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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 02-14-2012, 09:53 PM   #21
dslboomer
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I recommended to check spark plugs after getting codes to see if certain cylinders are having a problem. Wait till you get the codes.

Don't remove injectors. You will not able to see anything visually causing this problem.

You can get a stethoscope from Autozone or harbor freight.

http://www.autozone.com/autozone/acc...mString=search

Judging from the previous codes of 1084 and 1086, all cylinders are affected.
Possible causes:
1. Too much fuel pressure:
Rent a fuel pressure gauge from Autozone or Advanced auto part and measure the fuel pressure both at idle and higher rpm. It shoud be around 50 psi.
a) Check vacuum line going into the fuel pressure regulator at fuel filter. This vacuum line start at F-connector on the intake boot (right behind MAF). Plug one end and blow from the other side.
b) Did you change the fuel filter? Fuel pressure regulator may be bad if vaccum is okay.
2. Stuck open injectors
3. Bad MAF - you have new
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Old 02-14-2012, 10:11 PM   #22
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You can use a hose for stethoscope...5' of garden hose would work...you can get a rubber washing machine connection hose and just cut off the ends. Cheap and effective!
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Old 02-15-2012, 11:53 AM   #23
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I do have an extra fuel filter new in box, i'll try to replace that today. Now you mentioned the F-connection tube on the upper intake boot, you want me to disconnect it on the intake boot??? If i blow and its free than im guessing their is a leak???
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Old 02-15-2012, 12:15 PM   #24
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... the F-connection tube on the upper intake boot, you want me to disconnect it on the intake boot??? If i blow and its free than im guessing their is a leak???
Yes, exactly!
Fuel pressure regulator side should not leak.
Blow on the smaller diameter hose.

Last edited by dslboomer; 02-15-2012 at 12:25 PM.
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Old 02-15-2012, 12:32 PM   #25
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alright so i blew into that little hose, it wasn't easy to blow in but i was still able to get some air through.
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Old 02-15-2012, 01:23 PM   #26
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I wouldn't think the fuel pressure regulator would cause it...I broke that little F tube thing it hooks to last year and while I was waiting for the part I drove my car around for a few days without that thing connected and it ran just fine. Also you're getting a too rich code in both banks. That means something is causing it to add more fuel to all cylinders. Could be O2 sensors? Usually that's what causes too lean or too rich codes. My uncle just replaced one O2 sensor in his Tahoe with the same sort of symptoms as you and it has less then 30,000 miles on it. He went through all kinds of crap and that one O2 sensor did the trick. A vacuum leak could also give weird symptoms like that though. Does the car idle rough or anything like that?
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Old 02-15-2012, 01:27 PM   #27
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let me make a video for you guys
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Old 02-15-2012, 01:29 PM   #28
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... but i was still able to get some air through.
So you think there is a leak?
When in doubt, you can use this tool to test it. If it doens't hold vacuum, it is leaking. I am not sure Autozone has one for rent or not. You can call and find out.
http://www.autozone.com/autozone/acc...ier=70116_0_0_

If there is a leak in the system, you may have cut in vacuum line or leaking fuel pressure regulator.
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Old 02-15-2012, 03:22 PM   #29
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^^^ Well if i blow its not supposed to let any air go in what so ever or is it??? If its not supposed to let any air in than its defiantly got a leak. Here is a little short video of the idle and some revs. If you listen closely, when i rev and it drops back down it feels like the car is bugging down and about to die but than it regains. Sometimes white smoke will come from the exhaust, not a lot, and not while driving, just during idle a little bit comes out sometimes, but not always. Also their is some sort of black crap that comes from the exhaust. Don't mind the dirty car, I will give it a full on detail after i fix the problem and get the new bumper painted.

If I figure the problem out, i'm defiantly going to do a write up on this for other people if they experience the same. My garage door spring broke so waiting on the repair man to come by, as soon as he fixes it im going to change out the fuel filter and see if gets any better. Not going to hurt anything, not like i have to go to the stealership or order one. Got a new one in the box laying around so mind as well. Its about time to change it to.


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Old 02-15-2012, 09:26 PM   #30
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Alright guys, so I'm pretty sure i figured out why im getting the EML lights or at least why im getting the p1084 and p1086 engine codes. As I got under the car to change the fuel filter, I noticed one of the tubes was broken off and disconnected. I think its the tube that connects to the upper intake boot. The tube that you told me to blow through dslboomer. Now does anybody know the part number for the tube??? it's not just a regular rubber tube, this one has a metal lining inside.





Alright now I also noticed an empty spot here. Is this normal ?? or is their supposed to be another tube here?????
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Old 02-15-2012, 09:38 PM   #31
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I think this is the part number?????

