What you need to know before starting

Replacing spark plugs in a Suzuki Kizashi is a task you can do yourself with basic tools, though the exact steps depend on which engine you have. The Kizashi came with either a 2.0-liter or 2.4-liter four-cylinder engine, and both sit in a tight engine bay that requires you to remove the coil packs first. You will need new spark plugs rated for your model year, a socket set, a ratchet, a spark plug socket (usually 16mm), and a gap tool if you are checking the gap yourself.

The job typically takes 30 minutes to an hour once you understand the layout. Most owners find it straightforward, though the coil packs sit close together and the spark plug wells are deep, so patience matters more than strength. If you are uncomfortable working in an engine bay or if your Kizashi is still under warranty, a dealer or independent shop can do this for you in under an hour.

Key Takeaways

  • Suzuki Kizashi spark plugs sit under coil packs that must be removed first, and the engine bay is tight enough that you should disconnect the negative battery terminal before starting.
  • You need a 16mm spark plug socket, a ratchet, and a socket set to reach the plugs; the wells are deep, so a magnetic socket helps prevent dropping plugs into the engine.
  • Most Kizashi models use either Denso or NGK spark plugs, and your owner's manual or parts retailer can confirm the exact part number and gap setting for your year.
  • Coil packs should be inspected for cracks or corrosion while they are out, and you should replace them if you see damage, since they often fail around the same time as old spark plugs.
  • The job takes 30 minutes to an hour and costs $40 to $80 in parts if you do it yourself, or $150 to $300 at a shop depending on location and whether coil packs need replacement.

Locating the spark plugs under the coil packs

Open your hood and look at the top of the engine. You will see four thick black cylinders arranged in a row — those are the coil packs. Each one sits directly on top of a spark plug. The coil packs are held down by a single bolt each, and they have a connector clip on the side that snaps onto a wiring harness. Do not pull on the wires themselves; always grip the connector body and twist gently to release it.

Before you touch anything, disconnect the negative terminal of your battery. This is a safety step that prevents accidental grounding and protects your vehicle's electrical system. Locate the negative terminal (marked with a minus sign or black cable) on your battery, loosen the nut with a wrench, and slide the cable off. You do not need to remove the entire terminal — just disconnect it.

Once the battery is disconnected, remove the coil pack connectors one at a time. Twist the connector gently side to side while pulling straight out. Then remove the bolt holding each coil pack down using a socket wrench. Keep the bolts in a safe place — they are small and straightforward to lose. Lift each coil pack straight up and set it aside on a clean surface where it will not get damaged.

Removing the old spark plugs

With the coil packs out of the way, you can now see the spark plug wells. Insert your 16mm spark plug socket onto your ratchet and lower it into the well. The socket should fit snugly over the spark plug's ceramic insulator. Turn the ratchet counterclockwise to loosen the plug, then unscrew it by hand once it is loose enough to grip.

As you pull each plug out, look at its condition. A normal plug is tan or light gray. If it is black and sooty, your engine is running too rich. If it is white or blistered, it is running too hot. These observations do not change what you do next — you still replace it — but they can tell you if something else needs attention later. Write down what you see so you can mention it to a mechanic if problems develop.

Before you install the new plugs, check the gap. The gap is the space between the center electrode and the ground electrode at the tip of the plug. Your owner's manual or the parts box will tell you what the gap should be — typically 0.028 to 0.032 inches for a Kizashi, but confirm this for your year. Use a gap tool (a small wire gauge) to measure and adjust if needed. Most new plugs come pre-gapped, but it is worth checking.

Installing new spark plugs and reconnecting coil packs

Thread the new spark plug into the well by hand first. This prevents cross-threading, which happens when the plug goes in at an angle and damages the threads in the cylinder head. Once it is hand-tight, use your ratchet and spark plug socket to tighten it snugly — firm, but not so tight that you risk stripping the threads. A typical torque spec for a Kizashi is around 18 foot-pounds, but hand-tight is close enough if you do not have a torque wrench.

Repeat this process for all four plugs. Once all plugs are in, reinstall the coil packs. Lower each one straight down onto its plug, then hand-thread the bolt to hold it in place. Tighten the bolt with your socket wrench — these bolts are usually around 10 foot-pounds, so snug but not forceful. Then reconnect the coil pack connectors by pushing them straight in until you hear or feel a click.

After all four coil packs are back in place and connected, reconnect the negative battery terminal. Tighten the nut by hand until it is snug, then give it a quarter turn more with a wrench. Do not over-tighten — you just need a solid connection. Close your hood and start the engine. It should start normally. If the check engine light comes on, do not panic; sometimes it takes a few drive cycles to clear. If it stays on after a week of normal driving, have the code read at a shop.

