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Diagnostic Information and Procedures: Backfire

DEFINITION: 

Fuel ignites in the intake manifold, or in the exhaust system, making a loud popping noise. 

CAUTION: Before diagnosing the symptom, check service bulletins for updates.
BACKFIRE - DIAGNOSIS PROCEDURE

Step Action Value (s) Yes No
1 Were the Important Preliminary Checks performed? - Go to Step 2. Go to Symptom Diagnosis .
2
  1. Inspect for crossed or crossfiring spark plugs.
  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. Check the engine compression.
  2. Inspect the intake manifold gasket and the exhaust manifold gasket for leaks.
  3. Check for sticking or leaking valves.
  4. Repair or replace any components as needed.

Are all checks and corrections complete?		 - System OK -
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