How Often to Change Spark Plugs in the Kia Soul Exclaim Turbo

The Kia Soul Exclaim Turbo combines compact practicality with turbocharged performance, making reliable spark plugs crucial for optimal power, fuel economy, and emissions. Proper maintenance includes following the recommended spark plug interval, inspecting plugs for wear, and understanding how driving conditions can affect longevity. This article covers interval guidelines, signs of wear, plug type considerations, and a practical replacement approach tailored to the Kia Soul Exclaim Turbo.

Recommended Spark Plug Intervals For The Kia Soul Exclaim Turbo

For modern turbocharged engines like the Kia Soul Exclaim Turbo, spark plug life depends largely on the plug type and driving conditions. Typical intervals are:

Iridium or platinum plugs: Often rated for 90,000 to 105,000 miles under normal driving, with turbo engines occasionally benefiting from closer inspection as mileage progresses.
Copper or conventional plugs: Commonly require replacement every 30,000 to 60,000 miles, especially if the engine is turbocharged or experiences high-load driving.

Automotive manufacturers may publish exact intervals in the owner’s manual or maintenance schedule. For the Kia Soul Exclaim Turbo, users should verify the official specification for their exact model year, but many engines in this family align with the higher end of the interval range when using high-quality iridium or platinum plugs.

Factors That Influence Spark Plug Longevity

Several factors can shorten or extend plug life in a turbocharged setup:

Turbocharger usage: Frequent high-boost driving creates hotter combustion, accelerating electrode wear.
Air-fuel quality: Lean or rich mixtures can cause overheating or fouling, respectively, leading to misfires or deposits.
Ignition system health: Faulty coils, wires, or coil-on-plug packs can cause misfires that accelerate plug wear.
Oil consumption or leaks: Oil deposits on plugs reduce heat transfer and accelerate wear.
Driving style: Short trips, frequent idling, and low-speed stop-and-go traffic can reduce an otherwise long plug life.

Symptoms Of Worn Spark Plugs

Recognizing worn plugs helps prevent misfires and performance loss. Common symptoms include:

Rough idling or misfires, especially under load or at idle.
Reduced acceleration or sluggish throttle response.
Decreased fuel economy and potential increase in emissions.
Difficulty starting or a rough start in cold weather.
Comparator wear such as worn electrodes or heavy fouling when inspected.

Choosing The Right Spark Plug Type For The Kia Soul Exclaim Turbo

Most turbocharged Kia engines, including the Soul Exclaim Turbo, benefit from long-life iridium or platinum plugs. These materials provide superior wear resistance and maintain a consistent gap over a longer period. When replacing plugs, use OEM-recommended heat range and gap settings. Avoid gap changes unless specified by the manufacturer or a qualified technician, as incorrect gaps can affect combustion and misfire risk.

How To Inspect Spark Plugs Before Replacing

If approaching the mileage interval or experiencing symptoms, a quick inspection can confirm the need for replacement. Steps include:

Disconnect the ignition coil or remove the spark plug boot to access the plug.
Remove the plug with a spark plug socket and torque wrench to avoid over-tightening.
Check electrode condition: Look for worn electrodes, excessive eroded tips, oil fouling, or heavy carbon buildup.
Check gaps against the OEM specification; if reusing plugs, gaps should be within tolerance.
Inspect sealing surfaces on the cylinder head for damage or debris after removal.

Replacement Procedure: A Practical Guide

Replacing spark plugs on the Kia Soul Exclaim Turbo is a moderately straightforward maintenance task for those with basic tools. A typical procedure includes:

Gather tools and parts: Correct spark plugs (iridium/platinum as recommended), a torque wrench, a spark plug socket, extension, and anti-seize/grease if recommended by the plug manufacturer.
Cool engine and remove coils: Allow the engine to cool, then unplug electrical connectors and detach coil packs as needed to access each plug.
Remove old plugs: Use the proper socket and extension to extract each plug without cross-threading.
Check new plugs: Verify the correct type, heat range, and gap. Some plugs come pre-gapped; others require adjustment.
Install new plugs with a light coating of anti-seize or torque-approved lubricant if specified, and tighten to the OEM torque setting. Common torque for many modern engines is around 12–20 Nm (11–18 in-lbs) for smaller plugs, but verify for the Soul Exclaim Turbo.
Reassemble ignition components and reconnect any sensors, coils, and electrical connectors.

Torque Specs And Gapping: Quick Reference

Correct torque and gap are essential for reliable starts and efficient combustion. While exact figures vary by model year and plug type, typical ranges are:

Torque: 12–22 Nm (11–19 in-lbs) for many modern turbo engines; always consult the owner’s manual or a dealership for the exact spec.
Plug gap: Commonly 0.028–0.040 inches (0.7–1.0 mm) depending on the engine, with iridium/platinum plugs often shipped pre-gapped.

Maintenance Frequency And Driving Conditions

To maximize performance and minimize cost, align replacement with driving patterns:

Normal daily driving typically reaches the upper end of the interval if iridium/platinum plugs are used.
Aggressive driving or frequent high-load operation may shorten life, suggesting earlier inspection or replacement.
Severe driving—short trips, cold starts, or towing—often warrants more frequent checks, potentially every 30,000 to 60,000 miles for non-long-life plugs.

Impact On Performance And Fuel Economy

Fresh spark plugs restore optimal combustion, improving throttle response, acceleration, and efficiency. Worn plugs can cause misfires, reduced power, and poorer fuel economy, especially in a turbocharged system where precise ignition timing matters. Regular replacement helps maintain smooth engine operation and reduces emissions, aligning with standard maintenance expectations for the Kia Soul Exclaim Turbo.

Common Mistakes To Avoid

Using the wrong plug type or heat range which can cause misfires or overheating.
Over-tightening or under-tightening plugs, risking thread damage or poor sealing.
Forgetting to gap or torque correctly, especially on plug replacement with pre-gapped units.
Neglecting coils and boots during replacement, potentially masking ignition faults.

When To Seek Professional Help

If there is uncertainty about the correct procedure, torque specification, or if the engine shows persistent misfires after replacement, a qualified technician should be consulted. A service professional can perform a compression test, verify ignition system health, and ensure there are no related mechanical issues.