{"nhtsa_id":603656,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1999-03-01","date":"1998-12-21","document_id":"982518","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE:GASOLINE","mfr_system":null,"summary":"SOME VEHICLES MAY EXHIBT A CONCERN WITH LIGHT SPARK KNOCK / DETONATION WHILE ACCELERATION IN AMBIENT TEMPERTURES GREATER THAN 32 C (90 F). *YC","document":null,"url":"https://open.wenmarpro.com/bulletins/603656","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"FORD","model":"CROWN VICTORIA","year_from":1998,"year_to":1998,"match":"exact","vehicle_ids":["1998_ford_crown-victoria"]},{"make":"MERCURY","model":"GRAND MARQUIS","year_from":1998,"year_to":1998,"match":"exact","vehicle_ids":["1998_mercury_grand-marquis"]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}