|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
Rough idle on warm start
|
|
10-06-2020, 03:52 PM | #1 |
New Member
0
Rep 5
Posts
Drives: 2008 BMW 335xi AT
Join Date: Oct 2020
Location: Aiken, SC
|
I recently bought a 2008 335xi sedan A/T. The car runs fine most of the time, but always shudders hard on a warm start. The rpms also fluctuate around 600 on warm start. I've also noticed the car feels a bit sluggish but that could just be me not really knowing the car yet as I just got it. When I check to dme codes with mhd I get the following:
29CD- DME: Combustion misfires, cylinder 1. 2A17- DME: DMTL, system fault 2C40- DME: Oxygen sensor 2 before catalytic converter: Signal lines 2C9C- DME: Oxygen sensor heater before catalytic converter: Activation 2C9D- DME: Oxygen sensor heater 2 before catalytic converter: Activation 2C9E- DME: Oxygen sensor heater after catalytic converter: Activation 2C9F- DME: Oxygen sensor heater 2 after catalytic converter: Activation Took the car to an independent mechanic shop in my area for an oil change and inspection. They told me that the plugs, coils, and o2 sensors are all in good shape. They think it's something to do with the wiring for the 02 sensor. They asked me if I wanted to leave it with them for another few hours but at 100$ an hour I figured I'd just try to figure out the problem on my own and come back. Since the plugs, coils, and o2s are all good, what else could be causing the shuddering? What would be my best course of action here? The car is completely stock btw. I plan to go FBO at some point but I want to get the care running well before I go down that road. UPDATE: swapped the 1 and 2 coils. coil 1 had lots of whiteish buildup inside it. blew most of it out with a compressor. i have no idea what the buildup was, if anyone knows anything about that i would really appreciate any insight. coil 3 was also a little loose, so i made sure all were seated properly and cleared the codes. went for a drive, cut it off, waited about a minute, and started it back up. the cel is back and the shuddering is still present but it seems so stop after a few minutes of running. checked the codes again and it the misfire is gone!! the other codes regarding the o2 sensor are still there so im thinking the shuddering must have to do with that. if any of this means anything to anyone please let me know. im planning on replacing all coils and plugs soon so will update when thats done. |
10-07-2020, 09:18 AM | #5 |
New Member
0
Rep 5
Posts
Drives: 2008 BMW 335xi AT
Join Date: Oct 2020
Location: Aiken, SC
|
|
Appreciate
0
|
10-07-2020, 09:30 AM | #6 |
New Member
0
Rep 5
Posts
Drives: 2008 BMW 335xi AT
Join Date: Oct 2020
Location: Aiken, SC
|
|
Appreciate
0
|
10-07-2020, 09:32 AM | #7 |
New Member
0
Rep 5
Posts
Drives: 2008 BMW 335xi AT
Join Date: Oct 2020
Location: Aiken, SC
|
will hopefully have time to look under the hood this weekend. ill be sure to update my original post afterwards
|
Appreciate
0
|
10-07-2020, 09:33 AM | #8 |
Lieutenant
242
Rep 494
Posts |
No idea. That's why I haven't checked yet. My car isn't throwing any codes
|
Appreciate
0
|
10-12-2020, 09:20 PM | #11 |
First Lieutenant
139
Rep 333
Posts |
Have you checked your fuel pressure regulator below the back seat for cracks in the plastic or checked your fuel pressure? You may not have codes for this.
|
Appreciate
0
|
Bookmarks |
Tags |
335xi, e90, rough idle |
|
|