BMW Engine Runs Beautiful but Stalls Intermittently After Crankshaft Replacement?

BMW
1

I’ve recently replaced the crankshaft on my BMW, and while the engine runs beautifully, it has started to stall intermittently. It’s quite frustrating because I was hoping this repair would solve the issues I was experiencing before.

Symptoms:

  • Intermittent stalling at idle
  • Engine runs smoothly most of the time
  • No check engine light (yet)

I’m curious if anyone else has faced similar issues after replacing the crankshaft or crankshaft sensor.

Questions:

  • Did you have to adjust anything else after the replacement?
  • Any sensors or components you found that were causing trouble?

I’m looking for troubleshooting tips or advice on what to check next. Any experiences or insights would be greatly appreciated!

5 Likes
2

After a crankshaft replacement, stalling can often be linked to sensor issues. Have you checked the crankshaft position sensor? It’s crucial for engine timing.

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3

That’s a good point! I also wonder about the fuel delivery system. A clogged fuel filter can cause intermittent stalling.

4

Intermittent stalling can sometimes be due to poor electrical connections after repairs. Make sure all wiring is intact and connections are clean.

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5

Definitely check the electrical connections! I had a similar issue where a bad connection at the fuel pump caused stalling. It drove me crazy!

6

You might want to inspect the Mass Air Flow (MAF) sensor too. If it’s dirty or malfunctioning, it could lead to inconsistent fuel-to-air ratios, causing stalls.

1 Like
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Good point! A well-functioning MAF is essential for proper engine function. Clean it, and it might solve the issue!

8

Fuel delivery problems could also stem from the fuel pump or injectors. Have you had those checked? They can give erratic performance if malfunctioning.

9

That’s true! If the fuel pump isn’t supplying enough pressure, it can definitely cause issues during acceleration or idling.

10

Have you scanned for error codes? They can offer clues as to what sensor might be malfunctioning. It’s an essential step.

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11

That’s solid advice! It could save a lot of guessing and lead straight to the culprit.

12

I once dealt with stalling after a crankshaft replacement too! The ECU just needed a reset. Might be worth giving that a try if all else fails.

13

Interesting! I didn’t think of that. An ECU reset can sometimes clear odd behavior. I’ll definitely keep that in mind!

14

Has anyone here heard of a ‘phantom stall’? Because after my crankshaft replacement, my car would stall like it was playing hide and seek with the problems!

6 Likes
15

Haha, I can relate! It’s as if the car has a personality of its own sometimes. But really, check those sensors!

16

Don’t forget to also reflect on the work done during the crankshaft replacement. Any overlooked details, like gaskets or seals, could lead to bigger headaches later.

17

Great advice! Also, inspect the wiring around the crankshaft position sensor. Sometimes they can get damaged during the replacement.

18

If the engine runs beautifully but stalls, consider checking the ignition system as well. A faulty coil could also cause intermittent stalling.

19

Inspecting the wiring is key! I’ve seen it fix stalling issues in several cases.

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Also check the fuel delivery system. Issues with the fuel pump or clogged filters can cause similar symptoms.