{"product_id":"autolite-app646-spark-plug","title":"Autolite APP646 Spark Plug","description":"\u003ch2\u003eReliable Ignition with Autolite Double Platinum Spark Plug APP646\u003c\/h2\u003e\u003cp\u003eThe Autolite Double Platinum Spark Plug APP646 is engineered to provide consistent ignition performance for a range of vehicles including Buick, Cadillac, Chrysler, Dodge, Oldsmobile, Plymouth, and Pontiac models. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and engine reliability.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDouble platinum center and ground electrode tips for enhanced durability\u003c\/li\u003e\n\u003cli\u003eTapered ground electrode tip design for improved spark efficiency\u003c\/li\u003e\n\u003cli\u003eNickel ground electrode core material for strength\u003c\/li\u003e\n\u003cli\u003eStud-type electrical terminal for secure connection\u003c\/li\u003e\n\u003cli\u003eFlat seat type with 14.0 mm thread diameter and 0.750 inch reach\u003c\/li\u003e\n\u003cli\u003eCeramic mid-projection insulator for heat resistance\u003c\/li\u003e\n\u003cli\u003eResistor type spark plug to reduce electrical interference\u003c\/li\u003e\n\u003cli\u003ePre-gapped to 0.050 inch (1.30 mm) for optimal ignition\u003c\/li\u003e\n\u003cli\u003eHex size 13\/16 inch (21 mm) for standard installation tools\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Line Overview: Autolite Double Platinum Spark Plug\u003c\/h2\u003e\u003cp\u003eThe Double Platinum Spark Plug line from Autolite features spark plugs with platinum material on both the center and ground electrode tips. This design enhances wear resistance and extends service life compared to conventional spark plugs. The APP646 model benefits from this technology, providing stable ignition and consistent performance across compatible vehicle models.\u003c\/p\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThe APP646 spark plug incorporates a standard center electrode design with a platinum core and tip, paired with a single tapered ground electrode also tipped with platinum. The nickel core ground electrode adds structural integrity, while the ceramic mid-projection insulator ensures effective heat dissipation. The flat seat design and precise thread diameter of 14.0 mm allow for a secure fit in the combustion chamber. Additionally, the resistor built into the plug helps minimize radio frequency interference, supporting vehicle electronics.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBuick models including LeMans and Skylark\u003c\/li\u003e\n\u003cli\u003eCadillac DeVille, Eldorado, and Seville\u003c\/li\u003e\n\u003cli\u003eChrysler Concorde and Intrepid\u003c\/li\u003e\n\u003cli\u003eDodge Caravan, Grand Caravan, and Grand Voyager\u003c\/li\u003e\n\u003cli\u003eOldsmobile Firenza and Cutlass\u003c\/li\u003e\n\u003cli\u003ePlymouth Voyager and Grand Voyager\u003c\/li\u003e\n\u003cli\u003ePontiac Sunbird and Grand Prix\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Issues Addressed by APP646 Spark Plug\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMisfires and rough idling due to worn electrodes\u003c\/li\u003e\n\u003cli\u003eReduced fuel efficiency from inconsistent spark\u003c\/li\u003e\n\u003cli\u003eDifficulty starting engines in compatible Buick, Cadillac, and Dodge vehicles\u003c\/li\u003e\n\u003cli\u003eEngine hesitation or power loss under load\u003c\/li\u003e\n\u003cli\u003eElectrical interference affecting onboard electronics\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eVerify correct spark plug gap of 0.050 inch (1.30 mm) before installation\u003c\/li\u003e\n\u003cli\u003eUse a 13\/16 inch (21 mm) socket wrench for proper torque application\u003c\/li\u003e\n\u003cli\u003eEnsure threads are clean and free of debris to prevent cross-threading\u003c\/li\u003e\n\u003cli\u003eApply anti-seize compound sparingly on threads if recommended by vehicle manufacturer\u003c\/li\u003e\n\u003cli\u003eFollow vehicle-specific torque specifications to avoid damage\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eAutolite manufactures the APP646 spark plug to meet OEM standards for ignition components. The use of platinum materials on both electrodes contributes to extended service life and consistent performance. While specific warranty details may vary, Autolite products typically come with a limited warranty against manufacturing defects. Consult product documentation or vehicle service guidelines for warranty coverage.\u003c\/p\u003e","brand":"Autolite","offers":[{"title":"Default Title","offer_id":43634926321845,"sku":"BBRQ-APP646","price":16.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/AB_APP646_Fro.jpg?v=1774987492","url":"https:\/\/www.partcatalog.com\/products\/autolite-app646-spark-plug","provider":"PartCatalog","version":"1.0","type":"link"}