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Surges or Chuggles: Troubleshooting

TROUBLESHOOTING CHART

Step Action Value(s) Yes No
1 Were the Important Preliminary Checks performed? - Go to Step 2 Go to "IMPORTANT PRELIMINARY CHECKS " in
2 Connect the scan tool to the Data Link Connector (DLC).
Does the Heated Oxygen Sensor 1 (HO2S1) respond quickly to different throttle positions?		 - Go to Step 4 Go to Step 3
3
  1. Check the HO2S1 sensor for silicone or other contaminants from fuel or use of improper Room Temperature Vulcanizing (RTV) sealant.
  2. Replace the contaminated HO2S1 sensor.

Is the repair complete?		 - System OK -
4
  1. Drive the vehicle at the speed of the complaint.
  2. Monitor the Long FT B1 reading using the scan tool.

Is the Long FT B1 reading within the value specified?		 -20 - 25% Go to Step 7 Go to Step 5
5 Is the Long FT B1 reading below the value specified? -20% Go to DTC P0172: Fuel Trim System Rich Go to Step 6
6 Is the long term fuel trim reading above the value specified? 25% Go to DTC P0171: Fuel Trim System Lean -
7 Check the fuel system pressure while the condition exists.
Is the fuel system pressure within specifications?		 379 - 393 kPa (55 - 57 psi) Go to Step 8 Go to Step 17
8 Check the fuel line.
Is the filter dirty or plugged?		 - Go to Step 18 Go to Step 9
9 Perform an injector diagnosis.
Does the injector balance test pinpoint the problem?		 - Go to Step 19 Go to Step 10
10
  1. Check for proper ignition voltage output using a spark tester.
  2. Inspect the spark plugs for cracks, wear, improper gap, burned electrodes, or heavy deposits.

Is the problem found?		 - Go to Step 11 Go to Step 12
11 Repair or replace any ignition system components as needed.
Is the repair complete?		 - System OK -
12
  1. Inspect the Engine Control Module (ECM) grounds to make sure they are clean, tight and in their proper locations.
  2. Inspect the vacuum lines for kinks or leaks.

Is the problem found?		 - Go to Step 13 Go to Step 14
13 Repair the electrical connections or the vacuum lines as needed.
Is the repair complete?		 - System OK -
14 Check the generator output voltage.
Is the generator voltage within the value specified?		 12 - 16 V Go to Step 16 Go to Step 15
15 Repair the generator.
Is the repair complete?		 - System OK -
16
  1. Check for intermittent Exhaust Gas Recirculation (EGR) valve operation.
  2. Check Torque Converter Clutch (TCC) operation.
  3. Repair or replace any components as needed.

Is the repair complete?		 - System OK -
17 Repair the fuel system as needed.
Is the repair complete?		 - System OK -
18 Repair the fuel line.
Is the repair complete?		 - System OK -
19 Replace the leaking or restricted fuel injectors.
Is the repair complete?		 - System OK -
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