1990 MITSUBISHI SPYDER spark plugs replace

GENERAL Maintenance
Incorrect Correct
5. SPARK PLUGS
1.Spark plugs must spark properly to assure proper engine
performance and reduce exhaust emission
Therefore, they should be periodically with new
ones.
2. The new plugs should be checked gap.
Spark plug gap:, . .
Engine (Turbo)>’
mm
Engine (Non-turbo)> ,
1.22-1.35 mm
in.)
Engine> .
in.)
3. Install the spark plug and tighten to the
Tightening torque:
Engine (Turbo) and Engine>
25 Nm (18
E n g i n e ( N o n - t u r b o ) >
28 Nm (20
6. IGNITION CABLES (Replace)
The ignition cables should. be replaced periodicall y with new
ones. After replacing, make sure that the ignition cables are
routed properly and fully seated.
NOTE
When disconnecting an ignition cable; be sure to ho ld the
cable boot. If the cable is disconnected by pulling on the
cable alone, an open circuit might result.
7. TIMING BELT (Replace)
00100220027
Replace the belt with a new one periodically to ass ure proper
engine performance.
For disassembly and assembly procedures; Refer to GROUP
Timing Belt.
Refer to GROUP
Timing Belt.
Refer to GROUP 11
Timing Belt.
8. DRIVE BELT (For Generator, Water Pump, Power Steering Pump) (Check condition)
Check the tension of the drive belt. Check the driv e belt
for evidence of cuts and cracks, and replace it if defective.
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ENGINE On-vehicle
8. If the standard value is exceeded, check the following
items:
l Diagnostic output
l Closed-loop control (When the closed-loop control
is carried out normally, the output signal of the h eated
oxygen sensor repeats between and
,000 at idle.)
l Fuel pressure
I n j e c t o r
lIgnition coil, spark plug cable, spark plug
lEGR system and the EGR valve leak
l Evaporative emission control system
Compression pressure
NOTE
Replace the catalyst whenever the
HC contents do not remain inside the standard value .
(even though the result of the inspection is
all items.).
C O M P R E S S I O N
CHECK
1.Before inspection, check that the engine-oil, start er
battery are normal. Also, set the to the
condition:
lEngine coolant temperature:
lLights, electric cooling fan and all accessories: O FF
lTransaxle: Neutral (P range on vehicles with
2. Disconnect the spark plug cables.
3. Remove all of the spark plugs.
4.
5.
Disconnect the crankshaft position sensor connector .
NOTE
Doing this will prevent the engine control unit fro m carrying
out ignition and fuel injection.
Cover the spark plug hole with a shop towel etc., a nd
after the engine has been cranked, check that no fo reign
material is adhering to the shop towel.
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ENGINE On-vehicle Service
IDLE MIXTURE CHECK
11100210081
1.Before inspection, set vehicles in the following co ndition:
lEngine coolant temperature:
l Lights, electric cooling fan and all accessories: O FF
lTransaxle: Neutral (P range on vehicles with
2.After turning the ignition switch to OFF, connect t he scan
tool to the data link connector.
3.Start the engine and run it at 2,500 for 2 minutes.
4. Set the CO, HC tester.
5. Check the CO contents and the HC contents at idl e.
Standard value:
CO contents: 0.5% or less
HC contents: 100 ppm or less
6. If the idle speed is outside the standard value, check
the following items: l Diagnostic output
l Closed-loop control (When the closed-loop control
is carried out normally, the output signal of the h eated
oxygen sensor repeats between and
,000 at idle.)
l Fuel pressure
I n j e c t o r
lIgnition coil, spark plug cable, spark plug
lEGR system and the EGR valve leak
l Evaporative emission control system
Compression pressure
NOTE
Replace the three-way catalyst whenever the CO and
HC contents do not remain inside the standard value .
(even though the result of the inspection is normal on
all items.)
COMPRESSION PRESSURE CHECK
1.Before inspection, check that the engine oil, start er and
battery are normal. Also, set the vehicle to the fo llowing
condition:
lEngine coolant temperature:
lLights, electric cooling fan and all accessories: O FF
lTransaxle: Neutral (P range on vehicle with
2. Disconnect the spark plug cables.
3. Remove all spark plugs.
4.Disconnect the relay (ASD relay) connector to prevent
a spark.
