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E90/E91/E92/E93 (2006 - 2013)
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  #126  
Old 10-07-2013, 09:37 PM
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Quote:
Originally Posted by WhiteFury View Post
Update.**

Swapped injector 5&6. Still throwing code for cylinder 5!

So it didn't move this time. Last time the code didn't move. Cylinder 1&2 just stopped misfiring.

What's your thoughts now. Vacuum leak?
Yup. I'm tripling down. Wait, can I do that? The cylinders closest to the leak are the ones which misfire first.
There's just this one nagging thing... At idle there is vacuum in the intake, and even on acceleration in neutral -when the engine is not under load- there's a vacuum. But when you accelerate in gear like when passing at a higher speed, your turbos spool up, the bypass shuts off and you should have lots of positive pressure. That would tend to overshadow an intake leak and result in less misfiring, yet you report the misfiring continuing. I haven't figured this out yet, and it really doesn't fit with my intake leak theory.
Still, before you cleaned the valves you had no problem, after you cleaned the vlaves your engine misfired badly. What happened? The problem did not follow the plugs or coils, and the dealer reported injuector shutdown. Gotta be vacuum...or not. Would I ever like to look at short term fuel trim!
Well, get that new manifold and gasket on there, torqued down properly and let's see what happens next.
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  #127  
Old 10-07-2013, 09:41 PM
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Misfiring after Intake Port Cleaning!

Here are two pictures. The first picture is what the valve looked like when I cleaned them originally and what most of the valves still look like now. The second picture is cylinder number 2.

one of the cylinders misfiring as you can see one of the valves has gunk.

Any thoughts?

Actually it bogs at idle, it does nothing during the light throttle, and under heavy load it sputters and misfires.

The only time the car is behaving properly is when I'm feathering the throttle and accelerating lightly.
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  #128  
Old 10-07-2013, 09:42 PM
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Misfiring after Intake Port Cleaning!

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  #129  
Old 10-07-2013, 09:47 PM
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Misfiring after Intake Port Cleaning!

Here is cylinder 6.

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  #130  
Old 10-07-2013, 09:52 PM
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WhiteFury WhiteFury is offline
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Misfiring after Intake Port Cleaning!

Some of the cylinders are wet and some have a powder dryness to them. Does this mean anything?

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  #131  
Old 10-07-2013, 10:03 PM
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Misfiring after Intake Port Cleaning!

I also put carb cleaner in here last time.

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  #132  
Old 10-08-2013, 12:42 AM
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Misfiring after Intake Port Cleaning!

All new head studs on intake manifold. All new nuts and all torqued to spec 15nm.

Cleaned and checked every single line.

Still getting missfires on cylinder #5.

Only at a decent load. When I got WOT. It just bogs and throws a light instantly.

I am spent. I am running out of time on this. So disappointing.
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  #133  
Old 10-08-2013, 04:25 AM
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Misfiring after Intake Port Cleaning!

So up all night and finally a breakthrough. Maybe you guys could make sense of this bizarre yet good news.

I was just about to call it a night when I decided to swap spark plugs from cylinder 5 & 2. I want to see if this would help. I was hesitant and hasn't done so yet because i switched cylinder 1&2 earlier and it did nothing.

After I switched them I kept getting cylinder #2 misfires. I'm like, holy crap!. So I went ahead and tried again and cylinder #2 misfire. And it's bogging and spuddering like usual. Idle is coughing too.

So I remove the spark plug from cylinder #2 and put in one of old plugs from before.

Boost! It still bogs very slightly, and it through a cylinder #2 misfire. However it was definitely more powerful it was night and day difference. The idle is almost 100%. In fact I don't think it coughed at all.

So I went ahead and put back the new spark plug and it missfires cylinder #2 and drove like crap again.

So I removed this plug and put the old if from before and much better! Still bogs a little and I can hear the slight misfires but nothing like before.

I believe that I have a defective spark plug when I bought new, and my old plug is hanging on by a thread.

Cylinder 1&2 stopped missfiring when I switched and cleaned the injectors. So I am going to switch the injectors back today and go to the dealer for a new spark plug and I think that might be it.

