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.
Computerized Engine Controls: COMPUVALVE
The compuvalve consists of a metering valve assembly, sensors and AFCM. Compuvalve meters fuel electronically according to engine load and calculates spark advance for driveability and emissions. Compuvalve uses signals from several input devices and also controls output signals to various actuators. See INPUT DEVICES and OUTPUT SIGNALS . Input sensors are used to monitor engine performance and signal compuvalve to select correct combination of injectors to deliver alternative fuel flow and also alternative fuel mass. Correct alternative fuel mass is delivered through a low pressure hose, into fuel rails and injector sleeves. Compuvalve calculates alternative fuel mass every spark event.
Compuvalve also incorporates a Fuel Absolute Pressure (FAP) sensor, Fuel Rail Temperature (FRT) sensor and a Manifold Absolute Pressure (MAP) sensor. When in ALT fuel mode, compuvalve will substitute gasoline fuel gauge level signal with a signal from fuel tank pressure sensor, located on the high pressure regulator (CNG), or from fuel level float sensor, located in Liquefied Petroleum Gas (LPG) fuel tank. This allows compuvalve to send a CNG fuel level signal or LPG fuel level signal to gasoline fuel gauge.
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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.