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Toyota Supra (MK4) Ignition FAQ's

Please read our FAQs page to find out more.

What plugs should I run on a higher‑boost 2JZ?

A one‑step‑colder iridium plug gapped to your tuner’s spec helps resist blowout. Recheck gap after a few heat cycles on new builds.

Are coil upgrades useful on older MK4s?

Fresh coils or upgraded units improve spark energy and stability at higher cylinder pressures. Pair with proper dwell settings in the tune.

Misfire only under boost on a MK4—where do I start?

Verify plug gap and age, inspect coils and boots, smoke‑test for small leaks, and confirm fuel quality and timing targets in the calibration.