i change my battery still dint want to start. model BMW 520i?

Answer 1

Do you mean that when you turn the key absolutely nothing happens? Or does the motor just sort of turn over a little but not much, or maybe you just hear a clicking noise? We need more info to diagnose the problem.

Okay, I got your email just now but I'll answer here in case anyone else as the same problem. This will be a lonnnng answer but it's best to make sure you have everything you need to know, okay?

You said that sometimes it just clicks and sometimes it turns a little bit and then nothing...That definitely sounds like an electrical problem. I know that you have changed the battery so that means there is a bad connection somewhere else. It could be a faulty solenoid, or at least a bad connection to the solenoid or the starter motor.

We'll start with the solenoid. The solenoid is a bigger switch that is electrically operated when you turn the key. The switch the key goes into cannot handle the amount of electric current that your car's starter motor needs, which can be a LOT of amperes. So you turn the key, that operates the solenoid (bigger switch) and that sends the current from the battery to your starter motor, which is what actually turns the engine over so it will fire up.

Now, if the solenoid is dying but not quite dead, it will let a small amount of current go through but not much. But more likely here, you have a bad connection to the solenoid or from the solenoid to the starter motor itself.

The best way to fix this requires that someone has to get her or his hands a bit dirty. You will need a couple of spanners and some clean rags and some spray for cleaning the connections. There's spray you can buy at the garage for this. DO NOT use petrol because you could have a big problem with fire! Starter motors always produce sparks when they operate and you do not want petrol fumes exploding...

First, you need to disconnect the battery (the black [negative] terminal) so there is no risk of a short circuit. Wrap a clean, dry cloth around the battery connection cable so it cannot accidentally make contact with the battery. The positive wire can stay connected, because with no negative (earth wire) there is no circuit.

Then you follow the wires that go from the starter motor up to the solenoid. The starter motor is sort of cylindrical shaped and about eight to ten inches long and about four inches around and it sticks out from the bell-shaped end of where the gearbox bolts onto the motor. One at a time, you disconnect the wires from the starter and clean them thoroughly so there's no grease or oil on them.

Only disconnect each wire at one end, clean it, then put it back. Then do the other end. It's only a few wires, but the BIG one on the starter is absolutely key in all this. It draws a huge amount of current so this is why you must have your battery disconnected first, okay? This wire is the 'positive' that sends the power into the starter. No power, nothing goes. (The negative connection runs through the body of the starter.) This thick wire will probably be held on a brassy-looking bolt thing with a brassy nut. Unscrew the nut with a spanner, remove the wire and clean the connection (which is also brassy or silvery and looks like a flat piece of metal with a hole in it), then put it back and do everything up. Don't forget to clean the nut and any washers, too. If they have oil on them you will have a bad connection.

When everything is all clean, make a final check that nothing is lying loose. Then reconnect the battery and try the key.

It ought to go. If it doesn't, then the solenoid is probably a dud and has to be changed. In that case, get help from a person with some mechanical knowledge.

That should do it. Hope this helps!

Answer 2

Not enough info. What year is it? What noise does it make when you try to start it? It could be the battery isn't connected properly, the starter is shot or a belt broke.
Are there any dash warning lights on?
Take it to a BMW shop. so they can Scan and read the codes.

Answer 3

i think of your battery is decrease than the lower back seat, this is in my son's BMW. The lower back seat may well be bumped off with an extremely company tug in an upward course to drag the clips unfastened on the front of the seat. you will bounce-start up the vehicle from decrease than the bonnet. there's a sprint element for the effective bounce lead on precise of the engine. If I undergo in concepts wisely, interestingly like a great stud or nut and that's recessed between 2 plates to evade it from shorting against the bonnet interior the form of an twist of fate. The unfavourable bounce lead can circulate to any earthed area of the engine.

Answer 4

What's the matter is you're changing stuff without knowing what's wrong. Someone with a voltmeter can pinpoint the problem in two minutes.

Answer 5

try the alternator, alternate belt?