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      04-27-2011, 02:29 PM   #1
whn
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Exclamation Problems after changing new spark plugs! Help!

Okey this is turning very strange.. atleast for me.
Quick brief what happened.


Got the new (OEM) spark plugs changed by my mechanic after changing the plugs they were getting misfire at cylinder no 3.
Coils, all the wires, plugs and everything is checked but misfire wont go away. They tried with old plugs and that didn't change a thing.
Misfire is always at cylinder no 3 even if the coil is changed from a different cylinder.

They also updated the software but it didn't help.

Now everyone in here is like "WTF? o.O"



What you say?
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Last edited by whn; 04-27-2011 at 02:40 PM.
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      04-27-2011, 03:26 PM   #2
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Injector?
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      04-27-2011, 04:00 PM   #3
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Injector?
+1
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      04-27-2011, 04:03 PM   #4
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injector!

what RPm is misfire?
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      04-27-2011, 04:04 PM   #5
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Quote:
Originally Posted by jdbretz View Post
Quote:
Originally Posted by secretsquirrel View Post
Injector?
1
2
Was the spark plug fouled on cylinder #3?
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      04-27-2011, 04:06 PM   #6
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definitely injector. go to the dealer and get it replaced under warranty
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      04-27-2011, 04:15 PM   #7
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is there a need to properly gap the sparx or do they come pre-gapped for our cars?
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      04-27-2011, 04:17 PM   #8
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Pre-gapped
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      04-27-2011, 04:28 PM   #9
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thanks Rob
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      04-27-2011, 04:33 PM   #10
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I would still bet on the wires to the coil #3.

By the way, with which sparkplug did the installer begin changing the sparkplugs ? Maybe he begun with the #3 which is right in the center, and didn't know how to remove the coil socket and damaged the socket.
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      04-27-2011, 04:36 PM   #11
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Seems like an injector to me. If you claim all the wires are good then that's basically the only thing it could be. You need 3 things to make a fire, spark, fuel, and O2. You know you are getting air and you eliminated the spark aspect by going back to the old plug, so the only thing left is fuel. That's my .02
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      04-27-2011, 05:02 PM   #12
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Mine ran rough after new plugs. I think the car has a hard time going from the large gap on the old plugs to the smaller gap on the new plugs. If you compared you would see that the electrode gets shorter, making a wider gap.

I used Mr.5's post on resetting certain adaptions with the BT tool and the car ran like new after that.

Read through the first couple of pages here: http://www.e90post.com/forums/showthread.php?t=386376
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      04-27-2011, 05:39 PM   #13
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Quote:
Originally Posted by tscdennab View Post
I would still bet on the wires to the coil #3.

By the way, with which sparkplug did the installer begin changing the sparkplugs ? Maybe he begun with the #3 which is right in the center, and didn't know how to remove the coil socket and damaged the socket.
im thinking he cracked the coil socket housing too
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      04-27-2011, 11:03 PM   #14
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Quote:
Originally Posted by Jeff@topgearsolutions View Post
injector!

what RPM is misfire?
It's starts instantly as I start the car. And won't go away in any RPM.
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      11-07-2011, 06:49 PM   #15
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Sorry to bring this thread back from dead...OP did you figure out a solution? Let us know.
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      11-08-2011, 11:24 AM   #16
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Quote:
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It's starts instantly as I start the car. And won't go away in any RPM.
I wonder if the OP checked the gaps on the plugs before installing them? I changed my plugs this weekend and two of them got damaged during shipping. One of the prongs (on two of the plugs) was bent all the way to the electrode. I checked the gap on all the spark plugs and almost all of them needed some minor adjustment.

This post shows pretty much how my plugs looked...

http://www.e90post.com/forums/showthread.php?t=604559

Last edited by BoostedE90; 11-08-2011 at 11:53 AM.
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      11-11-2011, 05:32 PM   #17
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Quote:
Originally Posted by bavaddict View Post
Sorry to bring this thread back from dead...OP did you figure out a solution? Let us know.
yup, there was a manufacturing defect on all of the 6 plugs
What a great luck eh?
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      11-11-2011, 06:25 PM   #18
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Thanks for letting us know. We're the plugs Bosch oem's or genuine BMW ?

I bought mine from ECS tuning.....did u pick yours up from there?

Trying to narrow it down before I plunge an purchase another set.

Thanks
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      11-11-2011, 06:38 PM   #19
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Quote:
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yup, there was a manufacturing defect on all of the 6 plugs
What a great luck eh?
WTF? That had to make the process pretty interesting to debug.
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      11-13-2011, 01:42 PM   #20
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Quote:
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Thanks for letting us know. We're the plugs Bosch oem's or genuine BMW ?

I bought mine from ECS tuning.....did u pick yours up from there?

Trying to narrow it down before I plunge an purchase another set.

Thanks
those were Bosch OEM's, they changed 6 new genuine BMW plugs and vola runs like a champ!
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