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Matt
Matt, Engineer
Category: BMW
Satisfied Customers: 21125
Experience:  Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
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My name is ***** *****, I have a 1997 BMW 740I doesn't crank

Customer Question

Customer: my name is ***** *****, I have a 1997 BMW 740I doesn't crank
JA: Thanks. Can you give me any more details about your issue?
Customer: the starter motor is good, the ignition switch is good, and when the weather is cold and it rains the car wont start. This happened last year as well as this year.
JA: OK got it. Last thing — JustAnswer charges a fee (generally around $18) to post your type of question to BMW Experts (you only pay if satisfied). There are a couple customers ahead of you. Are you willing to wait a bit?
Customer: yes
JA: OK. Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 1 year ago.
Category: BMW
Customer: replied 1 year ago.
The battery is fully charged, and this year during the month of November, the first time i initiated to start the vehicle the crank didn't work, i waited about 5 minutes and then crank started. During the month of December I've tried to start the vehicle every single day and have been unsuccessful, I have tried everything to start vehicle with no success.
Customer: replied 1 year ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Provide Diagrams, Manuals, or Instructions. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  Matt replied 1 year ago.

Hello

If the car's not cranking then first check it can turned over by hand so double checking for any mechanical issues

If OK then check that the main battery cables are on tight and the terminals are clean and bright. Do the same for the engine / gearbox earth strap.
Then follow the main positive lead back to the engine and down to the starter motor, and check the connection at this end as well.

There should also be a small wire to the motor which should have 12V when you're turning the ignition switch to crank. If the 12V isn't there, check back along this wire for damage to the insulation or corroded connections

This 12V feed comes directly from the ignition switch so this may be faulty and need replacing

Check the resistance of the main positive lead that runs down to the motor as anything more than a few ohms and it should be replaced

Tne other thing to consider is that the immobiliser is faulty and preventing the starter from being enabled - however if the dash / ignition lights are on then this usually means that its off

If this is all OK then its possible the car needs a new starter motor

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Expert:  Matt replied 1 year ago.

Hi

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