Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Kia Soul X LineFACTORY OEM SERVICE PROCEDURE
Spark Plug: Troubleshooting
| Symptom | Suspect Area | Remedy |
|---|---|---|
| Engine will not start or is hard to start (Cranks OK) | Ignition lock switch | Inspect ignition lock switch, or replace as required |
| Ignition coil | Inspect ignition coil, or replace as required | |
| Spark plugs | Inspect spark plugs, or replace as required | |
| Ignition wiring disconnected or broken | Repair wiring, or replace as required | |
| Rough idle or stalls | Ignition wiring | Repair wiring, or replace as required |
| Ignition coil | Inspect ignition coil, or replace as required | |
| Engine hesitates/poor acceleration | Spark plugs and spark plug cables | Inspect spark plugs/cable, or replace as required |
| Ignition wiring | Repair wiring, or replace as required | |
| Poor mileage | Spark plugs and spark plug cables | Inspect spark plugs/cable, or replace as required |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.