Spark Plug Replacement · Hurst, TX
Spark Plug Replacement
Spark plugs wear slowly, so the fuel economy they cost you disappears a little at a time. We replace them on your manufacturer's schedule, and we read the old ones, because a worn plug says a lot about the engine it came out of.
Signs You Need Spark Plug Replacement
A worn plug needs more voltage to fire, and it starts missing under load long before it causes trouble at idle.
- Fuel economy slowly slipping: a widened gap burns the mixture less completely, and the loss is gradual enough to miss.
- Hesitation under hard acceleration: cylinder pressure is highest under load, so that is where a worn plug misfires first.
- Slower, rougher starts: more cranking before the engine catches, especially after the car has sat overnight.
- Oil found in the plug wells: a leaking tube seal or valve cover gasket can soak the coil boot and cause a misfire.
- A coil that has already failed: a worn plug makes the coil work harder, so a new coil on an old plug can fail again.
- The scheduled mileage has arrived: long-life plugs last a long time, but they are not lifetime parts.
What We Do
On some engines this is a short job. On others the rear plugs sit under the intake manifold. Either way, the plugs come out without damaging the threads they sit in.
- Match the plug to the engine. Part number, heat range and gap from the manufacturer's specification. Fine-wire plugs are checked carefully and never gapped by levering on the center electrode.
- Remove them cold. Plugs come out of a cool engine to protect aluminum threads, and debris is blown out of each well first so nothing drops into the cylinder.
- Read the old plugs. Light tan deposits are healthy. Oily black, dry soot or a white blistered tip each point at a different problem, and we show you which you have.
- Torque, seat and check. New plugs are torqued to specification, coil boots inspected for cracks and oil, and misfire counts checked on a drive afterwards.
How We Quote It
We inspect before quoting, because recommending parts from a description is how people end up paying for the wrong ones. Once we know what your vehicle needs, you get a written estimate covering parts and labor.
If we find something extra mid-job, we stop and call you with the measurement and the cost. Nothing gets done without your approval.
Every repair carries a 1, 2 or 3 year warranty, capped at 12,000, 24,000 or 36,000 miles respectively, whichever comes first. Ask us which one covers your repair; it is printed on the invoice either way.
Common Questions
How often should spark plugs be replaced?
Follow your manufacturer's schedule. Long-life iridium and platinum plugs are often rated somewhere around 60,000 to 120,000 miles, while plain copper plugs need changing much sooner.
Should all the plugs be replaced at once?
Yes. They wear at the same rate, and on engines where some plugs are hard to reach, doing them separately means paying for that access twice.
Why does it take longer on some engines?
On many transverse V6 engines the rear plugs sit under the intake manifold, which has to come off to reach them. Some engines are also known for plugs that seize, which means slow, careful removal.
Can worn plugs damage anything else?
Yes. A misfire sends unburned fuel into the catalytic converter, which overheats it, and a worn plug puts extra strain on the ignition coil.
Spark Plug Replacement
Worn plugs cost you fuel economy long before they strand you.
Book Spark Plug Replacement- 1, 2 or 3 year warrantyon every repair
- Walk-ins welcomeno appointment needed
- ASE-certified techsall makes & models
- Quote before worknothing without your approval