Increased emissions? gah.
So, my car is a 2004 545i with 182K miles
Most mornings where it's cold outside (under 40*F or so) the idle is a bit erratic and it seems to run a little rough at first (but starts fine), but after I get out of the driveway and give it some gas it does just fine, and is fine for the rest of the day after that and throws no error codes, except for two times where I've gotten some errors.
First time was maybe a month ago where I can't even remember all of the codes that came up, but I remember it running and sounding horrible. From what I remember reading after it happened, the car had switched away from using valvetronic and was using the regular throttle body it had so many errors. This happened as I was pulling out of the driveway, and when I accelerated to leave it was very weak and sounded like an old tractor or something it was so bad. I pulled over maybe half a mile down the road, turned the car off, re-started it and all errors were gone and that hasn't happened again.
Fast forward to today and as I was pulling out I got an increased emissions warning message. It still ran fine, but I tried pulling over/turning the car off anyways, but the message was still there when I restarted.
I drove to my parents house about an hour away to drop the dog off with no other issues in driveability, and pulled all the codes in INPA. I've attached a printout from that, but basically it's the following:
27A0 (ebox fan, this one has been there forever--I just need to order a new one and replace it)
274E (Misfire detection, Checksum failure)
2747 (misfire detection cyl. 3)
2748 (misfire detection cyl. 7)
2742 (misfire detection cyl. 1)
2743 (misfire detection cyl. 5)
2744 (misfire detection cyl. 4)
Any ideas on what to replace? I remember seeing a service bulletin about some of the valvetronic components being out of spec one time but I can't remember if all the symptoms were the same or not. I'm not sure why it only does it when it's cold and is fine the rest of the time.
Oh, spark plugs were changed a few months back so those are all new.
I have already ordered CCV rebuild kits prior to this, so I'm going to make sure those are working properly but I'm not sure what else to do. I keep reading about the DISA valve, but I can't find anything about that on the V8's, only on the V6's. Is this something I have or no?
Thanks for any help!!
Did you ever figure out what needed to be changed? I have the same error message. I was told that my MAF sensor may be the culprit. I would just hate to buy a new $200 MAF sensor just to find that the error doesn't go away.
I connected my scan tool, and some of the errors that it pulled are:
27C3 Thermal Oil-level Sensor (don't think this is related)
276D Function check, Tank Ventilation
2882 Fuel Trim, Bank 1
2883 Fuel Trim, Bank 2
Are those the only codes? I have never seen a fuel trim error on mine.
I would think fuel trim errors would be related to vacuum leak(s) and/or O2 sensor issues.
I never did figure out what mine is caused by--the weird thing is it runs PERFECT if it's under somewhere around 25*F outside. It's only when it's right around freezing that it goes all crazy. Above somewhere around 40* it doesn't do it either. Very strange
I have cleaned my MAF but haven't tried replacing it. I know there is some sort of switchover that the valvetronics system does the first 90 seconds it's running. If I understand it correctly, the valves are actually opening all the way (like a normal engine) when it's first started and the computer uses the throttle body to control RPM. Then it makes the switch over from throttle body to valvetronics.
I need to do some more googling and make sure that's correct and how it actually does it, but I feel that mine is related to something in that process, I'm just not sure what exactly..
Well that's the only codes that came up in the DDE (Diesel Electronics)and DME(Digital Motor Electronics) scanner menu. There were other codes that I found, but I don't think they are related to it. Here are the other codes:
-276D Function Check, Tank Ventilation
****IHKA (Intergrated Automatic heating/AC control) and IHKA2 (Interfrated Automatic heating/AC
-9C54 AUC (probably need to buy a new AUC sensor on fan shroud- PN:64116933052)
-9C77 Refrigerant compressor (*** i think it could be low on freon****)
-00,01,A5,57 No Found!
-A3B9 Dynamic Stability Control, Comunication Fault
Gotcha.. mine matches the description in the service bulletin below, but I'm outside of the date range they have listed, I think anyways. Mine was a December 2003 build, but I think it was early December and this says it doesn't apply to anything that early.
However, I wonder if the high mileage on mine has worn something in the valvetronics system to the point that it's basically doing the same thing? I'm at 187K now
edit: I just checked the build date on mine, and I'm at 12/16/03. I have a hard time buying their hard cut off of the last two days for 2003 though. I work in the automotive industry and it just sounds like a supplier had to give a cut off date of when they could have and couldn't have shipped bad parts, so that is the date they went with, wrong or right. The symptoms are dead on though otherwise.
I have under 110k on my 2004 525i which has a production date of 11/2003. I'm sure if I went in with this bulletin they would find a way NOT to have to do this without first requiring me to pay a $250 diagnostics fee to see if there are any other underlying issues. Nice to have an older Bimmer eh?
I left my laptop in the car last night so I could at least try to get some information on what was going on this morning when I started it, but of course I was running late for work and didn't get the laptop booted up until I was out of the parking lot, then the battery died on the laptop, so I didn't really get any new info, gah
Before it died I did see something about the air density that was completely off the charts, so I need to investigate that more. It may have been completely normal but it was definitely off of the scale that INPA had
For anyone reading, someone else suggested changing the minimum valve opening to 0.8mm instead of the factory setting of I believe 0.3mm. Mine was already changed to 0.8mm for whatever reason, so I was not able to change that
Hopefully that helps someone else though in the future.
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