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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 01-08-2015, 10:22 PM   #1
330xicanada
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My Ride: 2002 Bmw e46 330xi
330xi, poor fuel economy, rough idle, misfires and more

I purchased a 2002 330xi approximently 3 months ago, since then i have driven 4000 or so kilometers. Since the purchase the car has had a rough idle, i originally suspected the culprit was the Harmonic Balancer as that came up on my PPI, that did not solve the issue, then i had all 6 ignitiom coils changed, that did not solve the issue. The symptoms my car is experiencing is 1) Poor fuel economy (. worsening 80-50km per 1/4 tank) 2) CEL light is on and stays on 3) VERY rough idle when cold 4) intermittend rpm drop while at a stop (happens every few days) when accelerating after this occurs i feel heavy vibration in the accelerator (turning car off causes this to stop) 5) The codes: Random and multiple cylinder misfire, misfire on cylinders 1, 2 and 3 with fuel cut off, 02 sensor heater circuit bank 1 sensor 1, fuel trim bank 1 too lean. 6) occasionally the performance of the car feels dampended this could be paranoia caused by the codes, im not sure. 7) intermittent orange oil light when turning the car off. I have spend far more $$ getting it into good shape so avoiding another trip to the mechanic would be a god send. If any one is able to help me diagnose these issues it would be greatly appreciated, the Car has 264,000kms and is a 2002 automatic 330xi.
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Old 01-09-2015, 09:44 AM   #2
sk55
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Join Date: Sep 2014
Location: westchester
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My Ride: 330xi
did you try changing the spark plugs? check your air filter? check your battery? precat o2 sensors? use some sort fuel injection cleaner like lukas oil.


last time something similar happened to me it was my spark plugs and air filter. i used a fuel injector cleaner and i was good to go.
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Old 01-09-2015, 10:24 AM   #3
SamDoe1
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Your engine is running lean. Things to work on:

1.) Replace upstream O2 sensors, there are two
2.) Unplug MAF, turn car on and observe performance. If better, MAF is bad and should be replaced.
3.) Check for DISA noise (search around for this one), if noisy, replace.
4.) Remove lower intake elbow and check for cracks/tears/leaks/etc.
5.) Check rest of intake for the same.
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Old 01-09-2015, 07:13 PM   #4
330xicanada
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Join Date: Jan 2015
Location: Canada
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My Ride: 2002 Bmw e46 330xi
Thanks for your replies, do i need to replace both o2 sensors or just the one i have a code for? Where is my disa located? There is a slight rattle coming from under the hood.
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Old 01-10-2015, 07:37 AM   #5
Vitt03
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DISA valve is a rectangular black box located right next to the intake manifold, just behind the oil filter.
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Old 01-10-2015, 09:32 AM   #6
jfoj
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Quote:
Originally Posted by SamDoe1 View Post
Your engine is running lean. Things to work on:

1.) Replace upstream O2 sensors, there are two
2.) Unplug MAF, turn car on and observe performance. If better, MAF is bad and should be replaced.
3.) Check for DISA noise (search around for this one), if noisy, replace.
4.) Remove lower intake elbow and check for cracks/tears/leaks/etc.
5.) Check rest of intake for the same.
Lets just say this is some mis-information and the order of operations is not correct.

1. Upstream O2 sensors could use to be refreshed, BUT this should not be the #1 item on the list, probably should be the last at this point. Even though you may have a heater circuit out, the O2 sensor will still work, it just takes longer to come on line and this is NOT the cause of your rough idle, misfire or Lean codes.

2. Unplugging the MAF is not a valid test. Unplugging the MAF puts the DME into to a fail safe fuel MAP that is richer than normal and will COVER UP LEAN ISSUES. DO NOT REPLACE THE MAF AT THIS POINT. DO NOT THROW AWAY THE ORIGINAL MAF SENSOR IF IT HAS BEEN REPLACED. DO NOT REPLACE THE MAF SENSOR AT THIS POINT, IT IS NOT LIKELY A PROBLEM OR CONTRIBUTOR.

3. You can check the DISA, but keep in mind the DISA also has a large O-ring that leaks vacuum and will Lean the engine out.

4. Do not remove and inspect the intake boots, REPLACE them. Too much work to remove and inspect and IF they are originals, they NEED to be replaced.

5. You did not list OBDII codes or Freeze Frame data. Most likely misfires, misfire with fuel cut off and Lean codes. If you have Lean codes, the O2 sensors are working good enough for now, if they were not working properly you would not get Lean codes!

Read the first 3 links below in my signature. You need to verify the engine operating temperature as soft thermostats are VERY common and will kill fuel economy.

If you are warming the engine up in the morning, this will kill fuel economy. When the engine is running and the car is not moving, car will get 0 MPG!

6. CCV and hoses need to be replaced

7. Verify the power brake booster is not leaking vacuum.

8. Ignition coils were never likely the problem, hopefully the spark plugs were inspected/changed when the coils were replaced??

Also read my "BMW 20 Questions" comments, you need at least 15 of the 20 items addressed, but if you want a reliable car, do all 20!!

http://forum.e46fanatics.com/showthread.php?t=1059972
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 01-10-2015, 08:08 PM   #7
BROOKLYNUSA
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