Car won't start? Try this.

How to Fix a Car That Doesn't Start

from wikiHow - The How to Manual That You Can Edit

Repairing a car that wont start can be as simple as plugging in a wire, changing a fuse, or as complicated as replacing major engine components. The following may help you discover the problem, but there is no way to cover every possibility. We will look at individual possible problems, and ways to check for them.

Steps

1. Check the battery. If you do not have sufficient voltage and cranking power, the car simply won't start. Have someone attach booster cables to your battery if the engine seems to be turning over slower than normal. If the battery seems charged, and the starter motor still doesn't turn the engine, the problem may be in your starter motor itself, or the battery cables. Changing the starter is not too complicated, but if you decide to attempt this, try to find someone who has done it before to help you, or buy a do it yourself manual that has a description and pictures of what you need to do.
   
2. Make sure you have fuel in your tank. Hopefully your fuel gauge is working, but some lose calibration, and will register remaining fuel when the tank is dry. You cannot open a true fuel injected system to look for fuel, but on older cars, you can remove the air filter from the breather housing by taking the wing nut or other fastener off the top and lifting the cover. Here, when you pump the accelerator pedal, you should see gasoline spray into the carburetor throttle body. Some cars have electric fuel pumps situated in the gas tank, and having someone listen at the filler cap while you turn the ignition switch from off to run, they will hear the pump cycle on for a few seconds, then click off when the system pressure reaches the required level. This can tell you if the pump is not working, but changing the fuel pump is a difficult and possibly dangerous project.
   
3. Remove a spark plug wire from your spark plug and use an insulation handled screwdriver to ground the metal fitting inside the spark plug boot to the engine, and have someone turn the engine over while you watch for a spark. You should have the metal screwdriver shaft about an eighth of an inch from a clean metal surface on the engine, and be careful not to touch any uninsulated parts of the tool while testing the plug. If you do not have a spark, you have an ignition circuit problem, and depending on the vintage of your vehicle, you may have to replace anything from a coil wire to an ignition CPU, or computer.
   

Tips

• It is not possible to cover all the reasons a car won't crank in this article, but if you are able to find a do it yourself book at a department store or auto parts supply, or your local library, they can help with specific problems.
  
• Look at the wires, hoses, and other components under the hood. Often, one unplugged wire, or one broken vacuum or fuel line will be the problem, and these are simple and inexpensive to fix.
  
• Check the owner's manual for fuses, relays, and circuit breakers related to either fuel or ignition. You should be able to locate these and make sure they are not tripped or blown. In the relay block, you can exchange relays that are the same size from another component, such as the AC blower, to test the ignition relay.
  
• If the owner's manual doesn't list a fuse or relay for the fuel pump, your car has a mechanical pump, and the only way to check it is to remove a fuel line, and turn the engine over to see if gasoline comes out, but this is very dangerous!
  
• Even when your car doesn't start when you try the ignition, it may show a "code", or information stored in the computer, that can be accessed by a technician to find the source of your problem. This may be a "check engine" light, or other indicator.
  
• Listen to your engine when you crank it. If you hear a knocking sound, backfiring, or misfiring, you may have serious engine problems such as jumped timing, stuck or broken valves, or a flooded carburetor.
  

Warnings

• Do not remove any wires or other electrical parts without disconnecting the negative (-) post of the battery.
  
• Do not remove fuel lines unless you know how to bleed off the pressure in them, injected fuel systems are pressurized, and will blow off gasoline when they are uncoupled.
  
• When testing for spark or doing anything else which requires turning the motor over while looking under the hood, be careful of the fan blades, belts, and other moving parts.
  
• Never turn the engine over or crank it with the breather cover removed. Fuel in the throttle body can ignite!
  

Things You'll Need

• Once again, a do-it-yourself manual, such as Peterson's or Hayne's is more complete and vehicle specific than this article.
  
• Battery tester or jumper cables.
  

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