MPI <4G1> -
Troubleshooting
13A-54
INSPECTION PROCEDURE 18
Poor acceleration
Probable cause
Defective ignition system, abnormal air-fuel ratio, poor compression pressure, etc.
are suspected.
D
Malfunction of the ignition system
D
Malfunction of air-fuel ratio control system
D
Malfunction of the fuel supply system
D
Poor compression pressure
D
Clogged exhaust system
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13A-9, INSPECTION CHART FOR DIAGNOSIS
CODES.
No
Check the injectors for operation sound.
NG
Check the injector system. (Refer to P.13A-26, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE P0201, P0202, P0203, P0204.)
OK
Check the ignition timing.
(Refer to GROUP 11B - On-vehicle Service.)
NG
Check that the distributor is installed properly.
OK
Check the fuel pressure. (Refer to P.13A-78*.)
OK
Check the following items.
D
Check the ignition coil, spark plugs, spark plug cables. (Refer to GROUP 16 - On-vehicle Service.)
D
Check the compression pressure. (Refer to GROUP 11B - On-vehicle Service.)
D
Check the fuel filter or fuel line for clogging.
D
Broken air intake hose
D
Clogged air cleaner
OK
MUT-
II
Data list
13 Intake air temperature sensor (Refer to P.13A-65.)
NG
Check the intake air temperature sensor system.
(Refer to P.13A-12, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE P0110.)
OK
MUT-
II
Data list
21 Engine coolant temperature sensor (Refer to P.13A-66.)
NG
Check the engine coolant temperature sensor system.
(Refer to P.13A-13, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE P0115.)
OK
MUT-
II
Data list
14 Throttle position sensor (Refer to P.13A-65.)
NG
Check the throttle position sensor system. (Refer to P.13A-16, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0120.)
OK
MUT-
II
Actuator test
10 EGR control solenoid valve (Refer to P.13A-70.)
NG
Check the EGR control solenoid valve system. (Refer to P.13A-32,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0403.)
OK
MUT-
II
Data list
59 Oxygen sensor (rear)
D
Transmission: 2nd gear
D
Driving with throttle widely open
OK:
600 - 1,000 mV
NG
Check the oxygen sensor (rear) system. (Refer to P.13A-22, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0136.)
OK
MUT-
II
Data list
11 Oxygen sensor (front)
OK:
600 - 1,000 mV during sudden racing
NG
Check the oxygen sensor (front) system. (Refer to P.13A-19, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0130.)
OK
MUT-
II
Data list
11 Oxygen sensor (front)
OK:
Changes between 0 - 400 mV and 600 - 1,000 mV during
idling
NG
Check the fuel pressure.
(Refer to P.13A-78*.)
OK
1. Inspect the intake of
air into the air intake
system.
D
Broken intake man-
ifold gasket
D
Broken vacuum hose
D
PCV valve does not
operate.
D
Broken air intake hose
2. Check the injector for
clog.
NOTE:
*: Refer to the ’96 COLT/LANCER Workshop Manual (Pub. No. PWME9511).