90-823225--1 10965E-132 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
BACKFIRE (EXHAUST)
Definition: Fuel ignites in the manifold, making a loud popping noise.
PRELIMINARY CHECKS
Perform the important preliminary checks as described at the start of the “Troubleshooting” section.
CHECK FUEL SYSTEM FOR:
1. An abnormal fuel system condition: If necessary perform fuel system diagnosis.
2. Proper functioning of fuel injectors.
CHECK IGNITION SYSTEM FOR:
1. Opens and grounds in CKTs 423, 424 and 430.
2. Properly functioning (advancing and retarding of timing) Ignition Control (IC).
3. Proper output voltage of ignition coil.
4. Faulty or corroded spark plug wires and boots.
5. Faulty spark plugs.
CHECK ENGINE FOR:
1. Possible sticking or leaking valves.
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