[5soko]

Around 25K miles i bought new oem plugs from tischer, installed and got a misfire right away.. sometimes it would misfire on coldstart, sometimes it wouldnt, but almost everytime it misfired. If it didnt the car ran rough during the coldstart and the exhaust popped. No CEL/SES etc. just when i read the codes myself the misfire codes were there.

So recently ive been keeping a eye on my coldstarts and misfire codes. Tried no E85, map 0, map 2 etc. to see if it would go away. IT DIDNT.

My coldtstart were horrible with misfires and exhaust popping.
Otherwise the car ran good and logs looked good. No codes etc besides coldstart.

So yesterday morning i decided to go back to the old plugs the car came with (i had them labeled for each cylinder)
threw them in and cold started like a dream, no misfires, no popping.

So i took her out for a run and i noticed got a lil more power and lil more boost aswell. wierd. But the car felt great.

2 more coldstarts to verify the old plugs are working better then the old and i can gladly say my old 25K miles plugs do not misfire on coldstart!!!
No popping of the exhaust, no shaking and etc. new plugs have about a 500-1000 miles on them maybe. Misfires happened oon 1, 3,4 and sometimes 6.

Im guessing with new plugs, looks like def have to reset adaptions of the ECU or something. I tried disconnecting the battery aswell nothing helped.

Gonna run my plugs the car came with until they start dying on me for now. Until i feel like messing with resetting adaptions with the new plugs.
Yes i Tq'd them to spec down and uninstalled and installed them twice to verify correct install. They arent damaged and all the new plugs looked good after running them. Has to be a ECU reset of some sort only thing i can think of.

[335okc]

rough cold start happened to me right after i changed my plugs too, but i never bothered putting them back in.
i did reset all the adaptations possible with procede. rough start still there, but i never got misfire.

[scottp999]

You are on the right track...read this: http://www.e90post.com/forums/showthread.php?t=386376

My comments are on page 2. -enjoy

[Jeff@TopGearSolutions]

Yes! Definitely Reset Adaptations. As some of you may or may not know, as your spark plugs get older your gap increases as the spark wears away some metal. You could likely re-gap old plugs back to stock gap temporarily. However, you would likely still want to reset adaptions. Anytime any of my cars felt a little weird or did a silly glitch the first thing I do is reset firmware and reset adaptations before I start changing or doing anything else.

I'm trying to recall stock gap for people reading but I can't find it at the moment.

[Br0]

^ 0.7mm gap

[5soko]

Originally Posted by 335okc

rough cold start happened to me right after i changed my plugs too, but i never bothered putting them back in.
i did reset all the adaptations possible with procede. rough start still there, but i never got misfire.

interesting.. I wonder if the BT cable can reset more adaption then the procede.

Originally Posted by scottp999

You are on the right track...read this: http://www.e90post.com/forums/showthread.php?t=386376

My comments are on page 2. -enjoy

Thanks.. Def helpful.. But for spark plugs, should we do what Mr.5 highlighted, or all of them.. How did he come to the conclusion of those parameters needed resetting?

Originally Posted by Jeff@topgearsolutions

Yes! Definitely Reset Adaptations. As some of you may or may not know, as your spark plugs get older your gap increases as the spark wears away some metal. You could likely re-gap old plugs back to stock gap temporarily. However, you would likely still want to reset adaptions. Anytime any of my cars felt a little weird or did a silly glitch the first thing I do is reset firmware and reset adaptations before I start changing or doing anything else.

I'm trying to recall stock gap for people reading but I can't find it at the moment.

Thanks. Make sense.
Next time i throw my new plugs in, im going to take my BT cable and reset everything.. See what happens..

[Eleventeen]

When I replaced my plugs a couple of years ago, I kept getting misfire codes on cylinder 6, which got progrssively worse over the next couple of weeks. I changed out the coil pack to no avail. Then I put an old plug back in that cylinder and the issue went away. It turns out the brand new plug in that cylinder was bad. Once I confirmed, I ordered another new plug and installed with no issues. First time I have ever seen a new plug fail right away.

[BoostedE90]

Originally Posted by Br0

^ 0.7mm gap

+1...
0.027" (0.7mm) Gap

[335okc]

Originally Posted by 5soko

interesting.. I wonder if the BT cable can reset more adaption then the procede.

i guess i gotta do it the hard way (INPA)

[bula]

Originally Posted by 335okc

i guess i gotta do it the hard way (INPA)

Have you tried adapting with INPA? Can you post how to? TY

[335okc]

Originally Posted by bula

Have you tried adapting with INPA? Can you post how to? TY

i haven't, the car got better after a few months. i assumed it learns slowly if you don't reset adaptations.