Engine Change Guidelines

ByProStopTestOnly

Engine Change Guidelines

Engine changes continue to present problems and challenges to car owners and technicians. Our recommendation is to rebuild and reinstall the original engine, transmission, and emission control configuration.

When rebuilding an engine, it must be rebuilt to the original equipment specifications. However, if you do decide to change the engine, these guidelines must be observed to ensure that the vehicle will be eligible for smog certification or registration.

Remember, these are guidelines for performing engine changes – not certification procedures. All exhaust emission controlled vehicles with engine changes must be inspected by an official Referee station and must have a Bureau of Automotive Repair (BAR) Referee label affixed to the doorpost.

Remember also, state and federal anti-tampering laws generally prohibit any modification to the vehicle’s original emission control system configuration as certified by the manufacturer. And, Section 3362.1 of the California Code of Regulations prohibits any engine change that degrades the effectiveness of a vehicle’s emission control system.

California Certification

A federal Environmental Protection Agency (EPA) certified (federal or 49-state) engine cannot be used in a vehicle that was originally certified for California.

Certification Standards

Make sure the engine and emission control configuration on exhaust-controlled vehicles are certified to the year of the vehicle or newer, and to the same or a more stringent new vehicle certification standard.

Classification

Don’t mix engine and vehicle classifications which will degrade the emissions certification standards. For example, a heavy-duty engine cannot be installed in a light-duty exhaust-controlled chassis even if they have the same displacement. Non-emissions controlled power plants such as industrial or off-road-use-only engines may not be placed in any exhaust-controlled vehicle.

Computer Controls

If a computer-controlled engine is installed in a non-computerized vehicle, the “CHECK ENGINE” light, the Original Equipment Manufacturer (OEM) diagnostic link, and all sensors, switches, and wiring harnesses needed to make the system fully functional must also be installed.

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