EMP Spark Plug Lead Wire, 9 Inch, Single Wire, Replaces Sierra 18-5231-1, for Evinrude Outboard Motors

This EMP spark plug lead wire is a 9 inch single-wire ignition lead designed as a direct replacement for Sierra 18-5231-1 on Evinrude outboard motors. It carries the ignition spark from the coil to the spark plug, and a worn, cracked, or corroded lead wire is a common cause of misfires, hard starting, and rough idle on older outboards. Replacing the lead wire with a correctly sized, single-wire EMP part restores a clean, reliable spark path without disturbing the rest of the ignition harness.

Because this is a single wire (not a full harness), it is intended for applications where only one spark plug lead needs replacement, keeping the repair targeted and the cost down compared to swapping an entire wire set. It is built to the same length and configuration as the Sierra 18-5231-1 it replaces, so it installs in place of the original routing without modification.

Specifications

• Brand: EMP
• Manufacturer Part Number: 84-03022
• Product Type: Spark Plug Lead Wire
• Length: 9 inches
• Number of Wires: 1
• Weight: 0.09 pounds
• Replaces: Sierra 18-5231-1

Fitment

• Evinrude outboard motors

Replaces (OEM)

• 18-5231-1

Frequently Asked Questions

What does the EMP 84-03022 spark plug lead wire fit? The EMP 84-03022 is designed for Evinrude outboard motors and is built as a direct replacement for Sierra 18-5231-1.

How long is this spark plug wire? It measures 9 inches, matching the length of the Sierra 18-5231-1 it replaces.

Is this a single wire or a full wire set? This EMP part, 84-03022, is a single spark plug lead wire, not a multi-wire harness, so it is meant for replacing one lead at a time.

Does 84-03022 cross-reference to a Sierra part number? Yes, EMP 84-03022 replaces Sierra 18-5231-1 and can be used anywhere that Sierra number is called for.

How much does the EMP 84-03022 spark plug wire weigh? It weighs 0.09 pounds.

Will this work if my old wire is cracked or corroded? A cracked or corroded spark plug lead is exactly what the EMP 84-03022 is meant to replace, restoring a clean connection between the coil and spark plug.

Is the EMP 84-03022 an OEM part or aftermarket? The 84-03022 is an EMP aftermarket spark plug lead wire built to replace Sierra 18-5231-1.

Can I use this wire on a different engine brand? The EMP 84-03022 is specified for Evinrude outboard motors; no other engine brand fitment is listed for this part.

What symptoms indicate I need to replace this spark plug wire? Misfires, hard starting, and rough idle on an Evinrude outboard can point to a failing spark plug lead, which the EMP 84-03022 is designed to correct.

Does the EMP 84-03022 come as a complete replacement, ready to install? Yes, the EMP 84-03022 is a complete 9 inch single spark plug lead wire ready to install in place of Sierra 18-5231-1.