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Engine acts like it is going to quit running?

Tiny
BOBBY_BLACQ
  • MEMBER
  • 2004 BMW 330CI
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 121,607 MILES
Hello, so I have this ongoing issue while I'm driving where it feels like 1 or 2 coils get disconnected and the engine acts like it's going to shut off after some seconds it picks up but doesn't really give full power. I have changed out all coils and plugs also changed my fuel pump, but the issue still lingers.
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Monday, February 26th, 2024 AT 2:36 AM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
If the engine is misfiring it should have a code lets run the computer to see if any are stored, this guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Also, please go over this guide to help see what's going on:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

It sounds like you may have a fuel injector going out. Once we run the codes it should tell us which cylinder is having an issue so we can go from there, the fact it does not have the problem continuously is posting to something electronic which is good. Here is how to test a fuel injector and i have included instructions on how to swap out the injectors as well in the images below.

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Check out the images (below). Please upload videos in your response to the problem so we can see what's going on.

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Monday, February 26th, 2024 AT 12:14 PM
Tiny
BOBBY_BLACQ
  • MEMBER
  • 3 POSTS
Hi Ken, thanks for the reply. Testing the injectors has been on my mind but I have been lazy to do that so I'm going to have that checked out. I used a Carly car scanner and got the code below.
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Monday, February 26th, 2024 AT 1:39 PM
Tiny
KEN L
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Let's remove the #2 and #4 spark plug to see what they look like. Also, let's do a compression test. This guide will help:

https://www.2carpros.com/articles/how-to-test-engine-compression

Do you notice the coolant level going down slowly? You may have a blown head gasket. If the spark plugs are very light colored, I would say the fuel injector can be causing this.
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Tuesday, February 27th, 2024 AT 9:19 AM
Tiny
KEN L
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  • 48,363 POSTS
Anything?
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Saturday, May 11th, 2024 AT 11:38 AM

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