The other answers are pretty much spot on. However I will add that the radiator cap is not just a cap, it is also a pressure/vacuum valve. When the coolant heats up it expands putting pressure on the valve, when enough pressure is applied, the valve opens and coolant is expelled into the overflow bottle. When it cools a vacuum is created which ducks coolant out of the overflow bottle. If the radiator cap is faulty the valve Canberra stuck closed causing too much pressure to build up. When pressure goes up do does the temperature, eventually the coolant will boil. If the valve I'd stuck open, this causes the coolant to pass in both directions and make a significant. Alert noise to boiling water, in this case the coolant. As not actually be boiling. Or it may be boiling at a lower Temperature then it is ment to, but the engine is not actually overheating. The fix for ether senerio is to replace the cap.
The probability is that the fault is electrical rather than mechanical.If your engine has a high-tension distributor, the fault can be anywhere between the #4 connector on the distributor cap, through the HT lead to the spark plug. It could also be the spark plug itself or a fault in the distributor cap. But leads are the most likely culprit, so should be checked first. One way to do this is to run the engine at night and see if you can see any visible sparking from #4 lead. If the cap is cracked, there could be visible sparks there, though often a fault of this kind can be inside the cap.On many modern engines, there is no HT distributor. Instead, each spark plug has its own HT transformer (coil) mounted on it, and this is triggered directly by the ECU. These transformers sometimes fail, but as sealed units, can only be replaced, not repaired. A test would be to swap the transformer with another cylinder and see if the misfire moves with it.The spark plug could be faulty - for example have a crack in the ceramic insulator, or the electrodes could be eroded away or the gap improperly set. Easy to check/fix.If none of the above is a clear indication of the fault, the next thing to check would be the injector for that cylinder, if it a) has fuel injection and b) has an individual injector per cylinder. I’m not sure how you check an injector - I’ve never had to do it.If that’s OK, you’d need to start considering mechanical possibilities. Burned out valves, piston, piston rings… all are possible, though most of these would probably also be indicated by a smokey exhaust, especially when revving after a period of idle. Note that because of the misfire, there’s likely to be some unburnt fuel in the exhaust, which shows up as white smoke. If there’s grey/blue smoke, that’s oil and much more an indicator of a valve or piston ring problem.
How to Start a Car with a Bad Starter?The tips described below are the best possible ways to instill life into a dead starter. Try them one by one until you find a solution.Check the ConnectionsThe starter is an electric motor and a part of an electrical circuit. It sets the engine of a vehicle in motion. So, the engine won’t respond if there is an issue with the battery or the connections. Check the joint of all the connecting cables between the battery and the starter. Tighten everything because a loose connection means less flow of current to the starter.Check the starter for loose connections.Clean the CorrosionCorrosion could also be the culprit in obstructing the flow of electrical current. The dirt and grease can accumulate on the starter and the battery, and corrode the cable clamps and terminals of the battery.If this is the case, disconnect the battery and use a fine-grade sandpaper to clean the affected areas. It will remove the dirt, stain, and rust. If the corrosion seems pretty stubborn, apply a mixture of water and caustic soda. Be careful about not to damage any connections.SEE MORE:5 Things to Check for Car Hard Starting ProblemsHow to Diagnose an Engine that Doesn’t Start?Tap with a ToolIt’s another simple trick to the manual of how to start a car with a bad starter. If the starter is dead but the windshield wipers and headlights are working, the problem could be a stuck gear. The starter cannot function properly if that happens.Give the starter a tap about 4 to 5 times with a tool such as a hammer or a wrench. You have to carefully locate its position inside the car and distinguish it from other components. Besides, the taps should be gentle so that the part is not damaged.Tapping the starter with a hard tool might be effective.Sometimes, this method works even if the starter is actually bad. In that case, tapping will provide a temporary fix but the car could be dying anytime soon.Give the Car a Good ShakeIt’s another trick to release a stuck gear. However, you should do it only when you are a noob and don’t have the expertise to open the hood and locate the starter. Push down the vehicle’s handbrake lever while it is in top gear. It will rock the car and may loosen the jammed gear in the process.Ref: Find best deals of used cars from reliable Japanese sellers
It could be any number of problems. In no particular order.The battery can be down just enough that the car still cranks but does not have enough power to actually start the car.A bad fuel pump. Meaning the engine is not getting fuel.A bad computer.Flooding. Too much fuel for the amount of air. Can you see black smoke or smell fuel?Running to lean. Not enough fuel for the amount of air.The timing could be out.Maybe you have dead spark plugs if it is a petrol.Bad glow plugs if it is a diesel. In this case you will see white smoke coming out the back mixed with a bit of black.Bad compression.If you are living in a super super cold climate like Canada maybe you have frozen fuel.Any type of electrical problem such as immobiliser problems, if it is a petrol ignition problems like others have mentioned or maybe your key is faulty. I remember my sister’s Volkswagen not starting because they key was faulty and was not communicating to the car’s computer and because it was not doing this the immobiliser did not deactivate.A clogged air intake. It is possible for things to find their way into the air intake and block the air flow. It is not very likely that this is the problem though but it is worth checking.Contaminated fuel. While it does not happen very often it is possible some fuel you bought came from the gas station contaminated.There really are a number of reasons.