E90Post
 


Extreme Powerhouse
 
BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Rough idle + service engine soon AFTER fixing high pressure pump and spark plugs



Reply
 
Thread Tools Search this Thread
      11-12-2024, 12:24 AM   #1
JAM335i
Registered
JAM335i's Avatar
0
Rep
4
Posts

Drives: BMW 335i
Join Date: Nov 2024
Location: USA

iTrader: (0)

Exclamation Rough idle + service engine soon AFTER fixing high pressure pump and spark plugs

Hi all - looking for help to keep my car running (hopefully without putting thousands more into it)...

2007 BMW 335i convertible. 145k miles.
Car was in great shape and driving perfectly.

Chain of events:
- Filled with gas. About 2 minutes driving down the road, Check Engine logo light goes on. Drive to mechanic.

- Replaced High Pressure Fuel Pump. And new hose. Car still taking a few extra turns to start and rough idle.

- Replaced spark plugs and coil. Same issue.

- Service Engine Soon light now came on.

Mechanic saying I need to replace all 6 fuel injectors which will cost me around $4000.

Questions:
1. Does anything know what went wrong?
2. Are these normal problems to have and in this order?
3. Is it possible I got a bad batch of fuel?
4. Is there anything else to do that doesn't involve changing all 6 fuel injectors?
5. Will fixing this issue actually fix the engine problems or will I probably continue to have more problems?

Any advice would be amazing. Trying to keep this car going as long as possible!

Thanks!

p.s. this is my first post so if I put it in the wrong place please let me know where this should go
Appreciate 0
      11-12-2024, 12:53 AM   #2
lookalikehuuh
Lieutenant Colonel
United_States
1032
Rep
1,545
Posts

Drives: 2006 330i, 2007 335i
Join Date: Sep 2014
Location: San Diego, CA

iTrader: (0)

Oh man this "mechanic" is taking you for a ride.

Step 1 is for you to go get yourself a BMW specific scan tool. You can download software like INPA or ISTA then order an OBDII cable for your laptop and that will give you dealer level diagnostic abilities.

Another really good option is bimmergeeks protool which will work on your phone with a wireless dongle you can purchase from them. A third option would be a bmw specific scan tool like a foxwell. Fourth option would be a more "pro" level scan tool like an Autel tablet scanner.

Once you a proper scan tool you should be able to read BMW specific trouble codes that will allow us to help you diagnose your car.

You definitely should not go back to that mechanic since he is unloading the "parts canon" at your expense of course.
Appreciate 2
      11-12-2024, 03:17 AM   #3
swellengear
Private
swellengear's Avatar
South Africa
148
Rep
91
Posts

Drives: 2008 135i
Join Date: Feb 2023
Location: Swellendam, South Aftica

iTrader: (0)

I agree with lookalike. You need to get the fault codes read.
Appreciate 0
      11-12-2024, 10:14 AM   #4
JAM335i
Registered
JAM335i's Avatar
0
Rep
4
Posts

Drives: BMW 335i
Join Date: Nov 2024
Location: USA

iTrader: (0)

Ok I’ll get a scanner, any recommendations on which brand/model?
Amazon has a lot of them:

- FOXWELL NT710 $190
- FOXWELL NT510 Elite $255
- ANCEL BM700 $120
- FOXWELL NT301 $70

Does it matter which one?
Thanks!!
Appreciate 0
      11-12-2024, 11:38 AM   #5
lookalikehuuh
Lieutenant Colonel
United_States
1032
Rep
1,545
Posts

Drives: 2006 330i, 2007 335i
Join Date: Sep 2014
Location: San Diego, CA

iTrader: (0)

Quote:
Originally Posted by JAM335i View Post
Ok I’ll get a scanner, any recommendations on which brand/model?
Amazon has a lot of them:

- FOXWELL NT710 $190
- FOXWELL NT510 Elite $255
- ANCEL BM700 $120
- FOXWELL NT301 $70

Does it matter which one?
Thanks!!
I personally don't have experience with any of these tools, I own the Autel MK808BT because of the wireless but that is twice the price of the tools listed here and it has a yearly subscription for tool updates.

After looking thru all the information on the page I would personally pick the Foxwell NT710 since it appears to be able to perform more functionality than the others. It should pay for itself pretty quickly if you own a BMW
Appreciate 1
      11-12-2024, 11:59 AM   #6
JAM335i
Registered
JAM335i's Avatar
0
Rep
4
Posts

Drives: BMW 335i
Join Date: Nov 2024
Location: USA

iTrader: (0)

Got the scanner, arrives tomorrow and I’ll update then. 1 more question:
Does fuel injector cleaner work? Worth trying?
Appreciate 0
      11-12-2024, 04:33 PM   #7
mainbearing
Lieutenant Colonel
1147
Rep
1,746
Posts

Drives: BMW 328i
Join Date: Apr 2019
Location: LA

iTrader: (0)

The high pressure reading should have been read before the HPFP was replaced, along with the reading on the low pressure side.

If the injectors are failing, even the new HPFP should be able to manage spec high rail pressure I think. So check those two pressure readings too.
Appreciate 0
      11-13-2024, 04:29 PM   #8
JAM335i
Registered
JAM335i's Avatar
0
Rep
4
Posts

Drives: BMW 335i
Join Date: Nov 2024
Location: USA

iTrader: (0)

Ok so here’s the codes:
  1. 29CF
  2. P0303
  3. A6CF
  4. A6A4

I think 1 and 2 are the same thing and the only area of focus for now.

What do I do from here?
Thanks!!
Attached Images
   
Appreciate 0
      11-14-2024, 10:35 AM   #9
Sgop335
Colonel
Sgop335's Avatar
United_States
669
Rep
2,082
Posts

Drives: 07 335i e92, 08 535i
Join Date: Jun 2014
Location: MD

iTrader: (1)

it is spelling out Cylinder 3.
IF correct plugs / gap/ coil are being used then that turns attention to fuel injector 3.
__________________
335i e92 TPC 19Ts
Appreciate 1
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 01:18 AM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST