Hyundai Sonata 1991 Shop Manual page 238

GENERAL
-----l1L----,
I Check injectors
r- - - - -
-1
Injector condition
Wrong - - - - - - - - - - - - - - -
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]
JOK
Check MPI electronic circuit
- - - - - - ; ,
Wrong
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
31-13