Isuzu engine C22NE / 22LE / 20LE. Service manual — part 64
DRIVEABILITY AND EMISSIONS 6E1-85
Surges and/or Chuggles Symptom (Cont'd)
Step
Action
Value(s)
Yes
No
12
Visually/Physically inspect the secondary ignition wires.
Check for the following conditions.
• Verify that all ignition wire resistance are less than the
specified value.
• Verify that ignition wires are correctly routed to eliminate
cross-firing.
• Verify that ignition wires are not arcing to ground.
Spraying the secondary ignition wires with a light mist of
water may help locate an intermittent problem.
Was a problem found?
#1 cyl. 4.7k
Ω
#2 cyl. 3.9k
Ω
#3 cyl. 3.4k
Ω
#4 cyl. 3.1k
Ω
Verify repair
Go to Step 13
13
1. Check ignition coil secondary resistance.
2. Replace the coil if it is greater than the specified
resistance.
Did the coil require replacement?
2.5 k
Ω
Verify repair
Go to Step 14
14
1. Remove the spark plugs and check for gas or oil
fouling cracks, wear, improper gap, burned electrodes,
heavy deposits or improper heat range.
2. If spark plugs are fouled, the cause of fouling must be
determined before replacing the spark plugs.
Was a problem found?
-
Verify repair
Go to Step 15
15
1. Check the injector connectors.
2. If any of the connectors are connected at an improper
cylinder, correct as necessary.
Was a problem found?
-
Verify repair
Go to Step 16
16
Check the ECM grounds to verify that they are clean and
tight. Refer to the ECM wiring diagrams in Electrical
Diagnosis.
Was a problem found?
-
Verify repair
Go to Step 17
17
Visually/Physically check the vacuum hoses for splits,
kinks and proper connections and proper connections and
routing as shown on the "Emission Control System
Schematics".
Was a problem found?
-
Verify repair
Go to Step 18
18
Check the exhaust system for a possible restriction:
• Damaged or collapsed pipes
• Internal muffler failure
-
Verify repair
Go to Step 19
19
1. Review all the diagnostic procedures within this table.
2. If all procedures have been completed and no
malfunctions have been found, review/inspect the
following:
• Visual/physical inspection.
• Scan Tool data.
• All electrical connections within a suspected circuit
and/or system.
Was a problem found?
-
Verify repair
Contact
Technical
Assistance
6E1-86 DRIVEABILITY AND EMISSIONS
Lack of Power, Sluggish or Spongy Symptom
Step
Action
Value(s)
Yes
No
DEFINITION: Engine delivers less than expected power. Little or no increase in speed when accelerator pedal is
pushed down part-way.
1
Was the On-Board Diagnostic (OBD) System Check
performed?
-
Go to Step 2
Go to OBD
System
Check
2
1. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,
correct the condition as instructed in the bulletin.
Was a bulletin found that addresses the symptom?
-
Verify Repair
Go to Step 3
3
Was a visual/physical check performed?
-
Go to Step 4
Go to
Visual/Physic
al Check
4
1. Remove and check the air filter element for dirt or
restrictions. Refer to Air Intake System in On-Vehicle
Service.
2. Replace the air filter element if necessary.
Was a repair required?
-
Verify repair
Go to Step 5
5
Check for proper ignition voltage output with the spark
tester (Use commercially available tool).
Was a problem found?
-
Verify repair
Go to Step 6
6
1. Remove the spark plugs and check for gas or oil
fouling, cracks, wear, improper gap, burned electrodes,
heavy deposits or improper heat range.
2. If spark plugs are fouled, the cause of fouling must be
determined before replacing the spark plugs.
Was a problem found?
-
Verify repair
Go to Step 7
7
Check the fuel pressure. Refer to Fuel System Pressure
Test.
Was a problem found?
-
Verify repair
Go to Step 8
8
Check for water or alcohol contaminated fuel.
Was a problem found?
-
Verify repair
Go to Step 9
9
Check the ECM grounds to verify that they are clean and
tight. Refer to the ECM wiring diagrams in Electrical
Diagnosis.
Was a problem found?
-
Verify repair
Go to Step 10
10
Check the exhaust system for a possible restriction:
• Damaged or collapsed pipes
• Internal muffler failure
Was a problem found?
-
Verify repair
Go to Step 10
DRIVEABILITY AND EMISSIONS 6E1-87
Lack of Power, Sluggish or Spongy Symptom (Cont'd)
Step
Action
Value(s)
Yes
No
11
Check for the following engine mechanical problems:
• Low compression
• Leaking cylinder head gasket
• Worn or incorrect camshaft
• Loose timing belt
Was a problem found?
-
Verify repair
Go to Step 12
12
1. Review all the diagnostic procedures within this table.
2. If all procedures have been completed and no
malfunctions have been found, review/inspect the
following:
• Visual/physical inspection.
• Scan Tool data.
• All electrical connections within a suspected circuit
and/or system.
Was a problem found?
-
Verify repair
Contact
Technical
Assistance
6E1-88 DRIVEABILITY AND EMISSIONS
Detonation/Spark Knock Symptom
Step
Action
Value(s)
Yes
No
DEFINITION: A mild to severe ping, usually worse under acceleration. The engine makes sharp metallic knocks
that change with throttle opening.
1
Was the On-Board Diagnostic (OBD) System Check
performed?
-
Go to Step 2
Go to OBD
System
Check
2
1. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,
correct the condition as instructed in the bulletin.
Was a bulletin found that addresses the symptom?
-
Verify Repair
Go to Step 3
3
Was a visual/physical check performed?
-
Go to Step 4
Go to
Visual/Physic
al Check
4
1. If scan tool readings are normal (refer to Typical Scan
Values) and there are no engine mechanical faults, fill
the fuel tank with a known quality gasoline that has a
minimum octane rating Showing on the applicable
specification list.
2. Re-evaluate the vehicle performance.
Is detonation present?
-
Go to Step 5
Verify Repair
5
1. Check for obvious overheating problems:
• Low engine coolant.
• Restricted air flow to radiator, or restricted water flow
through radiator.
• Incorrect coolant solution. It should be a 50/50 mix of
approved antifreeze/water.
2. If a problem is found, repair as necessary.
Was a problem found?
-
Verify repair
Go to Step 6
6
Check fuel pressure. Refer to Fuel System Pressure Test.
Was a problem found?
-
Verify repair
Go to Step 7
7
Check items that can cause the engine to run lean.
Refer to Diagnostic Aids in Diagnostic Trouble Code 44 (If
applicable).
Was a problem found?
-
Verify repair
Go to Step 8
8
Check spark plugs for proper heat range. Refer to General
Information.
Were incorrect spark plugs installed?
-
Verify repair
Go to Step 9
9
1. Remove excessive carbon buildup with a top engine
cleaner. Refer to instructions on the top engine cleaner
can.
2. Re-evaluate vehicle performance.
Is detonation still present?
-
Go to Step 10
Verify repair
10
Check for an engine mechanical problem. Perform a
cylinder compression check. Refer to Engine Mechanical.
Was a problem found?
-
Verify repair
Go to Step 11
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