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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 12-26-2016, 12:40 AM   #1
Adam E46
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Join Date: Dec 2016
Location: Houston Texas
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My Ride: BMW 330CI 2001 e46
BMW Missfire E46 M54

thank you for reading, I am new to BMW e46 fanatics!


I have a 2001 330CI e46 M54 that I have owned for two years.

The vehicle drives like a charm until it starts to missfire then, I lose tourqe and power and the engine starts shaking and Rev becomes unstable on Idle.

This used to happen rarely on IDLE when im at red light or warming the car up turning the car off and back on would stop the missfire,

I took it to more than one mechanic for suggestions, Changed all 6 sparkplugs and 6 coils, also fuel Filter and vaccum hose to fuel filter regulator. inspected intake and intake hose for leaks but non.

after those replacments The missfire stoped and Mil Light would turn off only on highway steady high speed (55 to 65 miles/h) then would come back on on IDLE. Next day Boom Im stuck with constant Missfire along with extremly reduced tourque and horsepower.

I have uploaded a video to show you the sound of the ending muffler exuast on Missfire.

I have spent alot of money to solve this issue and I am up for it but I just want to identify this issue first and make sure so I wont waste more time or money on something that doesnt need service.


codes i am getting ( from autozone) :
P0174 System Too Lean (Bank 2)
P0171 System Too Lean (Bank 1)
P0313 Missfire Detected With low Fuel x2
P0300 Random Misfire detected x2
P1343 Missfire Cylinder 1 With Fuel Cut off
P1345 Missfire Cylinder 2 with Fuel Cut off
P1347 Missfire cylinder 3 with fuel Cut off
P1349 Missfire Cylinder 4 with fuel cut off
P1351 missfire cylinder 5 with fuel cut off
p1353 Missfire cylinder 6 with fuel cut off





any suggestions would be really appreciative.

Link to Video ( please excuse my poor video recording it was late at night after some detailing
_a_
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Old 12-26-2016, 10:38 AM   #2
markusmarkus
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The first thing is to test the fuel pressure at the fuel rail. See item #2 in the link. It's the cap on the fuel pressure test valve.

http://www.realoem.com/bmw/enUS/show...diagId=13_0900

Pressure has to be at least 45psi at all engine speeds.

Does the car have the original fuel pump? I bet it does. The pump needs to be replaced if it's original. Buy a Siemens/VDO pump and a fuel filter made by either Mahle or Keyser.

Have the intake smoke tested for vacuum leaks. The P0171/0174 codes are caused by vacuum leaks. A smoke test is the ONLY way to find all of the vacuum leaks.

Lastly, find another mechanic. Don't throw parts at a problem. Doing so wastes money, doesn't fix the problem and angers the BMW goddesses.


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Old 12-26-2016, 11:03 AM   #3
Poolman
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Interesting fix here
http://www.bimmerfest.com/forums/sho...d.php?t=957506
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Old 12-26-2016, 11:05 AM   #4
jfoj
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Fuel Pressure spec is 50 PSI.

Suggest your read these links:

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

Need warm idle Fuel Trims and Freeze Frame data.

Could be a fuel pressure problem, I suggest EVERY E46 have the fuel pump replaced at this point, but there could be a bad sensor, vacuum leak or O2 sensors connected wrong.

This is REALLY not that hard.

Search my user name, we have un-f**ked so many cars online here it is not even funny.

Most "mechanics" are marginal at best. You can see from what your mechanic did, the engine probably could have used spark plugs, but they were not likely the source of the problem and clearly the coils were not the source of the problem either. "inspected intake and intake hose for leaks but non." Well you cannot "inspect" for vacuum leaks successfully, if you "inspect" for vacuum leaks and find them, you are LUCKY!

I bet they did not smoke test the intake and crankcase for air leaks.

You can do this yourself for less than $20.





http://forum.e46fanatics.com/showthread.php?t=1115860

Cheap fluid transfer pump from your local auto parts store or Amazon.

http://www.amazon.com/ABN-Multi-Use-...fer+pump&psc=1

A few rubber gloves, rubber bands and some cheap mini cigars from our local gas station or convenience store. You can also use a cheap E-cigarette and it may be safer than a lit cigar as well. Not sure if you can use mineral oil in the E-cigarette or if this would be to flammable.

Also get a good, bright LED flashlight to locate the escaping smoke. Look deep in the engine compartment and under the engine if needed. Do not forget the dipstick guide tube and the lower CCV oil return line. These areas may be hard to see from above in the engine compartment.

After looking for intake air leaks, remove the oil fill cap and allow the crankcase to fully fill up with smoke, then replace the oil fill cap. Check for cracks in the valve covers and leaks around the grommets, half moons and around the perimeter of the valve cover.

