Isuzu 20LE - Surges And;Or Chuggles Symptom

6E1-84 DRIVEABILITY AND EMISSIONS
Surges and/or Chuggles Symptom
Step Action Value(s) Yes No
DEFINITION: Engine power variation under steady throttle or cruise. Feels like the vehicle speeds up and slows
down with no change in the accelerator pedal.
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/
Physical
Check
4
Be sure that the driver understands A/C compressor
operation as explained in the owner's manual.
Inform the customer how the A/C clutch operate.
Is the customer experiencing a normal condition?
-
System OK Go to Step 5
5
Check the fuel control Heated Oxygen Sensor (HO2S) (If
applicable). When monitored on the Scan Tool, the HO2S
should respond quickly to different throttle positions. If it
doesn't check for silicon or other contaminants from fuel or
use of improper RTV sealant. The sensors may have a
white powdery coating. Silicon contamination sends a rich
exhaust signal which causes the ECM to command an
excessively lean air/fuel mixture.
Was a problem found?
-
Verify repair Go to Step 6
6
Check the fuel pressure. Refer to Fuel System Pressure
Test.
Was a problem found?
-
Verify repair Go to Step 7
7
Monitor "02 Status" on the Scan Tool (If applicable).
Is "02 Status" in the (rich condition)?
- Go to Step 8 Go to Step 9
8
Check items that can cause the engine to run rich.
Refer to Diagnostic Aids in Diagnostic Trouble Code 45 (If
applicable).
Was a problem found?
-
Verify repair Go to Step 10
9
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 10
10
Check for proper ignition voltage output with the spark
tester (Use commercially available tool).
Was a problem found?
-
Verify repair Go to Step 11
11
Check for a loose ignition control module ground.
Was a problem found?
-
Verify repair Go to Step 12