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.
Ignition Systems: Notes
If engine cranks but does not run or immediately stalls, perform appropriate ENGINE CRANKS BUT WILL NOT RUNtesting procedure under NO START DIAGNOSIS in BASIC DIAGNOSTIC PROCEDURES article. Engine cranks but will not run diagnostic procedure will determine if problem is in the ignition or fuel systems. If any DTC are stored, see related DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article. If misfire is being experienced and no DTCs are stored, see MISFIRE MONITOR DIAGNOSIS .
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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.
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