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Juan Crespo
Juan Crespo, Tech Trainer
Category: BMW
Satisfied Customers: 1526
Experience:  A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
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Turned key and it clunked twice. Jumped it and it started,

Customer Question

Turned key and it clunked twice. Jumped it and it started, drove 5 feet and it died. Turned the key, no crank, not even the clunk- clunk.
JA: Can you turn the steering wheel at all? And what about the key? Is it worn or damaged?
Customer: Wheel turns fine. Key is relatively new and not worn.
JA: What is the model/year of your BMW?
Customer: 2004 325xi
JA: Are you fixing your 325xi yourself? What have you tried so far?
Customer: Haven't tried as it is undiagnosed. I have a program tool handheld by schwaben.
JA: Anything else you want the mechanic to know before I connect you?
Customer: The battery was replaced in May.
Submitted: 10 months ago.
Category: BMW
Expert:  Juan Crespo replied 10 months ago.

Hi there.

If it started when you jumped it, chances are the issue is with the battery getting discharged and/or the charging system malfunctioning. Do you have access to a voltmeter you're familiar with so you could perform a few basic electrical tests under my guidance?

Customer: replied 10 months ago.
I have a volt meter and I have a hand held diagnostic tool called schwaben which you can look up at ECS tuning.
Expert:  Juan Crespo replied 10 months ago.

OK. First, make sure the battery cable terminals are clean and tight. Once that is done, let's try that voltmeter;

  • measure battery voltage with key and all accessories off - should be over 12.5 volts.
    • If not, the battery will have to be charged and load tested for the next test to yield accurate results.
  • start the engine, then measure battery voltage with the engine running at 2000 RPM
    • with all accessories OFF, voltage should read more than 13.5 volts
    • with headlights and A/C ON, voltage should read more than 13 volts

Please let me know what you find.

Customer: replied 10 months ago.
I will try that in the morning as I am not able to do it right now.Thanks
Expert:  Juan Crespo replied 10 months ago.

My regular hours are weekdays from 2 to 8 PM AST. Hope to hear from you then.

Best Regards.