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Book page section 5.2 Spark Timing/EGR Flow explaining EGR-based…
Scanned page from an engine-management reference book, section 5.2 "Spark Timing/EGR Flow," explaining how warm driveaway base spark timing comes from a part-throttle look-up table and how the control module adds advance as EGR begins to flow. Bulleted text notes that EGR-diluted air-fuel mixture burns slower and resists detonation, so timing can be advanced to reduce HC and CO.
5.2 Spark TImIng/EGR Flaw Warm Driveaway base saavk mung is caken ham a perv mmle lock-up more. Timing may be advanced n ma conlml mama is mcswmg low ECT sgna>s. As (he engme wanns, monomer unn ems back me tamperaluve-based limlng an moo As EGR begun: Inow, ma control mime sods advance to ma bass Iimmg: - The zen-minted air-hm mixture lakes rongeno burn. so (he spalk ummg must be advanced - Tns EGH-mlmed alHuel mixlure is less Ilkely xo detonate so the spark Ilmmg can be advanced mancad liming endsla hum xna mixture more oompmely 'oducing HC and co Spatk liming is proportional m EGR llaw mHne move llow me more advance.
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