Simple Fixing for Your McLaren Spark Plugs | GVE London – Blog

A recurring issue reported by McLaren owners is misfiring or having a rough idle. Sometimes, the reason is a worn spark plug or failing coil packs. Thankfully, it is a simple fix. Even if you’re opting to go to a local car service centre for your McLaren servicing, it is helpful to know what they’re actually doing, so let’s discuss that in this blog.

Diagnosing the Problem

Misfires, hard starting, reduced power, or fluctuating RPM at idle often point to spark plug wear or failing coils. Owners report that all plugs and coils on these cars should be replaced as a pair for consistency.

On some models, especially the 720S Spider or 570S, accessing the plugs can be tricky. You might need to remove engine cover panels, intake plenums, and even rear fender trims. It’s doable but fiddly.

Tools and Materials Needed

You’ll need:

I) Spark plug socket and ratchet

II) Extension bars or wobble adapters

III) Torque wrench (to factory spec)

IV) New OEM spark plugs and coil packs if needed

V) Dielectric grease and anti-seize compound

VI) Protective gloves and clean clothes

Step 1: Prepare the Vehicle

Park the car, turn off the engine, and let it cool down. Disconnect the battery because you don’t want to get zapped, needless to say.  Remove the engine cover and intake plenum for access. Some models may require the removal of rear quarter panels or under-tray sections.

Step 2: Remove Old Spark Plugs and Coils

Unplug each ignition coil. Remove the retaining bolt. Gently pull the coil pack. Fit the spark plug socket and extension to reach deep plugs. Unscrew carefully—they’re sensitive to torque and thread.

Work slowly so you don’t drop tools into the engine bay.

Read Also: McLaren Servicing Myths That Could Be Costing You Money

Step 3: Inspect and Fit New Parts

Check if the old plugs have taken any damage and replace them if needed. Many owners change both coils and plugs for the best results, but you can change whatever actually needs replacing, too.

Step 4: Reassemble and Test

Reconnect the ignition coils, wiring harness, and the battery. Refit the panels and engine covers and fire it up. If the idle is smooth, you’re on the right track. Accelerate gently and ensure no faults recur. If misfires remain, get a diagnostic scan at a service centre.

Step 5: Professional Support When Needed

The job can be rather complex, and there is no shame in admitting that. The plugs are hard to reach, too. So, in case you think you’d rather have a specialist take care of it, contact a car servicing centre London capable of McLaren servicing.

What You’ll Notice After the Fix

I) Smoother idle without rough RPM or stalling

II) Sharper throttle response and consistent power delivery

III) Reduced engine noise and decreased hesitation under acceleration

Your car just feels more alive again. Best part? You may avoid more costly work down the line.

Conclusion

A spark plug and coil pack refresh at the right time does wonders for your McLaren. However, if the task seems out of your DIY spectrum, it is best to contact a trusted car service centre in Uxbridge or London, specialising in McLaren servicing, such as GVE London. Furthermore, being enthusiasts, we not only perform the usual repairs and service but can work on customisation, window tints and detailing as well. To know more, hop on a call with us today!