Hyundai Sonata 1991 Shop Manual page 234

Check ignition timing
-
Basic : 5° ± 2°BTDC at curb idle
Actual : 10 0 BTDC
OK
Check fuel supply to injector
f -
o Fuel in tank
o Fuel pressure
[Refer to page 31-34)
OK
Check spark plugs
Standard : 1.0-1.1 mm (0.039-
0.043 in.)
o Check compression and valve
clearance if necessary
o Compression
Limit: 10.5 kg/cm
2
(1050 kPa,
150 psil/[25D-400 rpm)
o Valve clearance
[Refer to page 10-61)
OK
II
Check MPI electronic circuit
GENERAL
----~
Wrong
----~
Wrong
----~
Wrong
o Ignition timing-adjust
[Refer to page 27-36)
o Fuel line (leakage, deformation)
o Fuse
o Fuel pump [Refer to page 31-33)
o Fuel filter
o Fuel pressure regulator
o Wiring connections
o Power to ECU
1. Fusible links
2. Fuses
3. MPI control relay
o Engine coolant temperature
sensor
o Intake air temperature sensor
o Injection signal circuit
1. Injector wiring
2. ECU
o TPS
oAFS
31-9