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.
Deceleration System: Description
The system is used to reduce emission levels during deceleration. System is composed of deceleration valve (Bosch), air flow sensor, microswitch, deceleration relay, thermocontact, cold cut-out relay, and 2-speed relay. Fuel injection is stopped on deceleration by equalizing pressure on both sides of the air flow sensor. This equalization is accomplished by the deceleration valve, which acts on an auxiliary circuit to the mixture regulator. When pressure is equalized, the fuel metering distributor piston is no longer activated by the air flow sensor plate lever and fuel output to injectors ceases.
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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.