Parts for your 2004 Ford Falcon-Spark plugs

2004 Ford Falcon spark plugs — what they do and when to change them

According to technical references like the Ford BA Falcon Owner’s Manual (2004) and Australian parts catalogues from NGK and Bosch, every 2004 Ford Falcon (BA series) that runs petrol or factory E-Gas LPG uses spark plugs — including the Barra inline‑six (NA and Turbo) and the Boss V8. So yes, spark plugs are very much part of the servicing picture on this Falcon.

On a BA Falcon, the spark plug’s job is simple but critical: ignite the air–fuel mix cleanly, every time. Fresh, correctly gapped plugs help the Barra or Boss fire up quickly, idle smoothly, pull hard under load, and keep fuel use and emissions in check. They also protect pricey bits like the coil‑on‑plug modules by keeping voltage demands sensible.

Service-wise, it pays to treat spark plugs as routine. A good rule for these Falcons is to inspect at around 30,000 km and plan replacement somewhere between 60,000 and 100,000 km depending on plug type and use. Iridium/platinum plugs typically go longer than standard copper. LPG (E‑Gas) engines are fussier about spark, so many techs in Aus/NZ swap those a bit earlier and run a slightly tighter gap.

• Plug type: quality iridium or platinum plugs suit daily use, copper works fine with shorter intervals.
• Gap guidance: petrol usually around 1.0–1.1 mm, LPG commonly 0.8–0.9 mm. Pre‑gapped iridium plugs shouldn’t be forced wider.
• Torque: fit to Ford spec with a torque wrench, for typical M14 long‑reach plugs in an alloy head, many techs aim around the high‑teens Nm. Don’t overdo it.

Handy checks while you’re there: look for oil in the plug wells (BA rocker cover gaskets can seep), brittle coil boots, or white tracking marks that hint at misfire. Replace perished boots, clean out any oil properly, and avoid anti‑seize on modern, plated plugs – it can distort torque readings.

Signs it’s time? Hard starting, a rough idle, misfire under load, flat spots, or a bump in fuel use. Keeping the plugs fresh is a cheap way to keep a BA Falcon feeling crisp, whether it’s a laid‑back six or a rumbling Boss V8.

Popular questions about 2004 Ford Falcon spark plugs

What spark plug type and gap should be used on a 2004 BA Falcon?
For everyday driving, a quality iridium or platinum plug listed for the BA Falcon works well. Petrol engines typically run around a 1.0–1.1 mm gap, factory LPG (E‑Gas) engines often prefer about 0.8–0.9 mm for reliable ignition. Always match the plug code to your exact engine (Barra I6, Turbo, or Boss V8) and follow the manufacturer’s spec on gap if it’s pre‑set.

How often should BA Falcon spark plugs be replaced?
A practical rhythm is inspect at 30,000 km and replace between 60,000 and 100,000 km, depending on plug material and how the car’s used. Iridium/platinum plugs can go longer, LPG engines generally benefit from shorter intervals. If you notice misfires, rough running, or higher fuel use, bring replacement forward.

What symptoms point to worn plugs or coil issues on a BA Falcon?
Common giveaways include rough idle, a stumble under load, harder cold starts, and a noticeable rise in fuel consumption. On the Barra, oil in the plug wells or cracked coil boots can trigger misfires. Sorting plugs and any tired coil boots together usually restores smooth performance.