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Iain525

E34 1991 525i non start

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1991, BMW E34, 525i M50

 

It's been intermittently not starting for a little while now.  Always left it, or charged the battery, and next time i've come to it it has started.  Now it's not....

 

Battery freshly conditioned and sitting at 12.5v.  Key in position one goes down to 12.2.  Key in "start" position goes to 11.8v (and the dashlights dim down) but it doesn't even attempt to crank over.  No noises from starter solenoid either.

 

Just tried a fresh battery from a working car and exactly same behaviour.

 

Where do I start diagnosing?!  Starter motor?

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Like this? 

 

Is it doing it when hot and will it start when you put the jumper cables on it?

 

 

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Yeah I'd say the same. Lights dim a bit. My video:

 

 https://youtu.be/DboiPE9uINg

 

 

Can't start it anymore but don't recall it ever doing it hot.

 

Does it with a known good battery but previous times a jumper hasn't made a difference.

 

Think I'm going to check earth's next.

 

 

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My car used to do that only when hot only.

 

Once it had cooled down it would start right up, or if I jumped it. 

 

I put it down to the starter motor sticking when hot + a weak battery.

 

For me the  cure  was a new battery, it never did it again after I replaced the battery.

 

Sound like a slightly different issue for you, I would also check the earth as the next step.

 

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As stupid as this sounds, but next time try hitting the starter motor on the head with a long spanner or something, at the same time as turning the key. Sometimes the solenoid gets stuck when hot, if this solves it then you know you need a new starter 

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