak Check hoses and repair as
• PCV line
necessary
• EGA line
• Intake manifold
• Air intake chamber
• Throttle body
• ISC valve
• Brake booster line
Pulling in air between air flow meter Repair as necessary
and throttle body
Insufficient fuel flow Troubleshoot fuel system Fl-9
Incorrect ignition timing Reset timing IG-11
Incorrect valve clearance Adjust valve clearance EM-7
Carbon deposits in combustion chambers Inspect cylinder head EM-11
EXCESSIVE OIL CONSUMPTION
Problem Possible cause Remedy
Page
Excessive oil Oil leak
Repair as necessary
consumption
PCV line clogged Check PCV system EC-4
Piston ring worn or damaged Check rings EM-60
Valve stem and guide bushing worn Check valves and guide
bushing EM-18
Valve stem oil seal worn Check seals