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Diagnostic Information & Procedure: Backfire: 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
  1. Inspect for crossed or crossfiring ignition wires.
  2. Check the ignition system output voltage for all cylinders using a spark tester.
  3. Inspect the spark plugs for excessive wear, burned electrodes, improper gap, or heavy deposits.

Is the problem found?		 - Go to Step 3 Go to Step 4
3 Repair or replace any ignition system components as needed.
Is the repair complete?		 - System OK -
4
  1. Check the fuel system operation.
  2. Check the fuel injectors by performing an injector diagnosis.

Is the problem found?		 - Go to Step 5 Go to Step 6
5 Repair or replace any fuel system components as needed.
Is the repair complete?		 - System OK -
6
  1. Inspect the Exhaust Gas Recirculation (EGR) gasket for a leak or a loose fit.
  2. Check the EGR valve for proper operation.
  3. Inspect the intake manifold and the exhaust manifold for a casting flash.

Is the problem found?		 - Go to Step 7 Go to Step 8
7 Repair or replace any components as needed.
Is the repair complete?		 - System OK -
8
  1. Inspect the timing belt for proper installation and tension.
  2. Check the engine compression.
  3. Inspect the intake manifold gasket and the exhaust manifold gasket for leaks.
  4. Check for sticking or leaking valves.
  5. Repair or replace any components as needed.

Are all checks and corrections complete?		 - System OK -
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