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⚙️⚙️ENGINE NOISE. ⚙️⚙️
In the modern era, engine are designed to almost be totally unheard whilst running. Therefore, any slight noise indicates a malfunction.
SOURCES OF ENGINE NOISE

1) MISFIRING or BACKFIRING.
POSSIBLE CAUSES.
- Fuel in tank has wrong octane/cetane number, or is wrong type of fuel.
- Ignition system faulty.
- Engine temperature too high.
- Carbon deposits in the combustion chamber start to glow and cause misfiring.
- Timing incorrect, which causes misfiring in the intake/ exhaust system.

REQUIRED ACTION
- Determine which type of fuel was last put in the tank.
- Check the ignition system
- Check the engine cooling system
- Remove the carbon deposits by using fuel additives and driving the vehicle carefully
- Check the timing

2) VALVE TRAIN FAULTY.
POSSIBLE CAUSES.
- Valve clearance too large due to faulty bucket tappets or incorrect adjustment of valve clearance.
- Valve timing incorrectly adjusted valves and pistons are touching.
- Timing belt broken or damaged.

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GUIDE TO IDENTIFYING AND TACKLING COMMON STARTUP SOUNDS:
Have you ever heard a strange noise when you turn the key to start your car? Maybe it sounds like grinding griiiiii,kikikiki, kimkim, clicking, whining, or squealing. These noises are not normal at all and they could indicate a problem with your engine or starter motor. If you ignore them, you could end up with a damaged engine or a car that won’t start at all. That’s why it’s important to understand what causes these noises and how to fix them.
this article, I take enough time to explain the common causes of cranking noise, how to identify the source of the noise, how you can be able to fix the problem, and how to prevent it from happening again. By following this guide, you will be able to maintain a healthy vehicle and avoid costly repairs.
All I want you to do right now is to sit tight ,read and digest every lines of this article because it might savr your ass someday and also you will know exactly what is wrong with your car before your mechanic will tell you some lies just to make you pay him more than you budgeted.
COMMON CAUSES OF CRANKING NOISES IN YOUR CAR:
Cranking noise is the sound that your engine makes when you try to start it. It should be smooth and consistent, but sometimes it can be loud and irregular. This could mean that something is wrong with one or more of the following components:
(1):STARTER MOTOR:
The starter motor is a small electric motor that spins the engine to start it. It has a solenoid, which is a switch that sends power to the motor, and a bendix gear, which is a large metal wheel that connects the motor to the engine. If the starter motor is worn out, the solenoid is faulty, or the bendix is damaged, you may hear a grinding, clicking, or whirring noise when you crank the engine.
(2):BATTERY:
The battery is a device that stores electrical energy and provides power to the starter motor and other electrical systems. If the battery is weak or dead, it may not have enough power to crank the engine properly. This can cause a slow cranking or a clicking noise when you turn the key.
(3):ENGINE LUBRICATION :
The engine lubrication system is responsible for keeping the engine parts well-oiled and smooth. It consists of oil, oil pump, oil filter, and oil passages. If the oil level is low or the oil is dirty, the engine parts may not get enough lubrication and friction may increase. This can cause a knocking or grinding noise when you crank the engine.
(4): ACCESSORY BELT:
The accessory belt is a rubber belt that drives various components in the engine, such as the alternator, power steering pump, and air conditioning compressor. If the belt is loose or worn, it may slip or squeak when the engine is cranked. This can cause a squealing or whining noise during startup.
OTHER POTENTIAL CAUSES:
There are some less common causes of cranking noise that may involve faulty ignition components, such as spark plugs, wires, or coils, or internal engine problems, such as broken pistons, valves, or rods. These can cause various noises, such as popping, rattling, or clunking, when you crank the engine.
IDENTIFYING THE SOURCE OF NOISE:
To find out what is causing the cranking noise, you need to listen carefully and observe the symptoms. Here are some tips on how to differentiate between different types of noises:
(1):GRINDING NOISE:
A grinding noise is usually caused by a problem with the starter motor and the flywheel not gearing properly. It sounds like metal scraping against metal. It may happen intermittently or continuously. It may also affect the performance of the engine, such as causing hard starting, stalling, or misfiring
(2):CLICKING NOISE:
A clicking noise is usually caused by a problem with the battery or the solenoid. It sounds like a rapid or repeated clicking sound. It may happen once or several times. It may also prevent the engine from starting at all, or cause the lights and other electrical systems to dim or flicker.
(3):WHINING NOISE:
A whining noise is usually caused by a problem with the accessory belt or the alternator. It sounds like a high-pitched or squeaky sound. It may happen only when the engine is cold or all the time. It may also affect the charging of the battery, the steering of the vehicle, or the cooling of the engine.
(4):KNOCKING NOISE:
A knocking noise is usually caused by a problem with the engine lubrication or the internal engine parts. It sounds like a heavy or dull thumping sound. It may happen only when the engine is cold or all the time. It may also affect the performance of the engine, such as causing loss of power, overheating, or smoking.
In addition to listening to the noise, you should also inspect the relevant components for signs of wear or damage. For example, you can check the starter motor for cracks, corrosion, or loose connections, the battery for leaks, cracks, or low voltage, the oil for level, color, and quality, and the belt for cracks, tears, or looseness.
