Road Test Quick Check Results

1. 24-80 km/h (15-50 mph): With light acceleration, a moaning noise is heard, and possibly a vibration is felt in the floorpan. It is usually worse at a particular engine speed and at a particular throttle setting. It may also produce a moaning sound.

Refer to Pinpoint Test B. B: Idle Boom/Shake/Vibration

2. High Speed: With slow acceleration and deceleration, a shake is sometimes noticed in the steering wheel/steering column tube, seats, floorpan, trim panels or front end sheet metal. It is a low frequency vibration. It may or may not be increased by applying brakes lightly.

Refer to Pinpoint Test A. A: Tip-In Moan

3. High Speed: A vibration is felt in the floorpan or seats with no visible shake, but with an accompanying sound, rumble, buzz, hum, drone or booming noise. Coast with transaxle in NEUTRAL and engine idling. If vibration is still evident, refer to Pinpoint Test A to diagnose the following possible concerns:
- Wheels.
- Tires.
- Front disc brake rotors.
- Rear brake drums.
- Wheel hubs.
- Wheel bearings.

4. High Speed: A vibration is felt whenever the engine reaches a particular rpm. It will disappear during NEUTRAL coast. The vibration can be duplicated by operating the engine at the problem rpm while the vehicle is parked. It can be caused by any number of components.

Refer to Pinpoint Test D. D: Non-Axle Noise