Choosing the right spark plugs for your Kizashi

Suzuki Kizashi models typically use either Denso or NGK spark plugs, depending on the year and market. Your owner's manual will list the exact part number, or you can call a Suzuki dealer with your vehicle identification number (VIN) and they will tell you which plug your car needs. Do not assume all Kizashi models use the same plug — they do not.

You have three main choices: OEM (original equipment manufacturer) plugs from Suzuki, name-brand replacements like Denso or NGK, or budget alternatives. OEM plugs are the safest choice if cost is not a concern. Name-brand plugs from Denso or NGK are reliable and cost less. Budget plugs are cheaper still but may not last as long. Most owners find that mid-range plugs offer the best balance of cost and longevity.

Spark plugs typically last 30,000 to 100,000 miles depending on the type. Standard copper plugs last around 30,000 miles. Iridium or platinum plugs last much longer — often 60,000 to 100,000 miles — but cost more upfront. If you plan to keep your Kizashi for many more years, iridium plugs may save you money in the long run because you will replace them less often.

Inspecting coil packs while they are out

While your coil packs are removed, take a moment to inspect them. Look for cracks in the plastic body, corrosion on the metal contacts, or oil leaking from the base. Coil packs often fail around the same time spark plugs wear out, so if you see any damage, replacing them now will save you from a breakdown later.

If a coil pack looks fine, you can reinstall it. If you see cracks, corrosion, or oil, you should replace it. A single coil pack costs $40 to $100 depending on whether you buy OEM or aftermarket. If you replace all four at once, you might pay $150 to $300 total, but many owners only replace the damaged ones and leave the rest alone.

Common mistakes to avoid

The most common mistake is pulling on the spark plug wires instead of the connector. The wires are fragile and can tear, which creates a poor connection and causes misfires. Always grip the connector body itself and twist gently. Another mistake is over-tightening the spark plugs or coil pack bolts. These threads are in aluminum, which strips easily. Snug is enough.

A third mistake is forgetting to disconnect the battery. While it is not strictly dangerous, it can trigger fault codes or damage sensitive electronics. A fourth mistake is installing plugs without checking the gap, especially if you bought older stock or plugs from an unfamiliar source. Five minutes with a gap tool prevents a rough-running engine. Finally, do not mix up the coil packs or connectors. Each one goes back where it came from. If you are worried about confusion, label them with tape before you remove them.

When to take your Kizashi to a shop

If your engine bay is too tight for you to work comfortably, or if you do not have the right tools, a shop can do this job quickly and affordably. Independent shops typically charge $150 to $250 for spark plug replacement, while Suzuki dealers charge $200 to $300. If coil packs need replacement too, add $50 to $100 per pack.

You should also consider a shop visit if you are uncomfortable working on your car, if your Kizashi is still under warranty and you want to keep it that way, or if you notice other problems while the coil packs are out — like oil leaks or damaged wires. A mechanic can spot issues you might miss and address them before they become expensive.

Frequently Asked Questions

How often should I replace spark plugs in a Suzuki Kizashi?

Check your owner's manual for the recommended interval, which varies by year and plug type. Standard copper plugs typically need replacement every 30,000 miles. Iridium or platinum plugs last 60,000 to 100,000 miles. Many owners replace them when the check engine light comes on or when they notice rough idling or poor fuel economy.

Can I replace just one spark plug, or do I need to do all four?

You can replace just one if only one is bad, but most mechanics recommend replacing all four at the same time. They wear at similar rates, and replacing them together ensures consistent performance. The labor cost is the same whether you replace one or four, so doing all four is usually more economical.

What does it mean if my check engine light comes on after I replace the spark plugs?

A check engine light after spark plug replacement usually means a coil pack connector was not seated fully, or a plug was not tightened enough. Turn off the engine, check that all connectors are clicked in firmly, and verify that all plugs are snug. Restart and drive for a few miles. If the light stays on, have the code read at a shop to see which cylinder is misfiring.

Do I need to replace the coil packs when I replace the spark plugs?

Not necessarily. Inspect them while they are out. If they look clean and undamaged, reinstall them. If you see cracks, corrosion, or oil, replace them. Many owners replace coil packs only when they fail, not as routine maintenance, so do not feel obligated to replace them just because the plugs are out.

What is the gap, and why does it matter?

The gap is the space between the electrodes at the tip of the spark plug. If the gap is too small, the spark may not jump reliably. If it is too large, the ignition system has to work harder and may not fire at all. Your owner's manual specifies the correct gap for your Kizashi. Most new plugs come pre-gapped, but checking takes two minutes and prevents a rough-running engine.