MPI –
Troubleshooting
13-23
INSPECTION PROCEDURE 6
Initial combustion but no complete combustion
(starting impossible)
Probable cause
In such cases as the above, the cause is probably that the spark plugs are generating
sparks but the sparks are weak, or the initial mixture for starting is not appropriate.
D
Malfunction of the ignition system
D
Malfunction of the injector system
D
Foreign materials in fuel
D
Poor compression
D
Malfunction of the engine-ECU
Check system voltage when cranking.
OK: 8 V or higher
NG
Check the battery.
OK
MUT-
II
: Check if uncompleted combustion occurs.
(Refer to P.13-48, INSPECTION PROCEDURE 39.)
OK
Can any sound be heard from the injectors when cranking (check
using a soundscope)?
NG
Check the injector system, (Refer to P.13-15, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE 41.)
OK
Is starting good if the engine is cranked with the accelerator pedal
slightly depressed?
Yes
Check ISC servo for op-
eration sound.
NG
Check the ISC servo sys-
tem. (Refer to P.13-44, IN-
SPECTION PROCE-
DURE 33.)
OK
D
Clean the throttle valve area.
D
Adjust the fixed SAS. (Refer to P.13-30.)*
No
Check the ignition timing when cranking.
OK: Approx. 5
_
BTDC
NG
Check that the crank angle sensor and the timing belt cover are
installed properly.
OK
Check the following items.
D
Check the ignition coil, spark plugs, spark plug cables.
D
Check the injectors for clogging and leakage.
D
Check the compression pressure.
D
Check fuel lines for clogging.
D
Check if foreign materials (water, alcohol, etc.) got into fuel.
NOTE
*:
Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).