I also cleaned my vanos sensors.

Here is a pic of the old plug I am using right now beside the new plug that is running like crap.

Also, before I took the crappy plug out of cylinder #5 there was a pool of fuel in the cylinder. Yet on cylinder #2 there was none.

Crappy new plug on left and old plug on right.

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  #134  
Old 10-08-2013, 04:26 AM
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Misfiring after Intake Port Cleaning!

One more of old plug and new plug. Old on the right, crappy new plug on left.

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Last edited by WhiteFury; 10-08-2013 at 04:28 AM.
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  #135  
Old 10-08-2013, 04:39 AM
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bear-avhistory bear-avhistory is offline
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Quote:
Originally Posted by DSXMachina View Post
Yup. I'm tripling down. Wait, can I do that? The cylinders closest to the leak are the ones which misfire first.
There's just this one nagging thing... At idle there is vacuum in the intake, and even on acceleration in neutral -when the engine is not under load- there's a vacuum. But when you accelerate in gear like when passing at a higher speed, your turbos spool up, the bypass shuts off and you should have lots of positive pressure. That would tend to overshadow an intake leak and result in less misfiring, yet you report the misfiring continuing. I haven't figured this out yet, and it really doesn't fit with my intake leak theory.
Still, before you cleaned the valves you had no problem, after you cleaned the vlaves your engine misfired badly. What happened? The problem did not follow the plugs or coils, and the dealer reported injuector shutdown. Gotta be vacuum...or not. Would I ever like to look at short term fuel trim!
Well, get that new manifold and gasket on there, torqued down properly and let's see what happens next.
Deus Ex Machina? Thinking of my high school Latin. "God from the machine"
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  #136  
Old 10-08-2013, 05:16 AM
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Originally Posted by bear-avhistory View Post
Deus Ex Machina? Thinking of my high school Latin. "God from the machine"


Sounds like the OP has a good lead on a big chunk of the problem. Remember a thread in the past couple of years where someone went through basically the same exercise and also had bad new plugs? In my business bad new parts are the worst headaches we face. Sparkplugs are simple, imagine buying a transmission control module with a bad circuit. Are you going to suspect that the new part you put in is the problem or spend hours and maybe days looking for it elsewhere? Happens. All the net profit from a hundred oil changes spent chasing a bad new part we put in...
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  #137  
Old 10-08-2013, 05:41 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by DSXMachina View Post


Sounds like the OP has a good lead on a big chunk of the problem. Remember a thread in the past couple of years where someone went through basically the same exercise and also had bad new plugs? In my business bad new parts are the worst headaches we face. Sparkplugs are simple, imagine buying a transmission control module with a bad circuit. Are you going to suspect that the new part you put in is the problem or spend hours and maybe days looking for it elsewhere? Happens. All the net profit from a hundred oil changes spent chasing a bad new part we put in...

HA! BMW ran a few checks but didn't scope the ignition. Gougers!

A simple display of voltage over time.

Wait......wait......doesn't the ECU monitor spark quality? Why, sure. That's the misfire code. So, why didn't BMW scope, knowing there is a misfire?

Good question, isn't it.
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  #138  
Old 10-08-2013, 05:54 AM
roadkillrob roadkillrob is offline
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Wow that new plug looks like it is arching out the side of the insulator or something - never seen one look like that on the side - good catch!
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  #139  
Old 10-08-2013, 08:45 AM
surfcity335i surfcity335i is offline
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Wow that new plug looks like it is arching out the side of the insulator
Exactly. Hope this guy's nightmare comes to an end soon.
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  #140  
Old 10-08-2013, 09:34 AM
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thekurgan thekurgan is offline
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Quote:
Originally Posted by CALWATERBOY View Post
HA! BMW ran a few checks but didn't scope the ignition. Gougers!

A simple display of voltage over time.

Wait......wait......doesn't the ECU monitor spark quality? Why, sure. That's the misfire code. So, why didn't BMW scope, knowing there is a misfire?

Good question, isn't it.
It does in the S65, I'm not sure about the N55.
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  #141  
Old 10-08-2013, 09:34 AM
jburke4689 jburke4689 is offline
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Originally Posted by WhiteFury View Post
I also put carb cleaner in here last time.