4 4
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On-vehicle
Run the engine.
8. Set CO, HC tester.
7. Check the CO contents and the HC contents at idle.
Standard value:
CO contents: 0.5% or less
HC contents: 100 ppm or less
8. the standard value is exceeded, check the following
items:
l Diagnostic output
l Closed-loop control (When the closed-loop control
is carried out normally, the output signal of the heated
oxygen sensor and
at idle.)
l
Injector
lIgnition coil, spark plug
l system the
l Evaporative emission
Compression ,
NOTE,
Replace the three-way CO and
HC contents do not
the value.
(even though the
of the” on
all items.)
PRESSURE CHECK
1.Before inspection, check that the engine oil, start er and
battery are normal. Also, set the vehicle to the fo llowing
condition:
lEngine coolant temperature:
lLights, electric cooling fan and all accessories: O FF
lTransaxle: Neutral (P range on vehicles with
2. Disconnect the spark plug cables.
3. Remove all of the spark plugs.
4. Disconnect the crankshaft position sensor
NOTE
Doing this will prevent the engine control unit fro m carrying
out ignition and fuel injection.
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ENGINE Troubleshooting
INSPECTION PROCEDURE 4
The check engine/malfunction indicator lamp remains
illuminated and never goes out.
[Comment]In cases such as the above, the cause is probably t hat the PCM is
detecting a problem in a sensor or actuator, or tha t one of the malfunctions listed at right has
occurred.
Probable cause
l Short-circuit between the check indicator lamp and l Malfunction of the PCM
SCAN TOOL DTC Refer to
INSPECTION CHART FOR DIAGNOSTIC
Are diagnostic trouble codesoutput? TROUBLE CODES
Measure at the combination meter connector lDisconnect the connector, and measure at the harnes s
side.Check the harness wire between meter and PCM
connector. Repair, if necessary.
l Disconnect the PCM connector.
l Continuity between 51 and ground
OK: No continuity
O K
Replace the PCM.
INSPECTION PROCEDURE 5
Cranks, won’t start Probable cause
[Comment]l Malfunction of the ignition system
In cases such as the above, the cause is probably t hat a spark plugs are fouled defective,l Malfunction of the fuel pump system
or that the supply of fuel to the combustion chambe r is defective.
l Malfunction of the injector system
in addition, foreign materials (water, kerosene, et c.) may be mixed with the fuel.
l Malfunction of the PCM
l Foreign materials in fuel
,
Check battery positiv
OK: 8 or hiaher Check the battery. (Refer to GROUP 54 Battery)
OK
Scan tool: Inspection when no initial combustion oc
curs.
(Refer to INSPECTION PROCEDURE 29.)
OK
Can any sound be heard
.
(Refer to
Yes
Check ignition circuit system.
(Refer to INSPECTION PROCEDURE 28.)
OK
Check the injector control circuit. Carry out proce dures 19, 20, 21, in “INSPECTION PROCEDURE
FOR DIAGNOSTIC TROUBLE CODES”.,
Check the following items. l Check the ignition coil, spark plugs, spark plug ca bles.
l Clean the injectors.
l Check if foreign materials (water, alcohol, etc.) g ot into fuel.
l Check the compression pressure.
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E N G I N E
INSPECTION PROCEDURE 22
Too high CO and HC concentration when idling
[Comment]Abnormal air-fuel ratio is suspected.
cause
of the air-fuel ratio control system.l Deteriorated catalyst .
SCAN TOOL DTC
Are diagnostic trouble codes output Refer to INSPECTION CHART FOR DIAGNOSTICTROUBLE CODES.
NG
27 Intake air temperature sensor. (Refer to Check the intake air temperature sensor circuit.
( R e f e r t o 3 9 . ) .
N G Check the MAP sensor circuit11MAP sensor reading. (Refer to (Refer to INSPECTION PROCEDURE 40.)IOK
SCAN TOOL SENSOR READ TESTS (Data list)
83 sensor volts (rear) (Refer to l Transaxle gear range l Driving with the throttle wide open
O K :
OK
SCAN TOOL SENSOR READ TESTS (Data list)
02 sensor volts (front) (Refer to OK: 1 when suddenlv
N G Check the heated oxygensensor (rear) circuit.