13327561060
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Old 02-15-2012, 10:37 PM   #32
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Originally Posted by PRDesignsTony View Post
...As I got under the car to change the fuel filter, I noticed one of the tubes was broken off and disconnected. I think its the tube that connects to the upper intake boot....

... now I also noticed an empty spot here. Is this normal ?? or is their supposed to be another tube here?????
Excellent!
Glad to see that you followed through and put efforts to take pictures to share with us.

Hard to match the part number in the realoem.com. Illustrator got lazy on many parts I found. It doesn't have a metal liner. It is 90 degree elbow vacuum hose that was broken off from the vacuum port of fuel pressure regulator. Just take the fuel filter with you to Autozone to get a 90 deg elbow with matching diameter.

You are not missing anything in the clip. It is empty spot there.
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Old 02-15-2012, 10:49 PM   #33
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awesome defiantly gonna had out to autozone tomorrow, get that elbow, didn't think of that for some reason lol. I will give you guys an update tomorrow. I really hope this fixes my issue, I will replace the old fuel filter with a new one while im at it.
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Old 02-16-2012, 01:00 PM   #34
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Was really hoping that was going to be my fix. But nope. The light still comes up and car drives funny, still hesitates at times. This problem is starting to piss me off.

Just called the shop that diagnosed it was a CCV thats was cause my issue. Waiting on a call back, Gonna ask how much they charge to just read the codes.
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Old 02-16-2012, 02:08 PM   #35
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Originally Posted by PRDesignsTony View Post
Was really hoping that was going to be my fix. But nope. The light still comes up and car drives funny, still hesitates at times. This problem is starting to piss me off.

Just called the shop that diagnosed it was a CCV thats was cause my issue. Waiting on a call back, Gonna ask how much they charge to just read the codes.
I kinda thought so. Like I said, I drove around for a week with that hose disconnected and never even noticed a difference, Its still good you found that though. I'm putting my money on O2 sensors.
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Old 02-16-2012, 02:26 PM   #36
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you can just get hose by the yard from autozone etc, same stuff. and like $1
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Old 02-16-2012, 02:44 PM   #37
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*** Opening statement - I don't know all of the ins and outs of BMW engine management systems *****

However, have you cleared the adaption values?

When things start to wear out or go south, the car learns and readapts. It can readapt short term and long term fuel trim to account for minor vacuum leaks, aging O2 sensors, etc.

One long shot here....you may have already fixed the problem, but the adaption values are still in play making the engine run poorly. A dealer or an independent can reset these adaption values for you.

Also, a couple ideas to test for a vaccum leak:
1. Remove the air filter box and insert a paint can or coke can in the intake hose, clamp it tight.
2. Remove the F pipe. Now lean down and blow hard into the opening on the intake hose where the F pipe was. Listen for leaks. Imagine trying to blow up a balloon.
3. Now blow into the F pipe and listen for leaks.
4. Put the car all back together.
5. Now remove the front crankcase breather hose on top of the valve cover
6. Blow into the hose and listen for leaks. You should hear oil in the pan bubbling from your blowing. If not, you have an obstruction in the CCV system.

Good luck.
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Old 02-16-2012, 03:52 PM   #38
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^^^^ Just replaced the CCV system. Intake boots are new to, don't have any holes. I'll see if I can find someone to reset my ECU
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Old 02-16-2012, 04:32 PM   #39
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Originally Posted by PRDesignsTony View Post
Was really hoping that was going to be my fix. But nope. The light still comes up and car drives funny, still hesitates at times. This problem is starting to piss me off.

Just called the shop that diagnosed it was a CCV thats was cause my issue. Waiting on a call back, Gonna ask how much they charge to just read the codes.
That was discouraging
However, you got to enjoy fixing E46 problems because that's a half of the fun owning E46 aside from nice handling

You seem very handy with cars judging from amount of time you ttook to complete jobs. I highly recommend to get a decent code scanner if you want keep your BMW longer.
Please clear the codes and get the codes when CEL comes back, and let's go from there.

To reset adaption value, remove the negative battery terminal for 15 minutes. However, that will not erase CEL.

Last edited by dslboomer; 02-16-2012 at 05:23 PM.
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Old 02-16-2012, 04:52 PM   #40
PRDesignsTony
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Yea I know a lot about working on an e46 engine, I've owned 3 e46's, had to fix each one of them. I love working on my cars, its fun, just don't like to spend the money lol but its better than going to a shop or a dealer lol. I really do need to invest in a good code scanner. I got a VW Golf thats been giving me trouble lately as well, but i just ordered a few parts for it. 167k miles on the golf and she still strong as ever.

I reset the values right now, i'm having a friend hook his laptop to the car around 6pm tonight to pull the engine codes and gonna clear them.
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