Common areas of leaks:

Upper and lower intake boots
Upper intake boot around F connector
DISA main O-ring and shaft area
Vacuum hoses under the rear of the intake
Fuel pressure vent hose that connects to the F connector on the upper intake boot and under the drivers floor board where it connects to the fuel pressure regulator
CCV and hoses, especially the lower oil return line
Dipstick and dipstick guide tube
Oil fill cap
Valve cover gaskets and cracked valve covers
SAP vacuum line to Kombi valve on front of engine, this will not leak smoke because of the control valve under the rear of the intake
Power brake booster sucking jet pump and hoses.

Note that the brake booster usually cannot be smoke tested because of the input vacuum check valve at the booster connection.
__________________
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

Last edited by jfoj; 12-26-2016 at 11:08 AM.
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Old 12-26-2016, 11:34 AM   #5
Ne70
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is the DISA valve, the same problem with my e46

try a new DISA valve (for some reason sometimes the vacumm of the DISA stop working properly)
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Old 12-26-2016, 11:47 PM   #6
Adam E46
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first off thank you all for your replies.

After a long day at work, I managed to take a look and inspected the following:

Coil plugs removal and reinstalled, tested coils each indicated 12V
smoke test which resulted with no leak from the front engine or intake boot.
sprayed some carb cleaner while the boot was off.
changed the oil to find that my mechanic had more than 7 quarts of oil in my 6 cylinder 6 quarts engine -.-, this may have had a huge impact on the car's performance..
I applied some injection cleaning to a full tank of gass to clean the engine from the excess oil

DISA Adjuster Unit looks like it was a rebuilt model or repaired as it was surrounded with a layer of silicon around the outer gasket, I thought it might need a new gasket or is leaking so the poor mechanic applied this silicon to prevent it form leaking.. there was no smoke coming out from the DISA during smoke test so i didnt take it out worring it might need to be replaced soon/ suggestions?


after checking all these, The car starts with no shake and no rough unstable idle anymore !!!, however still has little miss fire with rumbling noise from muffler.
I hope this is progress.


Under the car I have found two loose hoses, one coming from some sort of vase and other one is hard to track to the top but possibly engine? , "The vaccum hose to regulator is connected and inspected"
please check my video and help me find what these two hoses are and where they are supposed to go lol

As i mentioned earlier I am pretty new to all this but im known to be able to cape in anything, this car is slowly becoming my everything lol.
I really appreciate everyone here on this forum trying to help new comers like me find there path with the bimmer.

link:
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Old 12-27-2016, 09:54 AM   #7
markusmarkus
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The engine - an M54B30 to be exact - takes 6.9 liters of oil. I put 7 quarts of oil in the engine when I change the oil and filter.

The smoke test wasn't performed properly as the P0172/0174 codes are almost always from vacuum leaks. Have the intake smoke tested by a shop that specializes in BMWs.

jfoj, you are correct, the spec is 50psi.
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Old 12-27-2016, 10:10 AM   #8
brea
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That one line going into the canister is for the exhaust flap
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Old 12-27-2016, 12:51 PM   #9
Adam E46
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I'll take it for a smoke test this thursday.
@brea, thank you for that info i will try to reattach to exhaust flap and let you know
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Old 12-27-2016, 01:46 PM   #10
jdstrickland
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This just in, Princess Leia has passed.

Now, back to our regular programming. You have a car that's running lean, and perhaps firing issues with the spark plugs. If the engine pumps raw fuel into the CATs, this is very bad for them so the computer will shut off the fuel supply -- injectors.

A misfire is defined as, "the expected work was not performed." This means that if the firing order is 153624 then when 1 fires, 5 must fire within a specified period else cylinder 1 misfired. On a lean condition, the active combustion might not be sufficient to move the crankshaft from 1 to 5 as quickly as it should, but the event should not be one of raw fuel coating the insides of the CATs. I'm wondering if there is an ignition issue as well as a lean condition. Hmmm.

I agree with the advice so far, fix the lean first. You cannot make any other diagnostic decisions without curing the lean.

My thoughts are that the lean condition would give as much combustion as it could, therefore the fuel cut-off would not be needed. Since there is a fuel cut-off then the computer is breathing gasoline in the CATs, and it does not like to do this. Fuel cut-off is an attempt to protect the CATs.
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Old 12-27-2016, 03:19 PM   #11
jfoj
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Quote:
Originally Posted by Adam E46 View Post
I'll take it for a smoke test this thursday.
@brea, thank you for that info i will try to reattach to exhaust flap and let you know
The car is a 2001, it is 15 years old.

If the CCV and hoses are original, they need to be replaced, period and end of story.

Did you pull the airbox off and find the hose that connects to the base of the dipstick tube? If this hose is soft and covered in oil, it is probably split/broken. The problem is it often has a foam cover on it, so it is hard to know for sure if it is broken.

Proper smoke testing requires you remove the oil fill cap, make sure the crankcase fills up with smoke, then re-install the oil fill cap.

Keep pumping, look for smoke BELOW the engine and near where the dipstick tube goes into the crankcase. You were under the car, I usually just tug on the CCV lower oil return line not super hard, but firmly, if it breaks, you know it was bad!!