(Refer to INSPECTION PROCEDURE 41.)
NG
02 sensor volts (front) (Refer to
Check the fuel pressure. (Refer to
OK
Check the following items.
l Check the injectors for operation sound.
l Check the injectors for fuel leakage.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check the compression pressure.
l Check the positive crankcase ventilation system.
l Check the evaporative emission control system.
l Check the EGR system.
NG
Check trouble symptom.
N G
Replace the three-way catalytic converter.
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E N G I N E ( T U R B O ) .
AND ENGINE> ,
Code No. Random Misfire Detected
[Comment]l Ignition system related part(s) BackgroundlIf a misfiring occurs while the engine is running, the engine speed suddenly changes.l
Poor crankshaft sensor l Incorrect air/fuel ratiol The engine control module checks for changes in the engine speed.
l Low compression
Check ArealEngine coolant sensor: l 5 or more have passed after the engine was started. l
liming belt broken
l Engine speed is at between 500 and 6000 l Injector failedl Engine coolant temperature is or higher, l
EGR valve failed
l Intake air temperature is or higherlEngine control l Barometric pressure is 76 (11 psi.) or higher.l Running free from sudden accelerations/deceleration s such as shift change.
Judgement Criteria. .
(change in the angular acceleration of the crankshaft is used for misfire detection.)lMisfire has occurred more frequently than allowed during the last 200 revolutions [when
the catalyst temperature is higher than
orlMisfire has occurred in 20 or more of the last 1000 revolutions (corresponding to 1.5
times the limit of emission standard.) I,
SCAN TOOL Data list
22 Crankshaft position sensor (Refer to
l Crankshaft position sensor wave form check
l Engine speed: stable
OK: Constant pulse range
OK
position sensor and
Check the injector (Refer toNG Replace
Check the fuel trim malfunction (bank 1) (Refer to IN-SPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE
OK
SCAN TOOL list
21 Engine coolant temperature sensor (Refer to
OK
Check the engine coolant temperature circuit malfu nction (Refer
to INSPECTION PROCEDURE FOR DIAGNOSTICTROUBLE CODE 5.)
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check the compression pressure.
l Check for broken timing belt teeth.
l Check the EGR system and the EGR valve.
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ENGINE (TURBO)
ENGINE>
Code No. Misfire Detected (Cylin-
der-l,
[Comment]Background
lif a misfiring occurs while the engine is running, the engine speed suddenly changes.
l The engine control module checks for changes in the engine speed.
Check Areal 5 or more have passed after the engine was started.l Engine speed is at between 500 and 6000 l Engine coolant temperature is or higher.
l Intake air temperature is or higher
l Barometric pressure is 76 (11 psi.) or higher.
l Running free from sudden accelerations/deceleration s such as shift change.
Judgement Criteria(change in the angular acceleration of the crankshaft is used for misfire detection.)lMisfire has occurred more frequently than allowed during the last 200 revolutions [when
the catalyst temperature is higher than
or l Misfire has occurred in 20 or more of the last 1000 revolutions (corresponding to 1.5
times the limit of emission standard.)
l l Low compression l Injector failed
l Engine
Check the injector (Refer
OK
Replace
Check the following connectors: __ Repair,OK
[Check the harness wire between the ECM and the inj ectorNG ,
connector
Check the following items.
l Check the spark plugs, spark plug cables.
l Check the compression pressure
Code No. Knock Sensor 1 Circuit Malfunction
Engine (Turbo)>
l sensor failed BackgroundlThe knock sensor converts the vibration of the cyli nder block into a voltage and outputs
it. If there is a malfunction of the knock sensor, the voltage output will not change.
l The engine control module checks whether the voltag e output changes.
Check Areal Ignition switch: ONl60 or more have passed after the ignition switch was turned on or the starting sequencewasl Engine speed is higher than 2000
Judgement CriterialKnock sensor output voltage (knock sensor peak volt age in each deg period of the
crankshaft) has not changed more than 0.06 in the last consecutive 200 periods.
lOpen or shorted knock sensor circuit, or connector
l Engine control module failed
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