1990 MITSUBISHI SPYDER Service Repair Manual

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Page 585 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE (TURBO)
AND ENGINE> Troubleshooting
INSPECTION PROCEDURE 7
In cases such as the above, the cause is probably that the spark is weak and ignition is difficult,
the initia

Page 586 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual E N G I N E ( T U R B O )
AND ENGINE>
INSPECTION PROCEDURE 8
Unstable Rough
[Comment]
In cases such as the above, the cause is probably t hat the ignition system, air/fuel mixt

E N G I N E ( T U R B O )
AND ENGINE>
INSPECTION PROCEDURE 8
Unstable Rough
[Comment]
In cases such as the above, the cause is probably t hat the ignition system, air/fuel mixture, idle
air control motor or compression pressure is defect ive.
Because the range of possible causes is broad, insp ection is narrowed down to simple items.
W ere the battery terminals disconnected recently
NOAfter warming-up, let the
for minutes.’ ,
SCAN TOOL DTC YES
Are diagnostic trouble codes output Refer to INSPECTION FORDIAGNOSTICT R O U B L E C O D E S .
Does idle speed fluctuate excessively
NO(Refer to INSPECTION 39.)
Check the idle air control motor for operation soun d
control motor for operation sound engine>. (ReferNG .
Probable cause ,
Malfunction of the ignition of system
l M a l f u n c t i o n s y s t e ml Malfunction of the evaporative purge system-
l Poor compression
l Drawing air
exhaust system
Check the idle control system malfunction (Refer to INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLECODE
ChecktheinjectorforoperationI .
PROCEDURE FOR DIAGNOSTIC TROUBLE-CODES
Scan tool: Inspection when idle speed is unstable.
(Refer to INSPECTION PROCEDURE 40.)
Check the ignition timing. Engine (Turbo)>
(Refer to GROUP On-vehicle Service.)
Check the ignition timing. Engine>
(Refer to GROUP On-vehicle
Check that the crankshaft position sensor and timi ng belt cover are
installed properly.
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OK
SCAN TOOL Actuator test 10 EGR solenoid (Refer to NG.
OK
Check the exhaust gas recirculation solenoid malfun ction.(Refer to INSPECTION PROCEDURE FOR DIAGNOSTICTROUBLE CODE
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check the purge control System.
l Check the compression pressure.
l Check if foreign materials (water, alcohol, etc.) g ot into fuel.
l Check the EGR system.

Page 587 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE (TURBO)
AND Troubleshooting
INSPECTION PROCEDURE 9
speed is high. (Improper idle speed)
[Comment]
In such cases as the above, the cause is probably that the intake ai

Page 588 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE (TURBO)
AND
ENGINE> Troubleshooting
INSPECTION PROCEDURE 10
Idle speed is low. (Improper idle speed)“ P r o b a b l e c a u s e , .
[Commentjl Malfunction of the systemI

Page 589 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE (TURBO)
AND ENGINE> Troubleshooting
INSPECTION PROCEDURE 11
When the engine is cold, it stalls at idle. (Die out)P r o b a b l e c a u s e .
[Comment]l Malfunction of the

Page 590 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE (TURBO)
AND ENGINE> Troubleshooting
INSPECTION PROCEDURE 12.
When the engine is hot, it stalls at idle. (Die out)Probable cause
l Malfunction of the ignition system In case

ENGINE (TURBO)
AND ENGINE> Troubleshooting
INSPECTION PROCEDURE 12.
When the engine is hot, it stalls at idle. (Die out)Probable cause
l Malfunction of the ignition system In cases such as the above, the cause is probably t hat ignition system, air/fuel mixture, idle airl Malfunction control systemcontrol motor or compression pressure is defective.l M a l f u n c t i o n o f system In addition, if the engine suddenly stalls, the cau se may also be a defective connector contact.l Drawing air into intake system
l I m p r o p e r c o n n e c t o r c o n t a c t
W ere the battery terminals disconnected recently After warming-up, let the engine run at idling for minutes.
NO
SCAN TOOL DTC
Are diagnostic trouble codes output?YESRefer to I N S P E C T I O N C H A R T TROUBLE CODES.
Check the idle air controlEngine (Refer Check the idle control system malfunction (Refer to
INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE CODE
Check the idle air control motor for operation soun d
(Refer to
Checktheinjectorforoperati
OKPROCEDURE FOR DIAGNOSTIC ,
I
Does the engine stall N O While carrying out an intermittent malfunction sim
ulation test (Refer
YESto GROUP 00 How to Cope with Intermittent Malfunctions, check
for sudden changes in the signals shown below.
Scan tool: Inspection when engine stalls when the e nginel Crankshaft position sensor Primary is warm and idling INSPECTION signal signal
CEDURE 41.) Volumeairflowsensorsignal l
Fuel pump drive signal
OK l
Injector drive signal l ECM power supply voltage
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Check the ignition timing. Engine (Turbo)>
(Refer to GROUP On-vehicle Service.)
Check the ignition timing. Engine>
(Refer to GROUP On-vehicle Service.)
Check that the crankshaft position sensor and timin g belt cover are
installed properly.
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check if the injectors are clogged.
l Check the compression pressure.
l Check if foreign materials (water, alcohol, etc.) g ot into fuel.

