Troubleshooting Car Vibration The Three Types Of Driveline Vibration}

Filed Under (Cars) by 4Wct7D on 05-03-2017

Troubleshooting Car Vibration – The Three Types of Driveline Vibration

by

Keith Farren

There are several different possible causes for a driveline vibration. Your wheels, tires, axles, driveshaft, transmission, clutch or torque converter and engine components are all rotating at a high rate of speed, and any one or more of these components can create a vibration if they are worn or out of spec. Worn or broken engine or transmission mounts can transmit normal vibrations that usually aren’t ever felt, and accidental body contact with the engine, transmission, or exhaust can also be misinterpreted as a driveline vibration. The first step in diagnosing a classic car vibration is to determine exactly when and under what conditions the vibration occurs.

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There are three basic types of vibrations:

1. Engine RPM related – If the vibration is related to engine RPM, it will occur in all gears (and possibly even sitting still) at a particular engine RPM or above. This vibration usually can be attributed to the engine itself or anything else that turns at the same speed as the engine, such as the harmonic balancer, flywheel or flexplate, pilot bearing, pressure plate, torque converter, or transmission input shaft. It is also possible for body contact with the engine, transmission, or exhaust to cause an engine RPM related vibration. Worn or broken engine or transmission mounts can contribute to this problem. When driving the vehicle with the vibration present, maintain vehicle speed and try shifting to a lower or higher gear. If the vibration changes or goes away while maintaining the same vehicle speed, then the problem is not related to engine RPM.

2. Vehicle Speed related – If the vibration is related to vehicle speed, it will not be present until you reach a certain speed, and then it will usually start gradually and then become worse as speed increases. In some cases, it will decrease at some point, and then come back again at a higher speed. This type of vibration could be related to your wheels, tires, axles, differential, driveshaft runout, balance, or angles, universal joints, or transmission output shaft. Try the same driving test as above. If the vibration is present in third gear at 50 mph, but shifting to fourth gear at 50 MPH makes the vibration go away, then it is not going to be vehicle speed related and you can usually rule out any rotating component that is further back than the transmission output shaft. At a given MPH, your output shaft, driveshaft, axles, wheels and tires are all turning at a constant speed, no matter what gear the transmission is in.

3. Accel/Decel/Cruise related – A vibration that changes depending on whether you are accelerating, decelerating, or cruising at a steady speed could have quite a few different causes. Generally, this will be related to driveshaft angles or a worn or broken part, instead of something being out of balance. Think about what changes when the engine is under load. The engine and isolator mount loads shift; the load on the pinion bearing changes; your driveshaft angles change, possibly more than they should due to a broken engine or transmission mount; your exhaust, shifter, transmission, etc. could be contacting the body only on accel or decel; if the car has been lowered (or raised), your suspension snubbers could be contacting the body prematurely.

A vehicle works as a system, and you have to understand the relationships between all the different parts when you are trying to diagnose a driveline vibration. Determining if the vibration is related to engine speed, vehicle speed, or engine load will help you narrow down the list of possible culprits, and keep you from wasting your time looking in the wrong places.

Having good information is one of the first steps of diagnosing and repairing an automotive problem. Take a look at my page on

Auto Repair Information

, and then visit my directory of

Classic Car Repair Resources

.

Keith Farren is an ASE Master Tech with an Associate degree in Automotive Technology and twenty years experience in the auto industry.

Article Source:

Troubleshooting Car Vibration – The Three Types of Driveline Vibration

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Used Car Dealers How To Find Cheap Cars To Resell For A Profit}

Filed Under (Cars) by 4Wct7D on 12-01-2017

Used Car Dealers How to Find Cheap Cars to Resell for a Profit

by

Adnan Masood

Are you a new used car dealer who wants to expand your inventory? If so, you need cheap vehicles that you can resell for a profit. Sounds easy enough, but how should you get started?

Auto Auctions: It is no secret that most used car dealers get their inventory from auctions. You should have lots of auctions to choose from. For instance, you might find a general auto auction in your immediate area and then have a dealer auction (where only dealers are allowed to bid). The only downsides are the transportation issues and the fact that there are no guarantees. You might walk away with no cheap vehicles to resell or twenty of them, but do you have a plan to get them back to your dealership lot?

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Online: There are a number of car buying websites online. However, these listings are typically posted by dealers just like you. It might be within your best interest to focus your attention on classified websites or marketplaces online. You should be able to find some cheap for sale by owner vehicles that you can buy and then resell for profits. You will encounter some sellers asking the suggested value as outlined in the Kelley Blue Book. This doesnt leave much profit room, but remember that you are a used car salesperson who was born to negotiate so do it!

Trade-ins: Some used car dealers like to stay away from trade-ins because it does tend to decrease profits, but not if you handle them right. To protect your business, your finances, and your inventory, dont accept all trade-ins; ensure it is in good shape. Also consider issues that you can fix. Lets say that you also double as an auto mechanic or have a repair shop onsite. A car that needs new brakes, new wheel bearings, and a new headlight might not be an ideal pick for a car buyer, but you can offer a low trade-in value, repair the car, and resell it for a profit!

As you can see, you as a dealer have a number of options when it comes to stocking your dealership lot. If you decide to utilize the internet, consider using a desktop car finder. They lets you search thousands of websites at once. These sites tend to include car buying sites, classifieds, and more! You can save time, save money in the long-run, and eliminate hassle.

Try the

Car Finder

free for 7-days. Search thousands of websites for cheap cars to resell for a profit.

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Used Car Dealers How to Find Cheap Cars to Resell for a Profit
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