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Car Wont Start But Battery is Good

All About Auto

If a car won’t start the first thing that will come to our mind is a problem with the battery, but it’s not only the battery that makes the car start but it is also the car starting system as a whole.

The starting system cranks the engine. The car starting system generally uses a DC motor that operates on electric energy from a battery. The motor rotates when the ignition switch is turned on (ST position).

The turning force of the starter motor is delivered through its pinion gear to the flywheel ring gear that is attached to the crankshaft. When starting the engine, a large amount of torque is required to compress the air-fuel mixture in the engine cylinders and overcome the engine’s oil viscous resistance and other loads. Therefore, a large current (150A to 200A) must flow through the starter motor, and consequently, the battery must be fully charged.

The reason why the car won't start but the battery is good

(1) Problem with the timing belt.
(2) Problem with the starter.
(3 ) Problem with the Battery connection

Car Troubleshooting

If the car won't start but the battery is good, it might be a battery connection, starter, or timing belt problem. Here is what you do to verify.

The first thing to check is the battery, open the hood, and locate the battery. Using a multi-tester check the battery voltage, the battery voltage should be at least 12.4 V, if the battery voltage is good next to check is the battery condition. Check the battery terminal if there is a presence of a cruddy-like substance on the battery terminals, if there is a presence of this substance, then that is the reason why the car won't start, it is because that substance prevents the flow of current from the battery to the starter. Now if the terminal is in good condition and the battery is good and works fine then the battery is not the problem.
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If the engine turns normally by cranking, then the possible problem is the ignition system or the fuel system. Check these two items. However, if the engine turns slowly than normal then the problem is somewhere in the battery, check the battery charging condition, the connection of the terminal, and the corrosion.

If the engine does not turn by cranking, observed the starter motor. If the starter motor turn, observe if the gear shaft also turns if the gear shaft turns check the starter pinion clutch. If the gear shaft does not turn check the reduction gear, armature, and gear shaft.

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Now, if the starter motor does not turn, check the fuse and the fusible link. If the fusible link is not ok to replace it, if the fusible link is ok and the battery condition and connection are good, check the starting system wiring.

If the starting system is ok, observe if the magnetic switch operation sound occurs, if there is no sound replace the magnetic switch.

If there is a sound, check the condition of the pinion and ring gear mesh, adjust the pinion movement, check the pinion mechanism, and check the ring gear.

If the condition of the pinion and ring gear mesh is good, test the starter under no-load by connecting it directly to the battery without connection to the magnetic switch, if the starter turn then the problem is the magnetic switch, if it will not turn then the problem is the starter.

If the car won't start but the battery is good, check the timing belt. The car won't start but the battery works well while starting it just turn over and will not start but the car turns over a lot faster than normal. If the battery works fine the possible reason why the car won't start is the timing belt.

Now start the car, if the car turns over faster than normal then this is an indication of a problem that has something to do with the timing belt. The function of the timing belt is to make sure the valves in each cylinder are closed during the combustion inside the engine cylinder, it is necessary to provide compression. If the timing belt is not functioning properly and has a problem like if the belt is broken, there will be no compression inside the engine during the compression stroke and will cause the car not to start.

A car that is not starting with a good battery usually a broken timing belt or lack of compression is the main reason.

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What to do?

Bring the car to a reputable car repair shop and ask the mechanic to check the timing belt and replace the timing belt if necessary. But, if you want to fix it yourself, just refer to the service manual covering the particular model of your car. The works involved in fixing this problem involves a very big job so make sure you have the best price available when doing or selecting a car repair shop.

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1 comment:

  1. The phrase "turning over" refers to the car transitioning from the starter motor crank phase to the engine running. The quick, repetitive noise that comes from a car when you turn the key when in the on position is called the "crank", referring to the electric starter motor "cranking" the motor to initiate ignition.

    The phrase "turning over" does not refer to the crank, and is a typical misuse, leading to confusion.

    Another cause of a car not starting with a good battery and a noise that could be considered a "fast crank" is a failing starter motor. The "fast crank" will sometimes never turn over no matter how many times it cranks, and continuous cranking in this state will lead to further starter motor damage. An easy way to get a car running with a bad starter requires a medium straight pry bar or "crowbar", a small hammer and a second person. Find the starter motor in the engine bay. Place the pry end of the pry bar or crowbar on the starter motor and LIGHTLY tap the other end with the hammer. Simultaneously, have a second person crank the engine. Nine times out of ten, a bad starter motor will be failing due to small pieces which look like teeth falling off, and tapping the starter motor while cranking allows the motor to find a good "tooth" and produce proper charge to initiate a good electric cycle, and will start the car. This condition will only worsen with time so timely repair is essential.


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