Page 591 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE (TURBO)
AND ENGINE> Troubleshooting
INSPECTION PROCEDURE 13,
The engine stalls when accelerating. (Pass out)Probable
[Comment]l
Drawing air into intake system
In cases such a

ENGINE (TURBO)
AND ENGINE> Troubleshooting
INSPECTION PROCEDURE 13,
The engine stalls when accelerating. (Pass out)Probable
[Comment]l
Drawing air into intake system
In cases such as the above, the cause is probably m isfiring due to a weak spark, or an M a l f u n c t i o n o f system
air/fuel mixture when the accelerator pedal is depressed.
SCAN TOOL DTCYES
Are diagnostic trouble codes output
N O
Check the following items. l Check the ignition coil, spark plugs, spark plug ca bles.
l Check if air was drawn into the intake system.
Broken intake manifold gasket
Broken or disconnected vacuum hose Refer to
INSPECTION CHART FOR DIAGNOSTICTROUBLE CODES.
.
Improper operation of the PCV valve
Broken air intake hose
INSPECTION PROCEDURE 14
The engine stalls when decelerating. Probable
[Comment]l
Malfunction of the system.In cases such as the above, the cause is probably t hat the intake air volume is insufficient dueto a defective idle air control motor system.
W ere the battery terminals disconnected recently
NOAfter warming-up, let the engine
at-idling for 10
SCAN TOOL DTC
Are diagnostic trouble codes output? Refer to INSPECTION CHART FOR DIAGNOSTICTROUBLE CODES.
SCAN TOOL Data list
26 Closed throttle position switch (Refer to Check the closed throttle position switch system.(Refer to INSPECTION PROCEDURE FOR TROUBLE CODE
SCAN TOOL Data list 14 Throttle position sensor (Refer to Check the malfunction (Refer to IN- PROCEDURE FOR DIAGNOSTIC TROUBLE CODE
SCAN TOOL Data list YES
45 Idle air control motor position
Engine (Turbo)>
55 Idle air control valve position sensor Engine>lIs the idle speed control motor position drops to steps when decelerating (engine rpm less than 1
Check the vehicle speed sensor malfunction (Refer to PROCEDURE FOR DIAGNOSTIC TROUBLE CODE
N O
Check the following items.’
l Check the ignition coil, spark plugs, spark plug ca bles.
l Clean the throttle valve area.
l Check and adjust the fixed SAS.
Revision

Page 592 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE (TURBO)
AND ENGINE> T r o u b l e s h o o t i n g
INSPECTION PROCEDURE 15
Hesitation, sag or stumbleProbable
[Comment]Malfunction of the ignition system
In cases such as the a

ENGINE (TURBO)
AND ENGINE> T r o u b l e s h o o t i n g
INSPECTION PROCEDURE 15
Hesitation, sag or stumbleProbable
[Comment]Malfunction of the ignition system
In cases such as the above, the cause is probably t hat ignition system, air/fuel or l of pressure is defective. of the fuel l Malfunction of the system Poor compression Malfunction of the turbocharger,
Arediagnostic trouble codesoutput
Check the injectors for operationsound.(Refer to
OK
Refer to INSPECTION FOR DIAGNOSTICTROUBLE CODES.. .
Check the injector circuit malfunction PROCEDURE FOR DIAGNOSTIC
Check the ignition timing. Engine (Turbo)>
(Refer to GROUP On-vehicle Service.)
Check the ignition timing.
(Refer to GROUP 11 On-vehicle Service.)
Check that the crankshaft position and cover installed properly.
OK
Scan Tool: Inspection when hesitation, sag, stumble or pooracceleration occurs. (Refer to INSPECTION
PROCEDURE 42.)
IOK
Check the fuel pressure. (Refer to
O K
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check supercharging pressure.
l Check intake charge pressure control system.
l Check rotating resistance of turbocharger turbine w heel. (Does the wheel rotate smoothly?)
Check the EGR system.l Check the compression pressure.lCheck the fuel filter or fuel line for clogging.
INSPECTION PROCEDURE 16
Acceleration shock
[Comment]
In cases such as the above, the cause is probably t hat there is an ignition leak accompanying
the increase in the spark plug demand voltage durin g acceleration.
Probable cause
M a l f u n c t i o n system
SCAN TOOL DTC
Are diagnostic trouble codes output
NORefer to
INSPECTION CHART FOR DIAGNOSTIC
T R O U B L E C O D E S .
,
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check for occurrence of ignition leak.
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