Parts for your 1998 Nissan Pulsar-Spark plugs

1998 Nissan Pulsar Spark Plugs — What they do and when to replace

Referencing the Nissan Pulsar N15 Series Factory Service Manual (1995–2000), the owner’s maintenance schedule, and AU/NZ plug catalogues from NGK, the 1998 Pulsar’s petrol engines (GA16DE 1.6L and SR20DE 2.0L) are fitted with spark plugs and specify a typical 1.1 mm gap. Only diesel variants (rare in this market and using CD20) run glow plugs instead. For most Australian and New Zealand 1998 Pulsars, spark plugs are absolutely relevant and part of routine servicing.

On a 1998 Nissan Pulsar, spark plugs fire the air–fuel mix so the engine lights up cleanly every time. Good plugs keep cold starts drama-free, help fuel economy, and make throttle response feel honest. When they’re tired, drivers often notice rough idle, a flat spot under load, or the fuel gauge dropping a bit faster than it should.

This Pulsar generation commonly runs a 1.1 mm plug gap per the factory manual and AU/NZ plug catalogues, with copper, platinum, or iridium options available. Copper plugs deliver solid value but like more frequent changes, platinum and iridium last longer and tend to hold their gap better over big kilometres.

As a rule of thumb for AU/NZ conditions:

• Copper/nickel plugs: inspect every 20,000–30,000 km, replace around 30,000–40,000 km.
• Platinum/iridium plugs: inspect at 50,000–80,000 km, replace about 100,000–160,000 km (follow the manual and the plug maker’s guidance).

When servicing spark plugs on a 1998 Pulsar, check the condition of the leads or coil setup (varies by engine/trim), look for oil in the plug wells, and verify the gap if the plug type allows it. Tighten to the manufacturer’s torque spec on the aluminium head, as a practical guide, many M14 gasketed plugs land around 18–25 N·m. If a torque wrench isn’t handy, seat the new plug finger-tight, then turn about a half-turn to crush the washer (or a small additional nip if reusing a washer). Modern plugs are typically nickel-plated, so anti-seize isn’t recommended by most plug makers, and it can lead to over-tightening.

Fresh plugs help the GA16DE and SR20DE engines run sweet as, especially if the Pulsar’s doing lots of short trips. Combine them with a clean air filter and healthy ignition components, and the little Nissan will feel more eager and use less petrol.

Popular questions about 1998 Nissan Pulsar spark plugs

What spark plug type and gap does a 1998 Nissan Pulsar use?
Most AU/NZ 1998 Pulsar petrol engines (GA16DE 1.6 and SR20DE 2.0) use standard 14 mm gasketed plugs gapped to 1.1 mm, as noted in the N15 service manual and local plug catalogues. The exact material (copper, platinum, iridium) is owner preference or trim-dependent. It’s best to confirm on the under-bonnet label or owner’s manual.

How often should the spark plugs be replaced?
Copper plugs are typically replaced around 30,000–40,000 km, while platinum or iridium options can stretch toward 100,000–160,000 km. Always follow the maintenance schedule and the plug manufacturer’s recommendations, and inspect sooner if there are misfires, poor economy, or hard starts.

What are the signs the plugs need attention?
Tell-tales include rough idle, sluggish acceleration, increased fuel use, and hard starting. On inspection, look for worn electrodes, heavy deposits, oil fouling, or cracked insulators. If the leads or coil components are tired, the car can show similar symptoms, so check those too.