BMW Engine Runs Beautiful, But Stalls Intermittently After Crankshaft Replacement - Any Ideas?

Technical Discussions
1

I recently replaced the crankshaft on my BMW, and while the engine runs beautifully, I’ve been experiencing some intermittent stalling issues. The car will just shut off randomly, and it’s becoming frustrating. I’ve checked the usual suspects: fuel delivery and spark plugs, but no definitive answers.

Things I’ve Tried:

  • Checked Fuel System: I ensured that the fuel pump is operating correctly, and the fuel filter is clean.
  • Spark Plugs: Inspected and replaced if necessary, but it didn’t seem to make a difference.
  • Sensor Checks: Looked into the crankshaft position sensor and camshaft sensor - both seemed fine, but I’m wondering if they might be intermittent issues.

What I’m Looking For:

I’m hoping to gather some insights from anyone who might have faced similar challenges. Have you encountered stalling post crankshaft replacement? Any tips on additional troubleshooting? What sensors or components should I be checking next?

Additional Thoughts:

  • Electrical Issues: Could this be an electrical issue? Maybe a loose connection somewhere?
  • ECU Related: Could the ECU need a reset or reprogramming?

Let’s brainstorm together! Any input would be greatly appreciated. Thanks!

4 Likes
2

I recently had a similar issue after changing my crankshaft. It turned out to be a fuel delivery issue. Check your fuel pump and filters to make sure they aren’t clogged!

3

That’s a great point! Fuel delivery can really affect performance. Have you also checked for any vacuum leaks? They can cause similar stalling problems as well.

4

I had random stalling with my BMW too after a crankshaft replacement. It ended up being a faulty ignition coil. It’s worth testing each component of your ignition system!

5

Wow, didn’t think about that! How did you pinpoint the ignition issue? My engine runs fine sometimes but still stalls occasionally.

6

Make sure to check your crankshaft position sensor too! They often get disturbed during replacements and can cause stalling if faulty.

7

That’s definitely something to consider. Also, when was the last time you changed your spark plugs? They can contribute to intermittent issues.

8

I’ve seen mechanics blame vacuum leaks for stalling issues after repairs. So, definitely check all the hoses post-crankshaft work!

9

It’s crazy how a tiny crack can lead to big problems. If it’s not the hoses, then I would check the fuel injectors for any blockage.

10

In my experience, a low battery voltage can sometimes cause intermittent stalling. It might be worth checking your battery and connections!

11

Interesting! I guess everything is interconnected in our engines. Any chance it could be a bad ground connection as well?

12

This is quite the mystery! Maybe it’s time to consult a more experienced mechanic if you can’t isolate the problem. Seems like it could be a combination of issues.

13

Definitely! But let’s hope you won’t have to pay an arm and a leg for it. Mechanics can be like car doctors!

14

It might be worth it to get an OBD2 scan. You might be able to find some error codes related to the stalling issue that can help narrow it down.

15

The OBD2 sounds like a solid plan! If it were me, I’d be doing some serious troubleshooting. Time to channel my inner detective!

3 Likes
16

It sounds like you’re dealing with a tricky issue! Have you tried using an OBD-II scanner? It can give you insight into error codes that might point to the stalling problem.

17

Yes! The scanner showed some codes related to sensor readings. But I’m not sure how to interpret them. Any tips?

6 Likes
18

Make sure to check the fuel pressure while you’re at it. A gauge can help determine if the fuel pump is delivering adequate pressure. Stalling can often be fuel-related.

19

I had a similar stalling issue after replacing a crankshaft. It turned out to be a faulty camshaft sensor. Have you checked yours?

20

I haven’t checked fuel pressure yet. How do you connect the gauge properly?