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.
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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 69 (ENGINE CONTROLS - THEORY & OPERATION - 2.2L)FUEL SYSTEMS - CNGFUEL SYSTEM OPERATION - CNGNOTES
2001 Chevrolet Cavalier LS, 2.4 T
Fuel System Operation - CNG: Notes
2001 Chevrolet Cavalier LS, 2.4 TSECTION Notes
WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
This vehicles primary fuel source is Compressed Natural Gas (CNG). The vehicle will only switch-over to gasoline operation if one of the following conditions is present:
- The Fuel Tank Pressure (FTP) sensor indicates CNG fuel pressure is below 200 psi (1379 kPa).
- Every 100th start the vehicle will start and run briefly on gasoline. After this, a switch-over to CNG will occur during the first decel condition.
- A system fault is detected by the PCM.
- The engine cranks for 8 seconds and fails to start on CNG.
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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.