Toyota 7M-GE Repair Manual page 12

ENGtNE MECHANKAL
- Troubleshootinn
EM-S
TROUBLESHOOTING
-.
Problem
Possible cause
Remedy Page
sough idle, stalls or
Spark plugs faulty
Inspect plugs
IG-7
misses
Engine overheats
Check cooling system co-4
Low compression
Check compression EM-26, 2;
Engine hesitates/
Vacuum leaks
Repair as necessary
poor acceleration 0 PCV hoses
. (w/ EGR)
EGR valve
0 Intake manifold
0 Air intake chamber
.c
0 Throttle body
0 ISC valve
Pulling in air between air flow meter and
Repair as necessary
FI-96, 96
throttle body
Incorrect ignition timing
Reset timing _
EM-1 7
Emission control system problem
(cold engine)
0 (w/ EGR)
EGR system always on
Check EGR system
High-tension cord faulty
Inspect cord
1G-6,
Fuel system clogged
Check fuel system
FI-7
Air cleaner clogged
Check air cleaner
EM-7
EFI system problems
Repair as necessary
Spark plugs faulty
Inspect plugs
IG-7
Engine overheats
Check cooling system
co-4
Low compression
Check compression
EM-26, 2
Engine diesels
EFI system problems
Repair as necessary
(runs after ignition
switch is turned off)
Muffler explosion
Deceleration fuel cut system always off
Check EFI (fuel cut) system
FI-128
(after fire) on
deceleration only
Muffler explosion
Air cleaner clogged
Check air cleaner
EM-7
(after fire) all the time
EFI system problem
Repair as necessary
incorrect ignition timing
Reset timing
EM-l.7
Engine backfires
Vacuum leak
Check hoses and repair as
l
PCV hoses
necessary
. (w/ EGR)
EGR valve
c
0 Intake manifold
0 Air intake chamber
l
Throttle body
0 ISC valve
Pulling in air between air flow meter and
Repair as necessary
Fl-96, 91
throttle body
EFI system problem
Repair as necessary
Insufficient fuel flow
Troubleshoot fuel system
Incorrect ignition timing
Reset timing
EM-l 7
Carbon deposits in combustion chambers
Inspect cylinder head
EM-97