To replace spark plugs in a Toyota Supra, let the engine cool, remove the engine cover and the ignition coils, unscrew the old plugs with a spark plug socket, check the gap on the new plugs, fit them to the torque in the service manual, and refit the coils. The plug type, gap and interval differ by engine, so use your owner’s manual. Related: when to replace spark plugs in a Toyota Supra.
Why Regular Spark Plug Maintenance Is Essential for Your Toyota Supra
Worn plugs can cause misfires, poor economy and harder starting. Replace them at the interval in your owner’s manual.
Essential Tools for Spark Plug Replacement
- Spark plug socket with a rubber insert (size per your plug)
- Torque wrench
- Extension and ratchet
- Gap tool, if the plugs need gapping
- The correct plugs for your engine
Checking and Gapping Spark Plugs: A Quick Guide
Check the gap against the figure in the manual. Many modern plugs are pre-gapped, and bending iridium electrodes can damage them, so be gentle or leave them alone.
How to Replace Spark Plugs in a Toyota Supra
- Let the engine cool and remove the engine cover.
- Disconnect the coil connector and remove the coil bolt.
- Pull the coil straight up.
- Blow debris out of the plug well.
- Unscrew the old plug.
Installing New Spark Plugs: Tips for Success
Start the new plug by hand to avoid cross-threading, then tighten it with the torque wrench to the specification in the manual.
Safely Reinstall Ignition Coils to Prevent Damage
Refit each coil firmly, tighten the bolt to specification and reconnect the connector. Do the job one cylinder at a time to avoid mix-ups.
Avoid These Common Spark Plug Replacement Mistakes
- Cross-threading the plug.
- Over-tightening.
- Dropping debris into the cylinder.
- Using the wrong plug.
How to Reset the Oil Maintenance Reminder After Replacement
Plug replacement does not normally need a reminder reset. If your car has a service reminder, follow the manual to reset it after the service.
Frequently Asked Questions
How Do You Change Spark Plugs Step by Step?
Remove the cover and coils, unscrew the old plugs, fit new plugs to the right torque, and refit the coils.
How Much Does It Cost to Replace Spark Plugs in a Supra?
Costs vary with the plugs and labor rates, so ask a shop for a quote.
How to Replace Spark Plugs in Toyota?
The process is similar on most Toyotas with coil-on-plug engines, but always use the manual for your model.
Do I Need to Check the Gap on New Toyota Spark Plugs?
Check it against the manual, since pre-gapped plugs can be knocked out of spec. Handle iridium plugs gently.
Conclusion
Use the right plugs, tighten to the specification, and take care with the coils.
