Which of the following is true about the BAR Snap test?

• A. It measures exhaust gas humidity.
• B. It uses a vacuum gauge.
• C. It requires a specific RPM range of 2,000 to 3,000.
• D. It tests the battery condition.

Answer: (C)

The BAR Snap test is designed to check how the engine and exhaust respond to a quick, controlled throttle snap at a specific engine speed. The procedure asks you to quickly raise the engine to about two thousand to three thousand RPM and then let it settle back toward idle. That mid‑range, high‑load condition is where ignition, fuel delivery, and the catalytic converter are actively working, so you can observe whether the emissions spike and then settle normally. This defined RPM window keeps the test repeatable across different vehicles and avoids lugging or overspeeding the engine.

So the true statement is that it requires a specific RPM range of 2,000 to 3,000 because that range provides the proper high‑load condition for a meaningful emissions response. The other options don’t fit because the test doesn’t measure exhaust humidity, doesn’t rely on a vacuum gauge, and isn’t a battery condition check.