Minor vibration
Thread Starter
|
Elder User
Joined: Jun 2003
Posts: 642
Likes: 0
From: Bay Area, CA
Originally posted by buzzard
Vibration in the steering wheel, brake pedal, gas pedal....?
Vibrations are hard to speculate on. It could be powertrain, drivetrain, wheels, tires, alignment, etc.
Vibration in the steering wheel, brake pedal, gas pedal....?
Vibrations are hard to speculate on. It could be powertrain, drivetrain, wheels, tires, alignment, etc.
Thanks
Logistics Pro
Joined: Oct 2000
Posts: 3,960
Likes: 5
From: All over Texas
Here's a bit of info on a piece of equipment Ford should use to help locate your vibration:
Vibration Analyzer (VA)
The VA is a hand-held electronic diagnostic tool which will assist in locating the source of unacceptable vibrations. The vibration sensor can be remotely mounted anywhere in the vehicle for testing purposes. The unit displays the three most common vibration frequencies and their corresponding amplitudes simultaneously. A bar graph provides a visual reference of the relative signal strength (amplitude ) of each vibration being displayed and its relative G force. The keypad is arranged to make the VA simple to program and use. Some of the functions include the ability to average readings as well as record, play back and freeze readings. The VA has a strobe balancing function that can be used to detect imbalance on rotating components such as a driveshaft or engine accessories.
The VA allows for a systematic collection of information that is necessary to accurately diagnose and repair NVH problems. For the best results, carry out the test as follows:
a. Test drive the vehicle with the vibration sensor inside the vehicle.
b. Place the sensor in the vehicle according to feel.
— If the condition is felt through the steering wheel, the source is most likely in the front of the vehicle.
— A vibration that is felt in the seat or floor only will most likely be found in the driveline, drive axle or rear wheels and tires.
c. Record the readings. Also note when the condition begins, when it reaches maximum intensity, and if it tends to diminish above/below a certain speed.
— Frequencies should be read in the "avg" mode.
— Frequencies have a range of plus or minus 2. A reading of 10 Hz can be displayed as an 8 Hz through 12 Hz.
d. Determine what the normal frequency is for the vehicle at a specified speed. Multiply the rear axle ratio by the Hz (1 Hz per every 5 mph). Example: A vehicle travelling 50 mph with a 3.08 rear axle ratio, the acceptable amount of Hz for the vehicle at that speed would be 10 (1 Hz per every 5 mph) X 3.08 (rear axle ratio) = 30.8 Hz.
e. Place the vibration sensor on or near the suspect area outside the vehicle.
f. Continue the road test, driving the vehicle at the speed the symptom occurs, and take another reading.
g. Compare the readings.
— A match in frequency indicates the problem component or area.
— An unmatched test could indicate the concern is caused by the engine, torque converter, or engine accessory. Use the VA in the rpm mode and check if concern is rpm related.
— Example: A vibration is felt in the seat. Place the sensor on the console. Record the readings. Place the vibration sensor on the rear axle. Compare the readings. If the frequencies are the same, the axle is the problem component. Also refer to the following chart as a reference to acceptable vibration and noise ranges for the specified components.
Vibration Analyzer (VA)
The VA is a hand-held electronic diagnostic tool which will assist in locating the source of unacceptable vibrations. The vibration sensor can be remotely mounted anywhere in the vehicle for testing purposes. The unit displays the three most common vibration frequencies and their corresponding amplitudes simultaneously. A bar graph provides a visual reference of the relative signal strength (amplitude ) of each vibration being displayed and its relative G force. The keypad is arranged to make the VA simple to program and use. Some of the functions include the ability to average readings as well as record, play back and freeze readings. The VA has a strobe balancing function that can be used to detect imbalance on rotating components such as a driveshaft or engine accessories.
The VA allows for a systematic collection of information that is necessary to accurately diagnose and repair NVH problems. For the best results, carry out the test as follows:
a. Test drive the vehicle with the vibration sensor inside the vehicle.
b. Place the sensor in the vehicle according to feel.
— If the condition is felt through the steering wheel, the source is most likely in the front of the vehicle.
— A vibration that is felt in the seat or floor only will most likely be found in the driveline, drive axle or rear wheels and tires.
c. Record the readings. Also note when the condition begins, when it reaches maximum intensity, and if it tends to diminish above/below a certain speed.
— Frequencies should be read in the "avg" mode.
— Frequencies have a range of plus or minus 2. A reading of 10 Hz can be displayed as an 8 Hz through 12 Hz.
d. Determine what the normal frequency is for the vehicle at a specified speed. Multiply the rear axle ratio by the Hz (1 Hz per every 5 mph). Example: A vehicle travelling 50 mph with a 3.08 rear axle ratio, the acceptable amount of Hz for the vehicle at that speed would be 10 (1 Hz per every 5 mph) X 3.08 (rear axle ratio) = 30.8 Hz.
e. Place the vibration sensor on or near the suspect area outside the vehicle.
f. Continue the road test, driving the vehicle at the speed the symptom occurs, and take another reading.
g. Compare the readings.
— A match in frequency indicates the problem component or area.
— An unmatched test could indicate the concern is caused by the engine, torque converter, or engine accessory. Use the VA in the rpm mode and check if concern is rpm related.
— Example: A vibration is felt in the seat. Place the sensor on the console. Record the readings. Place the vibration sensor on the rear axle. Compare the readings. If the frequencies are the same, the axle is the problem component. Also refer to the following chart as a reference to acceptable vibration and noise ranges for the specified components.
