Symptoms
Shaking at a stoplight, stumbling under acceleration, or a flashing check engine light are the most common signs.
Replacement interval
Copper plugs: 20,000–30,000 miles. Platinum and iridium: 60,000–100,000+. Check your manual.
Coils go too
On coil-on-plug engines, a failing ignition coil causes the same symptoms. We test both.
Get it fixed by a mobile mechanic
Matt Mobile Mechanic of Austin handles this at your home anywhere around Austin:
Popular areas: Austin, Round Rock, Pflugerville, Cedar Park, Leander, Georgetown
Frequently Asked Questions
Can I replace plugs at home?
We can — it's a common mobile tune-up.
Do bad plugs hurt fuel economy?
Yes, misfires waste fuel.
How long does it take?
1–2 hours on most 4-cylinders, longer on some V6s.