How to Diagnose Automobile Problems
Driving an automobile daily causes wear to the parts. Your automobile will have problems during ownership, but diagnosing automobile problems is an easy task. Most often, diagnosing automobile problems is a process of elimination. Using the correct methods to diagnose a problem will save you both time and resources.
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Instructions
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Attempt to locate the automobile problem. Notice odd sounds, smells or ways the automobile operates while you are driving it. Pay attention to anything that is unusual or problems that recently appeared.
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Look for basic solutions to the problem. Check the oil level if the car is running sluggish. Check the transmission fluid if the gears are shifting hard. Check the water level in the battery if the lights start to dim. If the windshield wipers are noisy, check to see they are not loose or the wiper blades are not worn down. If the brakes are soft, check the brake fluid. Take the tire off each wheel and visually inspect the brake pads to check for damage or wear.
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Check the tires for proper air pressure. Underinflated or overinflated tires can cause the automobile to pull to one side. This can also cause alignment problems and wear on the wheel bearings and brakes. If the tires are in good shape, go to the next step.
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Place the car in neutral while holding the steering wheel and your foot on the brake. Move the steering wheel in either direction until you feel pressure against you while moving it. The wheel should only have about 2 inches of play in either direction before pressure is encountered. If the wheel moves without resistance, this could mean a problem with alignment as well.
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Drive the car normally for a day to see if the problem persists or returns. Check for leaks under the car if this occurs. Check for holes in the exhaust pipe or loose wiring. Fix any leaks you find, or replace any loose wiring. Damaged pipe or connectors can also be easily replaced. If none of the above steps help diagnose the automobile problem, proceed to the next step.
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Locate the vehicle information. This should normally be on a sticker on the inside of the driver's-side door near the door lock. You will need the year, make and model of the automobile to locate exact specifications for diagnosis and repair.
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Locate the correct repair manual for your automobile using the make, model and year as a reference. Repair manuals can be found online and usually cost $25 to $29. The three biggest suppliers of repair manuals are Chilton's, Haynes and HP Books. References to there sites are listed below.
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Look through the manual for your specific problem. The information in these manuals is informative enough to diagnose most common problems. You will also find a tools and parts list. The manuals will also tell you when a problem may need a qualified mechanic. Once you have diagnosed the problem, look over the information on fixing the problem and decide if you are capable and willing to handle the repair.
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