Definition: Momentary lack of response as the accelerator is pushed down. Can occur at all vehicle speeds. Usually most severe when first trying to make the vehicle move, as from a stop sign. May cause engine to stall if severe enough.

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

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Go to Step 2

Go to

Powertrain On Board Diagnostic (OBD) System Check

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?

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Go to Step 16

Go to Step 3

Perform the careful visual/physical checks as described at the start of Symptoms section.

Is the action complete?

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Go to Step 4

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1. Check the TP sensor for binding or sticking. Voltage should increase at a steady rate as the throttle is moved toward Wide Open Throttle.
2. Repair if malfunctioning.

Was a problem found?

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Go to Step 16

Go to Step 5

1. Check the MAP sensor for proper operation. Refer to Manifold Absolute Pressure Sensor Output Diagnosis .
2. Repair if malfunctioning

Was a problem found?

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Go to Step 16

Go to Step 6

1. Check for fouled spark plugs.
2. Replace the spark plugs if malfunctioning.

Was a problem found?

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Go to Step 7

1. Check the Ignition Control Module for proper grounds.
2. Repair if grounds are malfunctioning.

Was problem found?

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Go to Step 8

1. Check for poor fuel pressure. Refer to Fuel System Diagnosis .
2. If a problem is found, repair as necessary.

Was a problem found?

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Go to Step 9

1. Check for contaminated fuel.
2. If a problem is found, repair as necessary.

Was a problem found?

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Go to Step 16

Go to Step 10

1. Perform the Fuel Injector Solenoid Coil Test or Fuel Injector Balance Test .
2. If a problem is found, repair as necessary.

Was a problem found?

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Go to Step 16

Go to Step 11

1. Check for proper system performance. Use Table Evaporative Emission Control System Diagnosis
2. If a problem is found, repair as necessary.

Was a problem found?

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Go to Step 16

Go to Step 12

1. Check for proper function of the thermostat. Also check for proper heat range.
2. If a problem is found, repair as necessary.

Was a problem found?

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Go to Step 16

Go to Step 13

1. Check the generator for proper output voltage. The generator output voltage should be between the specified values.
2. If a problem is found, repair as necessary.

Was a problem found?

11V-16V

Go to Step 16

Go to Step 14

1. Check the intake valves for valve deposits.
2. If deposits are found, remove as necessary.

Were deposits found on the intake valves?

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Go to Step 16

Go to Step 15

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 items:

•	Visual/physical inspection.

•	Scan tool data.

•	All electrical connections within a suspected circuit and/or system.

3. If a problem is found, repair as necessary.

Was a problem found?

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Go to Step 16

Check for Service Bulletins

Operate vehicle within the conditions under which the original symptom was noted.

Does the system now operate properly?

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System OK

Go to Step 2