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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 10-02-2013, 07:10 AM
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Misfiring after Intake Port Cleaning!

So I just cleaned my valves with carb cleaner and seafoam. I used a brush and vacuum to clean the valves out. Not much if anything fell in the cylinders maybe a few drops.

None of the coil packs broke that I know of and I replaced the intake manifold gaskets.

It fired right up no issues. Then when I am driving it sounded like a weird swoosh sound however the cowl is still off at this point Simi am not sure.

As soon as I enter WOT and try enter boost the car starts sputtering.

I got a check engine light and it said cylinder number six misfire. So I took the coil pack and the spark plug from cylinder number six and moved to cylinder number one.

I reset the PCM via pressing the gas pedal for 30 seconds and then holding it for another 30 seconds while pressing the start stop button.

I also use my OBD to scan tool to reset the code.

I took it out for another drive and now I'm getting p0300, P0301, P0304.

Again this only happens during wide-open throttle if I drive normally nothing happens even if I hold my RPMs in first gear at 4000 RPMs, or I drive slowly at partial throttle there's no issues.

What could this problem they please help thank you!


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  #2  
Old 10-02-2013, 07:20 AM
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thekurgan thekurgan is online now
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You cleaned your valves or you cleaned the throttle body plate? If you just sprayed that crap into your engine, my guess is you now need new spark plugs; cylinders 1 and 4 would be the plugs I would compare with the others.
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  #3  
Old 10-02-2013, 07:36 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by WhiteFury View Post
So I just cleaned my valves with carb cleaner and seafoam.

I took it out for another drive and now I'm getting p0300, P0301, P0304.

So, misfire Cyl's 1 & 4. Generic - do you have a OBDII code reader that can display BMW codes?

Poss air inleakage! Best check that intake plumbing.............
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  #4  
Old 10-02-2013, 08:49 AM
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Misfiring after Intake Port Cleaning!

I used a vacuum to suck it out and everything looks clean. I started the car and let it run a bit then shut it off and put in all new plugs.

I tightened down the intake manifold well and checked all wiring and nothing. Even when I replaced cylinder 1 with my old plugs which were not misfiring, I am still having misfires.

So I just removed the intake manifold again to clean the surface where the gasket seats.

Should I replace the studs and nuts for the manifold


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  #5  
Old 10-02-2013, 08:50 AM
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You are misfiring on random cylinders, p0300. Check for leaks & since you moved the coils around & added to the misfires, did you seat them properly? Are you torqueing the bolts or just doing it by feel?
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  #6  
Old 10-02-2013, 03:02 PM
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Misfiring after Intake Port Cleaning!

I'm doing it by feel.

I was getting misfires in cylinder 6 and when I tightened the manifold it went to random or cylinder 1.

Then I tightened a bit more and the CEL stopped but it still sputters in boost.


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Last edited by WhiteFury; 10-02-2013 at 03:04 PM.
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  #7  
Old 10-02-2013, 05:21 PM
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You do not want to be working on an alloy engine without a torque wrench. Could be a mis-seated gasket or you are warping the piece with uneven torque on the bolts. If it was running OK before you did the walnut blast it pretty much has to be something you have done. So you need to go back over all your steps to be sure everything is OK
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  #8  
Old 10-02-2013, 05:40 PM
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Misfiring after Intake Port Cleaning!

I have an inch pound torque wrench. What is the torque specs on it? Any bolt pattern?

I usually start center and then left of center, then right of center, the. Outer left and then outer right.

Sound right?


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  #9  
Old 10-02-2013, 06:20 PM
Ilovemycar Ilovemycar is offline
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Quote:
Originally Posted by WhiteFury View Post
I have an inch pound torque wrench. What is the torque specs on it? Any bolt pattern?

I usually start center and then left of center, then right of center, the. Outer left and then outer right.

Sound right?


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Not sure which engine you have, not that it makes a difference, but I googled "N54 intake manifold torque spec", and this was the first search result....

http://www.n54tech.com/forums/showthread.php?t=12258

Never having worked on an engine before outside of the most basic maintenance, I'm guessing I didn't find the specs you were looking for. You might consider picking up a Bentley manual, the engine section has a torque spec for damn near everything, enough to almost make your head spin.
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  #10  
Old 10-02-2013, 08:31 PM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by WhiteFury View Post
I have an inch pound torque wrench. What is the torque specs on it? Any bolt pattern?

You have a BMW - best to spend some money.

Excellent start:

THIS

THIS


Torque plus angle required on some bolts. Some should not be used twice. Trust Bentley - buy quality tools and follow procedures on BMW's - you'll do much better.
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  #11  
Old 10-02-2013, 09:18 PM
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Misfiring after Intake Port Cleaning!