If you are still unsure of the cause of the noise, or if the noise persists after you fix the obvious problem, you should consult a mechanic for professional diagnosis. A mechanic can use specialized tools and equipment to test the components and find the exact source of the noise.
FIXING THE PROBLEM:
Once you identify the cause of the cranking noise, you need to fix it as soon as possible to avoid further damage or inconvenience. Depending on the cause, the fix may involve replacing, repairing, or adjusting the component. Here are some potential repairs for each common cause:
(1):STARTER MOTOR ISSUES:
If the starter motor is the problem, you may need to replace the whole unit or just the solenoid or the bendix gear. The cost of replacing the starter motor can range from $200 to $600, depending on the make and model of your vehicle. The cost of replacing the solenoid or the bendix can be lower, but it may require more labor and time.
(2):BATTERY PROBLEMS:
If the battery is the problem, you may need to recharge it, replace it, or clean the terminals and cables. The cost of recharging the battery can be free or minimal, depending on where you do it. The cost of replacing the battery can range from $50 to $200, depending on the type and quality of the battery. The cost of cleaning the terminals and cables can be minimal, but it may require some tools and skills.
(3):ENGINE LUBRICATION ISSUES:
If the engine lubrication is the problem, you may need to change the oil, replace the oil filter, or repair the oil pump or the bearings. The cost of changing the oil and the filter can range from $20 to $100, depending on the type and quality of the oil and the filter. The cost of repairing the oil pump or the bearings can be higher, depending on the extent of the damage and the labor involved.
(4):ASSESSORY BELT ISSUES:
If the accessory belt is the problem, you may need to tighten it, replace it, or replace the tensioner or the pulley. The cost of tightening the belt can be minimal, but it may require some tools and skills. The cost of replacing the belt can range from $30 to $200, depending on the type and quality of the belt. The cost of replacing the tensioner or the pulley can be higher, depending on the make and model of your vehicle and the labor involved.
OTHER POTENTIAL ISSUES:
Other potential causes: If the problem is caused by something else, such as faulty ignition components or internal engine problems, the repair may vary widely, depending on the specific component and the extent of the damage. The cost of repairing these problems can range from $100 to $1000 or more, depending on the part and the labor involved.
By fixing the problem promptly, you can prevent further damage to your engine or starter motor, improve the performance and reliability of your vehicle, and save money on future repairs.
PREVENTIVE MEASURES:
To prevent cranking noise from happening again, you need to take good care of your engine and starter motor. Here are some tips on how to maintain a healthy vehicle and minimize the risk of cranking noise:
(1):CHECK YOUR BATTERY REGULARLY :
You should check your battery every few months or before a long trip. You can use a voltmeter to measure the voltage of the battery and make sure it is above 12.6 volts.
You can also look for signs of leaks, cracks, or corrosion on the battery and the terminals. If you notice any problems, you should replace or clean the battery as soon as possible.
(2): CHANGE YOUR OIL REGULARLY :
You should change your oil every 3,000 to 5,000 miles or according to the manufacturer’s recommendation. You should also check your oil level and quality every month or before a long trip. You can use a dipstick to measure the oil level and make sure it is between the minimum and maximum marks. You can also look at the color and consistency of the oil and make sure it is not too dark, thick, or dirty. If you notice any problems, you should change or top up the oil as soon as possible.
(3): INSPECT YOUR BELT REGULARLY:
You should inspect your belt every 6,000 to 10,000 miles or according to the manufacturer’s recommendation. You should look for signs of cracks, tears, or looseness on the belt and make sure it is not slipping or squeaking. If you notice any problems, you should tighten or replace the belt as soon as possible.
(4): GET YOUR VEHICLE SERVICED REGULARLY:
You should get your vehicle serviced by a mechanic at least once a year or according to the manufacturer’s recommendation. A mechanic can check and test all the components of your engine and starter motor and make sure they are working properly. A mechanic can also spot and fix any potential problems before they become serious and cause cranking noise.
IN CONCLUSION:
Cranking noise is a common problem that many car owners face. It can indicate a problem with your engine or starter motor that could affect the performance and reliability of your vehicle. By understanding the common causes of cranking noise, how to identify the source of the noise, how to fix the problem, and how to prevent it from happening again, you can maintain a healthy vehicle and avoid costly repairs.

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Increasing fuel economy

1) Tire pressures: Remember to increase inflation pressures when vehicle is loaded to capacity(savings: roughly 5 %)

2)Accelerate at wide throttle openings and low engine speeds, upshift at 2000 rpm

3)Drive in the highest possible gear: even at engine speeds below 2000 rpm it is possible to apply full throttle

4)Plan ahead to avoid continuous alternation between braking and acceleration

5)Exploit the potential of the trailing-throttle fuel cutoff

6)Switch off engine during extended stops, such as at traffic lights with extended red phases andat railroad crossings, etc. (3 minutes of idling consumes as much fuel as driving 1 kilometer)

7)Use full-synthetic engine oils (savings of approximately 2 % according to the manufacturer)

Source -Gasoline Engine Management System, BOSCH

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