Attachment 401000

Attachment 401001
isn't that the accessory drive for the HPFP and the vacuum pump? Definitely should be putting carb cleaner in there.
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  #142  
Old 10-08-2013, 09:53 AM
hondo402000 hondo402000 is offline
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well it is possible that a new spark plug is bad,

if they didnt cost like 20 bucks a piece I would replace them all

In High School like long time ago, Auto shop had a spark plug cleaning machine that you could hook a lead to the plug and you could watch it fire. you could take the plug and using your lawn mower hook the lead to that plug and ground it and pull the starter rope and see how it sparks
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  #143  
Old 10-08-2013, 10:01 AM
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Zooks527 Zooks527 is offline
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isn't that the accessory drive for the HPFP and the vacuum pump? Definitely should be putting carb cleaner in there.
Did you mean "shouldn't" ?
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  #144  
Old 10-08-2013, 11:39 AM
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BB_cuda BB_cuda is offline
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I bet whitefury is a pro at pulling and installing the intake now. Too bad you got yanked around on a simple part swap. Way to stick to your facts on your diagnosis. I wouldn't go to that dealer anymore. $1500 in coils and injectors.......... and it still wouldn't have fixed it.

On a side note, when i hear the term white fury, i think of my dad's old 63' sport fury with 383. He drove the crap out of that thing. White coupe with red interior. Yes, this is where the beginnings of my cuda moniker came from.

Last edited by BB_cuda; 10-08-2013 at 01:06 PM.
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  #145  
Old 10-08-2013, 11:55 AM
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Originally Posted by hondo402000 View Post
well it is possible that a new spark plug is bad,

if they didnt cost like 20 bucks a piece I would replace them all

In High School like long time ago, Auto shop had a spark plug cleaning machine that you could hook a lead to the plug and you could watch it fire. you could take the plug and using your lawn mower hook the lead to that plug and ground it and pull the starter rope and see how it sparks
You can get them in an auto store for about or less 1/2 that price. BMS also sells mail order them for $11 each.
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  #146  
Old 10-08-2013, 11:56 AM
SoCalRep SoCalRep is offline
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I suspect the coils and injectors would have fixed it (to the consumer) because the dealer would have replaced the spark plugs and never told him about it when they realized the car was still malfunctioning.
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  #147  
Old 10-08-2013, 12:24 PM
jburke4689 jburke4689 is offline
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Did you mean "shouldn't" ?
Sorry, I did mean shouldn't.
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  #148  
Old 10-08-2013, 12:48 PM
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thekurgan thekurgan is offline
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We should start a pool with the possible causes:
  1. vacuum/air leak
  2. plugs
  3. injectors
  4. fuel pump
  5. O2 sensors
  6. solenoid
  7. MAF sensor
...

It will probably be something lame like a corroded sensor plug

Winner gets Bimmerfest stickers???
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  #149  
Old 10-08-2013, 01:59 PM
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Misfiring after Intake Port Cleaning!

I am on my way to the dealer right now to get the new spark plug. i will have results soon. As of right now the car drives 80% which is a lot better than Any day in the last week.


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  #150  
Old 10-08-2013, 03:29 PM
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Misfiring after Intake Port Cleaning!

Update***

So I put the new plug-in from the dealer and I still get a random bog here and there and it still sputters very slightly under load but the power is there and I can feel it.

I still have the injector from cylinder one in cylinder three, and I have the injector from cylinder five cylinder six.

Could this be the reason why it's still sputtering and bogging very slightly?

Because before with a bad spark plug the car had no power at all it was really bad, Now the Cardinals powerful but just bogs randomly but it's very minimal.


Edit: Even with the bogging, and the random coughing at Idle There is no check engine light and I cannot replicate one. I drive it to try to get it to sputter and create a check engine light but it's nowhere near as bad as it was this week and there's no check engine light.

I guess the injector swap back to normal will probably solve my problem or what's left of it hopefully.
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Last edited by WhiteFury; 10-08-2013 at 03:39 PM.
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