Does not start

Tiny
DAVID GIL
  • MEMBER
  • 2002 BMW 750LI
  • 4.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 12,000 MILES
No fire.
Monday, October 1st, 2018 AT 5:39 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi and thanks for using 2CarPros.com.

Most times spark is lost, it is the result of a bad crankshaft position sensor / pulse generator. However, it should have set a trouble code. First, scan the computer to determine if there is a fault code stored. Here is a quick video showing how to use a scanner. If you do not own one ( and most do not ) many parts stores will lend or rent one to you.

https://youtu.be/YV3TRZwer8k

Also, take a look through this link:

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

Here is a link showing in general how one is replaced:

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

If through a trouble code you determine the sensor is the issue, here are the directions specific to your vehicle for replacement. The attached picture correlates with these directions.

______________________________

12 14 521 - Replacing crankshaft pulse generator
Necessary preliminary tasks:
- Read out fault memory of DME control unit; if necessary, work through test schedules
- Switch off ignition
- If necessary, remove underbody protection.

Installation location:
On transmission housing at bottom right.
Unlock plug (1) and remove.

Release screw.

Withdraw pulse generator (2) from transmission housing.

Installation:
Replace screw.
Installation:
Now clear the fault memory.
______________________________________________

Let me know if this helps or if you have other questions.

Take care,
Joe
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Tuesday, October 2nd, 2018 AT 8:06 PM

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