ACDelco Spark Plug CR43TS (19354425) — OE Replacement, Copper Core & Corrosion-Resistant

ACDelco GM Original Equipment CR43TS (19354425) is a conventional copper-core spark plug engineered to deliver reliable ignition performance and factory-fit replacement for compatible GM and other vehicles.

This CR43TS plug is built to the engineering standards validated by General Motors and provided through ACDelco’s OE line. It combines a high-conductivity copper core, corrosion-resistant coatings, and a ribbed suppressor seal to reduce misfires and deliver consistent performance across everyday driving and marine use. The design emphasizes fit, heat control, and suppression characteristics important for maintaining smooth engine operation and dependable starts.

How does the CR43TS maintain ignition reliability under normal driving?

The plug uses a copper core for fast heat transfer and a nickel-chrome sheathing on the center electrode to resist corrosion. A ribbed suppressor seal minimizes spark "flash over," helping prevent misfires and interference with electronics. These elements work together to keep spark timing stable and combustion consistent under routine conditions.

• Copper core for efficient heat dissipation and consistent firing
• Nickel-chrome electrode sheathing to reduce corrosion over time
• Ribbed suppressor seal reduces misfires and radio interference
• Black Onyx coating helps resist rust and external corrosion

What makes this an OE-level replacement for GM vehicles?

ACDelco GM Original Equipment parts are designed, engineered, and tested to meet General Motors’ standards, and many are validated by GM engineers for specific Chevrolet, Buick, GMC, and Cadillac models. The CR43TS matches the form, fit, and functional characteristics expected from production-installed units, simplifying maintenance and preserving OEM tolerances.

• Engineered to GM specifications and validated by GM where applicable
• Manufactured for consistent dimensions and thread fit
• Materials and coatings align with OE performance expectations
• Often replaces formerly labeled GM Genuine Parts or ACDelco Professional items

Can I use the CR43TS in marine or non-automotive applications?

Yes — this spark plug is offered for select marine applications as well as standard automotive engines. The corrosion-resistant coatings and durable electrode construction make it suitable where exposure to moisture and salt air increase corrosion risk. Always confirm the correct part number and heat range for your engine before installing in a marine environment.

• Available variants specified for marine use where listed
• Black Onyx coating improves corrosion resistance in humid environments
• Verify part number and heat range compatibility for your application
• Follow manufacturer service intervals for marine installations

How do I know when to replace this spark plug and what maintenance matters?

Replace plugs according to your vehicle or engine manufacturer’s service schedule, or sooner if you notice hard starts, engine misfires, unusual fuel consumption, or visible electrode wear. Proper gapping and torque at installation preserve performance, and checking for carbon or oil fouling helps diagnose related engine issues that simple replacement won’t fix.

• Follow OEM service interval or vehicle owner’s guide for replacement timing
• Inspect electrode and insulator for wear, deposits, or damage
• Set correct gap and torque to manufacturer specifications during installation
• Address engine issues (oil leaks, rich running) that foul plugs prematurely

Who is this for: The ACDelco CR43TS (19354425) is intended for drivers and technicians seeking a factory-style, dependable conventional spark plug for GM vehicles and other compatible engines, plus owners of boats or equipment that require corrosion-resistant OE-grade replacements. It suits anyone who wants a straightforward, well-specified plug with proven materials — copper core for heat control, suppression features to reduce misfires, and coatings that help extend service life.