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.
Spark Control Systems: Description: Notes
American Motors uses 7 spark control devices to assist the ignition system in controlling exhaust emissions. They are the Spark Coolant Temperature Override (CTO) Switch, the Non-Linear Vacuum Regulator (NLVR) Valve, Forward and Reverse delay valves, a Vacuum Solenoid Valve (VSV) and a Thermal Vacuum Spark Control Valve used in conjunction with a Vacuum Spark Control Delay Valve (on 4 cylinder models).
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.