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
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