Troubleshooting assistant

Pick a problem area, choose the symptom, then follow the remedy links or step-by-step TSRM procedure.

Areas /Engine backfires

Engine Mechanical

Engine backfires

Backfire symptoms.

Step-by-step guide available. Use this when the remedy table sends you to a troubleshooting procedure.

Start guide

Possible causes and remedies

Possible cause

Vacuum leak
• PCV hoses
• EGR valve
• Intake manifold
• Air intake chamber
• Throttle body
• ISC valve

Remedy

Check hoses and repair as necessary

Possible cause

Pulling in air between air flow meter and throttle body

Remedy

Repair as necessary

Possible cause

EFI system problem

Remedy

Repair as necessary

Possible cause

Insufficient fuel flow

Remedy

Troubleshoot fuel system

FI-70

Possible cause

Incorrect ignition timing

Remedy

Reset timing

IG-20

Possible cause

Carbon deposits in combustion chambers

Remedy

Inspect cylinder head

EM-32