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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Rough idle/missing after spark plug change



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      12-04-2009, 03:27 PM   #23
raceyBMW
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Wondering if you can just unhook battery to reset adaptations? That how it works in most cars.
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      12-05-2009, 04:28 AM   #24
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Quote:
Originally Posted by Perfectus View Post
Did they have to reset it? Or can we do it ourselves? I'm in the same boat and I think mine was not reset. Thanks!
I donīt think that we can reset by ourselves, I reseted it with the bmw machine, we had to enter in ignition menu or similar. I could read "reset of stratification adaptation"
The dealer did not know nothing about this, but our engines can work with stratified mix (no smooth), the mix is distributed by layer (higher volume of gasoline near of spark plug)

I too reseted the "trottle adaptation", we can do it by ourselves without machine, there is a post about this:
http://www.e90post.com/forums/showthread.php?p=6309845

Note: the adaptation learns about our driving style, when you reset the adaptation, normally we will notice a improvement.
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      12-07-2009, 01:25 PM   #25
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^^

Going to the dealer this week to have this done. It's been about 1400 miles since they replaced my sparks and the idling has gotten a little better but not 100%.
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      12-07-2009, 06:36 PM   #26
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Quote:
Originally Posted by Perfectus View Post
^^

Going to the dealer this week to have this done. It's been about 1400 miles since they replaced my sparks and the idling has gotten a little better but not 100%.
Good luck. I hope you have better luck than i did with my dealer regarding the idle after they changed my plugs. They checked my car for fault codes last week to see if it would tell why i get a rough idle at certain times hot or cold, no codes no solution, they did nothing.

If i were to mention the question to the service manager of the adaptation reset to make an appointment he likely would not know what the hell i was talking about, he is just a guy with a shirt and tie, not a tech, it amazes me how much he does not know about these cars, i am just an enthusiast and i feel like i know more.

let us know if they fix your idle problem.
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      12-08-2009, 01:14 PM   #27
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I went yesterday to get a quart of oil (another issue that BMW will not admit something is wrong) and mentioned the reset and the SA looked at me like...uhhh they did reset the computer. She showed me where the computer was reset to say the spark plugs were changed. But I told her about the ignition menu, stratification adaptation and she said I would need an appt. Hopefully I can get them to hook it up while I'm present.
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      12-14-2009, 06:05 PM   #28
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Does anyone know if we can reset this value with a BT cable?
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      12-18-2009, 07:33 AM   #29
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Quote:
Originally Posted by Perfectus View Post
^^

Going to the dealer this week to have this done. It's been about 1400 miles since they replaced my sparks and the idling has gotten a little better but not 100%.
When you drive more miles, the idling will be perfect.
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      07-01-2011, 02:41 AM   #30
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Link to current thread: http://www.e90post.com/forums/showth...64#post9934064

Resolved my rough idle issue:


There is a Porsche service bulletin to not use Anti-Sieze "anti-seize compound seems to interfere with the proper grounding of the plugs."

We can use a tiny bit of DiElectric grease on the ceramic top of the plug or the rubber boot of the ignition coil to make removing the ignition coil easier in the future.

Check the gap of your old plugs, all six of the factory platinum Bosch plugs had a .043 gap, the box and website both say .040, I adjusted the new ones to match with a wire gap tool, car is running exactly the same as with the old plugs.

When I gap the plugs to .040 it starts rough after sitting dormant overnight (hot soak) and idled rough. Yes, I cleared all adaptations using a BT tool, still idled and started rough after a hot soak.

We can also use an 8" extension for the rear two plugs instead of removing the bar that runs over top of them.

Last edited by Glim; 07-17-2011 at 02:24 AM.
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      07-12-2014, 04:21 PM   #31
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Quote:
Originally Posted by Perfectus View Post
I'm in the same predicament... I had my plugs replaced by the dealer under the warranty. It idled horribly and I gave it back to them. They found codes for 2 "faulty" spark plugs. They replaced them and the car is still idling rough but not has rough as it did after the initial replacement. My car is at 46k+ and never idled like this before. Even after the car has warmed up and been driven for an hour+ the idle is still rough. I gave it to them for a week and told them to fix it. They said its normal and couldn't find anything wrong, no codes, etc. They can't do anything without codes and I told them about the injectors, coil packs, etc...no action without any codes.

Should I contact BMWNA?
I'm having this exact issue, although I havent taken it to the stealership since I am no longer under warranty.

Car idles rough at about 600rpms, other than that it is still smooth and perfect. Checked the coils and the connectors and everything seems fine. No CELs or anything.

Has anyone figured this out?
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      07-13-2014, 10:09 AM   #32
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Quote:
Originally Posted by Terrafina View Post
...I just the same OEM plugs but I did not gap them...
Go back and gap them. It doesn't matter that they are pre-gapped. I have yet to find plugs (even pre-gapped ones) that didn't need gapping.

Now gappy gap gap and go back to gap . Felt silly for a moment after saying gap a lot.
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      07-13-2014, 12:08 PM   #33
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Will try to go back and check the gap on the plugs later. The OEM plugs should already be correctly gapped though correct?
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      07-13-2014, 12:25 PM   #34
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If im correct, the ECU should also adjust the gap over time correct? So maybe after driving it for X miles it will adjust?
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      08-27-2014, 09:26 AM   #35
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Has a better solution to this be added anywhere.
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      Yesterday, 04:25 PM   #36
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I have same issue. I don't have any sort of cable or machine to hook it up to so I am wondering how I get this fixed by the dealership since they also changed my plugs
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