1. Worn engine bearings
   A woodpecker has made his nest in your engine
2. The exhaust is backfiring
   None of the above

The most likely cause of a knocking sound coming from your engine is worn engine bearings. You should take your car to a mechanic immediately.

1. Oil sump
   Catalytic converter
2. Radiator
   None of the above

Although a smell of sulfur can be many things, the most likely cause is a catalytic converter that is failing.

1. A bird's nest in the engine
   Your vehicles emission system or a for a hole in the exhaust
2. Clean your car of any old food containers, especially under the seat
   None of the above

There could be a number of reasons for these fumes, including a fault with the vehicles emissions system. Or it could even be a hole in your exhaust which allows fumes into the car. Always get it checked out, however.

1. The tires are worn and need to be replaced
   The car needs a new exhaust system
2. There is a problem with the ignition timing
   None of the above

A number of things could cause your car to lose power under normal driving conditions. The first place to check is the ignition timing.

1. The accelerator pedal is working properly
   Air filter
2. Whether your kids are using your car without your knowledge
   None of the above

A dirty air filter means less air is getting into the engine which will not only result in poorer performance but also in a higher fuel consumption

1. The manifold has a leak.
   The battery is going flat
2. A snake has made your engine its home
   None of the above

A hissing sound coming from the engine indicates that there is most likely a leak in the manifold. This can be from a failing gasket.

1. You are using the wrong gas type
   You need to put more water in the radiator
2. The engines piston rings are worn out
   None of the above

Other than worn piston rings, be sure to check valve seals for damage as well.

1. The fuel you are using
   The ignition timing
2. Whether it needs an oil change
   None of the above

The most likely cause of this problem is ignition timing. Even if it is something else, you need to have the car checked by a mechanic.

1. Window wiper liquid reservoir
   Alternator
2. Oil filter
   None of the above

This could be caused by your alternator actually overcharging your battery.

1. You are driving too fast
   Your tires are too large for the engine to turn thus putting it under strain
2. A problem with the emission system
   None of the above

If nothing seems wrong with the coolant level and there are no obvious radiator leaks, the emission system on your car is probably not working properly, especially if you have neglected maintenance.

1. The ABS system
   A loose wheel nut
2. A tire that needs to be replaced
   None of the above

If your car has an ABS system in it, you will notice shuddering when braking hard. That's just the system working. If it doesn't have an ABS system, there could be a major problem with your brakes. Have them checked out.

1. Your engine is burning too much fuel
   You need to change your oil
2. Your car needs a good engine clean
   None of the above

Black smoke = too much fuel burned. This can be caused by numerous problems, including damage to your fuel injectors, sensors that are malfunctioning, a clogged air filter or a blocked fuel return line. A mechanic is the best person to find the problem.

1. Whether someone dropped a cinnamon roll in the engine compartment
   The coolant level. You may have a leak in your radiator
2. Oil filter
   None of the above

Coolant has a very sweet smell, so if you do notice this, it is important to check that your radiator does not have a leak.

1. Spark Plugs
   Accelerator pedal
2. Inflate the tires
   None of the above

Often, a miss in the engine could be as a result of a spark plug breaking down and not firing. This is the first thing you should check.

1. The battery is not charging
   The battery is overheating
2. The battery is working properly
   None of the above

A non-charging battery will eventually result in your car not starting.

1. The brake pedal needs to be replaced
   Air has entered the brake system
2. Your car needs a service
   None of the above

When air enters the brake system, the brakes will need to be bled, this means letting all the brake fluid out, along with the air and then replacing it.

1. If the car has gas
   Your accelerator cable
2. Spark Plug Leads
   None of the above

If the spark plugs have been check and are fine, one of the leads might be breaking down and could be the source of the problem.

1. Water got into gas tank
   Water got into the radiator, overfilling it
2. Water covered the coil/spark plugs causing the engine to stop
   None of the above

Although it may seem like a serious problem, this you can solve yourself. First make sure all the wet areas are dried, using high pressure air if necessary. Then spray with an anti-moisture lubricant.

1. The starter motor
   The ignition
2. The key
   None of the above

If all your electronics are still working properly (lights, clock and radio, for example) the chances are that the problem stems from your starter motor.

1. Water entered the dry clutch system
   Your gears rusted
2. Your clutch pedal wire rusted
   None of the above

Most clutches and gearboxes operate in a dry system. If water penetrates it, and it can happen, especially if you drive through a large enough puddle, selecting gears can become problematic. The only way to fix this problem is to let everything dry out naturally over time.

1. The fuel cap
   Diesel filter
2. Alternator
   None of the above

Water will collect in the diesel filter from time to time. When too much collects there, the water in fuel light will come on. This is easily fixed by just draining the filter, cleaning it up and letting it dry.

1. Take the car to a mechanic
   Get towed to the nearest gas station
2. Ignore the light and carry on driving. The car will be fine
   None of the above

Any warning lights should be adhered to as soon as possible. Carrying on driving like nothing is wrong will only cause some form of failure in your engine down the line.

1. Time for a new engine!
   Your ignition is faulty
2. A flat battery
   None of the above

In all likelihood the car battery has drained. This can be for a number of reasons, but maybe you left the lights on overnight.

1. You need to try a new type of fuel
   You have a flat battery because the alternator has not charged it
2. Your engine needs a service
   None of the above

If your battery has been slowly discharging, chances are the alternator is not working as it should. The main task of the alternator is to keep the battery charged. Make sure it is doing its job.

1. You need to do an oil change
   There is some sort of animal stuck in the engine compartment
2. The belt to the alternator is loose and slipping
   None of the above

Generally, a squealing noise from the engine means a loose belt, usually to the alternator, but sometimes also the radiator's fan belt.

1. Air has entered the gear hydraulic system
   Your car needs a service
2. You need to replace the clutch
   None of the above

In this situation, air has entered the hydraulic system and it will need a trip to the mechanic to sort out.

1. The floor of the car needs to be replaced
   The wheel bearings need to be replaced
2. There is a hole in your exhaust system
   None of the above

A hole in the exhaust will amply the sound of your engine greatly.

1. Alternator
   Radiator
2. Brake fluid reservoir
   None of the above

If the voltage produced by your alternator is too high, it could cause your light bulbs to blow

1. The oil level in your engine
   How much gas you have
2. The level of coolant in your radiator
   None of the above

If your engine has a lack of oil, it can nolonger lubricate itself properly. This means that metal parts can touch, which would cause the sounds you hear.

1. The automatic choke is not working properly
   You need to use a different gas
2. It needs a new radiator
   None of the above

Automatic chokes, particularly in older cards, can fail in colder weather. If they are not working properly, the engine will not run well until it has warmed up sufficiently.

1. You need to replace the water in the radiator
   You need a new old filter
2. The computerized engine control system is faulty
   None of the above

An intermittent miss can be caused by a number of things. Have the car's computer system checkout out, however.

1. Fuel system
   The radiator
2. Crankshaft
   None of the above

Although the smell of sulfur can be a number of things, if it is not a catalytic converter, it is probably a problem with your fuel system.

1. Leave it, its fine
   Try a new type of gas
2. Perform an oil change
   None of the above

Black oil with gritty particles can damage your engine. Time to perform an oil change.

1. Oil levels
   Coolant levels
2. Transmission fluid levels
   None of the above

If transmission fluid is leaking out of your gearbox, you may be in for a nasty surprise down the line. If you have any problems with gear selection, have it checked immediately.

1. Open the radiator cap
   Open the fuel cap
2. Keep the hood open
   None of the above

If you car has overheated, never open the radiator cap. The chances of hot water spurting out are high.