Why Won't My Car Start?

[Val]

If you turn your car key and get nothing, or get anything less than an engine roaring to life, you might be in for a bad day. Starting problems can be very frustrating because there are so many things under the hood that can keep a car from starting. Heck, pretty much everything under the hood can keep the car from starting.
In order to troubleshoot a no-start problem, you need to start at the beginning of the line, the battery, and work your way back. Some tests for a no-start problem are simple, others are a pain in the neck and a technical nightmare. Nonetheless, you need to figure out why the car won't start, so I'll try to help.

Check Your Fuses:

These are GM fuses.

They are diferent from car to car, but normally are the same thing.
Few cars have a fuse associated with the starting system, but before you go monkeying around with everything, check your fuses to be sure it's not that simple.

Battery Corrosion:

The pics say for themselves.

Over time your battery connections can become dirty, or corroded. This corrosion breaks the connection your battery has with the rest of the car, and it won't start. Try cleaning your battery posts and try to start the car again.

Dead Battery:



The most common reason your car won't start is a dead battery. This is the case!!!
I think my baby Plastic Flute asked me something about it in the past.
Well, if you have a battery tester that can measure cranking amps, test your battery to see if it's weak. If you can't test it yourself, you can test the battery indirectly by jump-starting the car. If it starts right away, your problem is most likely a dead battery. Replace the battery, and clean the battery connections to ensure good contact.

Bad Ignition Switch:

This is destroyed!!! Don't worry, this won't happen to you. I'm just showing you an extreme situation.

If your battery checks out, but the starter is still silent, it may be a faulty ignition switch. Turn the key to the on position (not all the way to start). If the red warning lights on your dash don't light up (and your battery connections are clean), the ignition switch is bad. If they do light up, turn the key to the start position. The dash warning lights should turn off at this key position (most cars). If you're not sure, turn on the headlights. When you try to start the car, the lights should either dim (a lot) or turn off completely. If they do, your ignition switch should be ok. If not, the switch will need replacement.

Bad Starter Connection:

Well, not that bad. Just a little messed. Could be better.

Corrosion can not only keep your battery from connecting, it can affect any electrical component, especially the ones exposed to the elements like the starter. If you have a helper, you can test the connection by holding a circuit tester lead on the wire that engages the starter. This is the smaller of the two wires connected to the starter. Be sure no part of your body is near the moving parts of the engine - it could still start at any time! Have a friend turn the key and check the current. If you're getting current to the starter but it ain't spinning, it needs replacement.

So, in 90% of the cases, this little tutorial helps a lot.
Any problems or doubts, just ask me!

[Samson The Cat]

Cold weather can also be a cause for cars not to start.

Be glad, you didn't have such icy temperatures as we had during the last weeks. At -20°C my car did start, but it didn't sound good during the first seconds. My windhield wiper water got frozen, because I watered it down too much - didn't expect temperatures below -15°C.

On my way to work I saw about two cars a day who stopped working - probably diesel cars. The colder it got the more their fuel resembled candle wax.

[Val]

Cold weather can also be a cause for cars not to start.

Yep!
You are right!!!
But if you have a good start engine and and battery with a high charge, rarely you will have problems to start the engine in cold days. This is only for old cars.