Sometimes you need to remove the coil cover on top of the valve cover to look for leaking Valve cover gaskets and grommets.

But if you could provide Freeze Frame and Fuel Trim data, this would be less of a guessing game as well.
__________________
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 12-28-2016, 12:03 AM   #12
Adam E46
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thank you Jfoj,

I believe the CCV and hosses are orignal,

https://www.oembimmerparts.com/BMW-E...ShoppingEngine

link to CCV and its components

I will do smoke test again this Thursday and find where the leak is.

however what about that loose hose coming up from the engine ?

Is it dangerous for the engine to be driven in this state ?

Last edited by Adam E46; 12-28-2016 at 12:05 AM.
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Old 01-10-2017, 03:38 PM   #13
FL.325.Ci
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jfoj how do i get the freeze frame fuel trim data? Do I need a scanner tool?
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Old 01-10-2017, 10:39 PM   #14
TheRocketSurgeon
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As others have mentioned look for vacuum leaks. There are vacuum hoses running all over the place, so be very thorough in checking them. Any air getting into the intake after the MAF will cause pretty much all of the codes you mentioned. The most common is the intake elbows. After that I would inspect all those hard plastic tubes in the region (like the ones running to the CCV). Then start inspecting every vacuum line you can see. When I first bought my car there were several lines that were just severed. There are a couple of lines on the other side of the engine too near the secondary air pump so make sure to look around there as well.

FL325 you will need some kind of a scanner tool.. My $20 bluetooth OBD2 adapter can get fuel trim data so you don't need anything too fancy.
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Old 01-10-2017, 10:53 PM   #15
jfoj
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Quote:
Originally Posted by FL.325.Ci View Post
jfoj how do i get the freeze frame fuel trim data? Do I need a scanner tool?
Scan tool is required for Freeze Frame data and Freeze Frame data will only be available while the SES/CEL/MIL is still on. If you clear codes, it will clear the Freeze Frame data.

The OBDFusion App is what you want, less than $10.

You will need the VeePeak interface from Amazon.

Android requires this interface - https://www.amazon.com/Veepeak-Bluet...peak+bluetooth

iProducts requires this interface - https://www.amazon.com/Veepeak-Scann...s=veepeak+wifi
__________________
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 01-11-2017, 09:14 AM   #16
markusmarkus
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My guess: the fuel pump is soft failing.


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Old 01-11-2017, 01:48 PM   #17
swordsman11868
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Adam: how many miles on the odo?

If over 150k then definitely could be fuel pump failure, unless you know for sure it has been replaced.


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Old 01-11-2017, 06:14 PM   #18
Adam E46
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FIXED!!

First off I would like to thank each and everyone on responding to my thread,

after a long day at work and next day being off, I went to the garage and started a night job on my E46.

I did the following:

Removed and cleaned the Adjuster unit and ICV
Inspected CCV to find that it wast obviously not the original because the hoses were very lean and not hard or dried up. " no smoke with smoke test"
Tested each coil resistance @ 0.8ohm " Coil #1 was faulty" *replaced*.
removed and cleaned all fuel injectors.
disconnected all electrical connections and reconnected.
removed the intake air temperature sensor electrical connector and cleaned it ( was full of dust and very dirty!!!) I have a feeling this was the main reason along with the faulty coil.
------------------------------------------

After doing all that, I crossed my fingers and started the engine and BAM ! smooooth engine like i never hear'ed before. I'd say about 40~50% of engine power restored. YES 40~50%, Its like i was driving a honda and now I am really driving a BMW E46!

the best part is that I didnt have to take it to a mechanic.

Service light is still on, I inspected the Secondary air pump to find that it is dead as well ( using a 12V circuit) , next step is to change the whole secondary air system and pour some seafoam in there to clean the engine from the inside.

also changing the O2 sensors might help eliminate the Engine light.

but for now the car is driving like a charm!
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Old 01-11-2017, 08:18 PM   #19
jfoj
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Do not count your chickens yet.

I am not seeing what you did fixed Lean Codes on BOTH banks and misfiring on ALL cylinders.
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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 01-11-2017, 08:49 PM   #20
TheRocketSurgeon
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Those are all great things to have done, but I have to agree with jfoj that you might not be in the clear just yet. A misfire on all cylinder combined with lean fuel code is indicative of two possibilities. You either aren't getting enough fuel and its running lean (failing fuel pump or possibly very dirty fuel filter) or you have air entering the combustion chamber unmetered. If you have air entering into the system after the mass air flow sensor you will begin running lean and causing misfires. You can quickly rule out the fuel problems by checking fuel pressures at the rail. Trying to track down exactly where you are leaking air in is always a tedious task. If you removed the DISA did you replace the oring around it? You will want a number 136 silicone oring to replace that.

As for your secondary air pump it is possible to delete those and if you have an ms43 ecu you can flash it pretty easily and remove the check engine light. I will not say one way or the other that this is the way you should go, just throwing it out as a possibility.
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