Which resource should be consulted for ignition timing procedures if not found on the under-hood label?

• A. A generic repair manual
• B. Emissions Control Application guide or the manufacturer's service manual
• C. Internet forum
• D. Dealer's catalog

Answer: (B)

When ignition timing procedures aren’t shown on the under-hood label, use the official sources tailored to your vehicle. The Emissions Control Application guide or the manufacturer's service manual provide the exact, model-specific steps for setting timing, including how to reference points, vacuum/advance considerations, and any updates or bulletins. They’re kept current and align with emissions requirements and engine control expectations, ensuring the procedure won’t cause drivability or legal issues.

A generic repair manual can be too broad and may not reflect vehicle-specific calibrations or the latest emissions guidance. An internet forum might offer tips, but those are not authoritative and can be outdated or incorrect. A dealer’s catalog is about parts and service offerings, not the official step-by-step timing procedure.