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Home >> Isuzu >> 2004 >> Axiom Base, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Information & Procedures >> Symptom Diagnosis >> Sluggish, or Spongy Symptoms

Sluggish, or Spongy Symptoms

DEFINITION:  Engine delivers less than expected power. Little or no increase in speed when accelerator pedal is pushed down part-way.

SLUGGISH, OR SPONGY SYMPTOMS

Step Action Values Yes No
1 Was the "On-Board Diagnostic (OBDII) System Check" performed? - Go to Step 2 Go to On-Board Diagnostic (OBD-II) System Check
2 Was the "Electric Throttle Control (ETC) System Check" performed? - Go to Step 3 Go to On-Board Diagnostic (OBD-II) System Check
3
  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 4
4 Was a visual/physical check performed? - Go to Step 5 Go to VISUAL/PHYSICAL CHECK 
5
  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 6
6
  1. Check for fuel pressure. Refer to Fuel System Check (High Pressure Line) or Fuel System Check (Low Pressure Line) .
  2. If a problem is found, repair as necessary.
Was a problem found?		 - Verify repair Go to Step 7
7
  1. Check for water- or alcohol-contaminated fuel.
  2. Check for fuel valve level.
  3. If a problem is found, repair as necessary.
Was a problem found?		 - Verify repair Go to Step 8
8
  1. Install the Tech 2.
  2. Run the engine at idle.
  3. On the Tech 2, select F3: Miscellaneous Test, F6: Variable Intake Manifold.
  4. Repeat Switch ON or OFF of VIM solenoid valve by using the Tech 2.
  5. Check to see if the actuator works normally.
  6. If a problem is found, repair as necessary.
Was a problem found?		 - Verify repair Go to Step 9
9
  1. Check for proper ignition voltage output with spark tester J 26792 (ST -125). Refer to IGNITION SYSTEM for procedure.
  2. If a problem is found, repair as necessary.
Was a problem found?		 - Verify repair Go to Step 10
10
  1. Remove the spark plugs and check for wet plugs, cracks, wear, improper gap, burned electrodes, or heavy deposits. Refer to IGNITION SYSTEM .
    NOTE: If spark plugs are gas or oil fouled, the cause of the fouling must be determined before replacing the spark plugs.
  2. If a problem is found, repair as necessary.
Was a problem found?		 - Verify repair Go to Step 11
11
  1. Check the ignition coils for cracks or carbon tracking.
  2. If a problem is found, repair as necessary.
Was a problem found?		 - Verify repair Go to Step 12
12
  1. Check the knock control system.
  2. If a problem is found, repair as necessary.
Was a problem found?		 - Verify repair Go to Step 13
13
  1. Check the ECM grounds for cleanliness, tightness and proper locations. Refer to the ENGINE PERFORMANCE in Electrical Diagnosis.
  2. If a problem is found, repair as necessary.
Was a problem found?		 - Verify repair Go to Step 14
14
  1. Check the exhaust system for possible restriction:
    1. Inspect the exhaust system for damaged or collapsed pipes.
    2. Inspect the muffler for heat distress or possible internal failure.
    3. Check for a possible plugged three-way catalytic converter by checking The exhaust system back pressure. Refer to Bank 1 Restricted Exhaust System Check  .
  2. If a problem is found, repair as necessary.
Was a problem found?		 - Verify repair Go to Step 14
15
  1. Check the torque converter clutch (TCC) for proper operation. Refer to TRANSMISSION CONTROL SYSTEM .
  2. If a problem is found, repair as necessary.
Was a problem found?		 - Verify repair Go to Step 16
16
  1. Check for an engine mechanical problem. Check for low compression, incorrect or worn camshaft, loose timing belt, etc. Refer to ENGINE MECHANICAL (6VE1-DI - 3.5L) .
  2. If a problem is found, repair as necessary.
Was a problem found?		 - Verify repair Go to Step 17
17
  1. Review all diagnostic procedures within this table.
  2. If all procedures have been completed and no malfunctions have been found, review/inspect the following:
    1. Visual/physical inspection
    2. Tech 2 data
    3. Freeze Frame data/Failure Records buffer
    4. All electrical connections within a suspected circuit and/or system.
  3. If a problem is found, repair as necessary.
Was a problem found?		 - Verify repair -
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