484Q-18-100-T
Amplify electricity: Transforms the car’s 12V low voltage into 20,000–30,000V high voltage—enough to create a strong spark at the spark plug.
Sync with engine timing: Receives signals from the S7’s ECU to fire the spark plug at the exact right moment (during the engine’s compression stroke)—ensuring efficient fuel combustion, smooth engine running, and optimal power.
Good fits: Every Haima S7 model that comes with the 484Q engine. It lines up with the spark plug size, talks to the S7’s ECU (that’s the engine’s “brain”) the right way, and locks onto the cylinder head perfectly. Pro tip: Always check your VIN to make sure it’s a match.
Haima S7 with other engines: If your S7 has a different engine (not the 484Q), the spark plugs are different, and the ECU won’t “understand” this coil. It’ll just sit there doing nothing—or worse, causing problems.
Other Haima models: Things like the S5, M6, or F7? Nope. Their engines are built differently, the coil mounts in the wrong spot, and they need a different voltage. This coil won’t work for them.
Cars that aren’t Haima: Even if it looks like it might fit another brand? Don’t do it. Other cars’ ECUs and spark plugs are totally different—you’ll end up with engine misfires or even electrical damage.
Get ready: Turn off your S7’s engine and let it cool down. Hot engine bays burn, so don’t rush this! Pop the hood, then find the ignition coils—they’re right on top of the engine, sitting over the spark plugs, and each has a little wiring plug.
Take out the old coil: Unplug the wiring plug first (just press the small tab to release it). Then use a socket wrench or screwdriver to take out the tiny bolt holding the coil to the cylinder head. Gently pull the coil straight up—don’t yank it—and it’ll come off the spark plug.
Put in the new coil: Slide the new 484Q-18-100-T coil right over the spark plug. Make sure the rubber “boot” at the bottom fits snugly. Tighten the small bolt back up—but don’t crank it too hard! You could strip the threads, and that’s a pain. Then plug the wiring back in until you hear a click.
Test it out: Start your S7’s engine. Listen for weird shakes (that’s misfiring), check if it idles rough, or if any warning lights pop up. If it runs smooth? You’re good to go. If you’re replacing more than one coil, do one at a time—so you don’t mix up the wires.
Look for damage once a year: Give the coil a once-over. If you see cracks in the hard plastic (that’s the epoxy resin), frayed wires, or oil on the rubber spark plug boot? Replace it fast. Oil on the boot means the seal’s broken, and that’ll ruin the coil.
Watch for misfires: If your S7 starts shaking, loses power, or uses way more gas than usual? A bad ignition coil is probably to blame. You can test it with a multimeter (they’re cheap!) or just take it to a shop to check.
Replace it with spark plugs: Ignition coils and spark plugs wear out around the same time—usually every 60,000 to 100,000 km. Swap them both out at the same time, and your engine will run way better.
Keep water away: Don’t spray the engine bay with high-pressure water! Water can seep into the coil and short it out—then you’ll be stuck with a dead coil.
Prep: Turn off the engine, let it cool, then locate the coil (on top of the engine, over spark plugs with a wiring plug).
Remove old coil: Unplug the wiring (press the tab), remove the small mounting bolt, and pull the coil straight up.
Install new coil: Slide it over the spark plug (ensure the rubber boot fits snugly), tighten the bolt gently (avoid stripping threads), then reattach the wiring until it clicks.
Test: Start the engine—check for misfires, rough idling, or warning lights. Replace one coil at a time if swapping multiple to avoid wire mix-ups.
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