Links aren't visible and in the email I can see them but the tool link is dead.


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  #12  
Old 10-02-2013, 10:18 PM
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Misfiring after Intake Port Cleaning!

Started car and cylinder 3 misfire. Took out old plug and replaced with one new plug.

Still can't enter boost at all. This is very annoying.


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  #13  
Old 10-02-2013, 11:06 PM
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Originally Posted by WhiteFury View Post
Links aren't visible and in the email I can see them but the tool link is dead.


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Links working here....try these instead:

http://www.bentleypublishers.com/bmw...ir-manual.html

http://www.gearwrench.com/torque-wre...50-in-lbs.html
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  #14  
Old 10-02-2013, 11:36 PM
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Misfiring after Intake Port Cleaning!

Thanks.

Is it possible i have a bad coil pack or injector?


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  #15  
Old 10-03-2013, 08:31 AM
jburke4689 jburke4689 is offline
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Extremely high probability that your problem is related to what you did. The intake bolts are tightened to 11 pound/feet and you cannot do that low a torque by "feel." You will always overtorque them. That can crack or deform the plastic manifold creating an air leak. There is a connector on the underside of the intake manifold and one on the top. Are you sure you seated the connectors. They measure pressure in the manifold. Also, one or more of the o-ring seals in the manifold could have come out of the groove when you were reattaching the manifold.

You really need to go back over what you did to fix this problem.
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Old 10-03-2013, 09:34 AM
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Is it possible i have a bad coil pack or injector?

Of course! But prob not....looks like you'll be doing a re-disassembly for inspection and re-assembly with good parts to torque spec.

Bentley - I have one, an invaluable resource!

Online the Gold Standard's www.alldata.com
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  #17  
Old 10-03-2013, 09:42 AM
fdriller9 fdriller9 is offline
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Have the DME adaptations reset.
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  #18  
Old 10-03-2013, 11:22 AM
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Misfiring after Intake Port Cleaning!

I reset adaptions and no good, unless I did it wrong but i doubt it.

I removed the intake manifold and bolted to spec. I connected the lines under the manifold and I also installed new gaskets as well.

As of last night still can't enter boost.

I also cleaned both surfaces well.

Also I am not sure if it was a coincidence but when I went back and started snugging down the intake manifold the first time the boost built properly a few times before misfiring.
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Last edited by WhiteFury; 10-03-2013 at 11:35 AM.
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Old 10-03-2013, 02:35 PM
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Misfiring after Intake Port Cleaning!

Car is being diagnosed by the dealer right now. I hope they find what happened.
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Old 10-03-2013, 03:51 PM
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Car is being diagnosed by the dealer right now. I hope they find what happened.

Guessing you're out of time on this one....that'sa big honkin' pill t'swallow!

On resolution, please post - image of the service record just right....
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Old 10-03-2013, 03:55 PM
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Misfiring after Intake Port Cleaning!

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Guessing you're out of time on this one....that'sa big honkin' pill t'swallow!

On resolution, please post - image of the service record just right....
What do you mean but hard pill? Lol and why post the service record is the dealer going to lie to me?

They said 2 hours diagnostics so I am looking at $290 plus whatever parts.
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Old 10-03-2013, 04:58 PM
surfcity335i surfcity335i is offline
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is the dealer going to lie to me?
Wouldn't be the first time.

The hardest car to fix is the one someone else has already been monkeying around with. May the Schwartz be with you.
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  #23  
Old 10-03-2013, 06:49 PM
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Misfiring after Intake Port Cleaning!

I did everything correctly. I know it's going to be something else and it's my luck it happened at this exact point in time.
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  #24  
Old 10-03-2013, 06:59 PM
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What do you mean but hard pill? Lol and why post the service record is the dealer going to lie to me?

They said 2 hours diagnostics so I am looking at $290 plus whatever parts.

I mean taking it to the dealer's like choking down a horse pill. Arrrrrrrrrrrrg....

Interested in how the dealer writes it up - hey, give us a show - delete dealer's name/addr if you like.
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Old 10-03-2013, 07:07 PM
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Misfiring after Intake Port Cleaning!

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Originally Posted by CALWATERBOY View Post
I mean taking it to the dealer's like choking down a horse pill. Arrrrrrrrrrrrg....

Interested in how the dealer writes it up - hey, give us a show - delete dealer's name/addr if you like.
Can you elaborate why it's a show or important? I don't understand. From What I gather you're making it sound like they're going to make up some lies.
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