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      05-25-2021, 03:37 PM   #1
S2000_Europe
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Hello,

I recently bought an M3 Comp 2017. Mechanically is good but the shop told me that the DME came with a tune. He reseted the DME using bmw software but he still having issues with misfire in cylinder 3,4,5

the car has 40k miles, coils are good, leak test good, new spark plugs ( had one with a step colder)

How can I delete the software and have the original back?

I do not want to drive the car and don't want to buy a new DME.

I am located in Miami

Thanks
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      05-25-2021, 04:21 PM   #2
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It sounds like the shop already reset it to BMW software so it's not tuned anymore. You have a cylinder 3 misfire that needs to be troubleshot.
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      05-25-2021, 04:22 PM   #3
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It's possible the misfire is due to the different plugs and having an oem tune now
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      05-25-2021, 04:48 PM   #4
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sorry if I did not explain myself correctly. Misfire is in cylinders 3,4,6

the shop installed the original plugs and changed the coilers and reset all the software

Could be the injectors?
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      05-25-2021, 04:51 PM   #5
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I don't know. Plenty of asshats are running E85 and doing all kinds of things on leased cars, then return them and you're left trying to figure out what they did
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      05-25-2021, 09:19 PM   #6
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Quote:
Originally Posted by SYT_Shadow View Post
I don't know. Plenty of asshats are running E85 and doing all kinds of things on leased cars, then return them and you're left trying to figure out what they did
Know I understand why bmw lock the DMEs

If I get more info I will post it here. Tomorrow I am going to another shop who is specialized in M3, If this do not work I will try Active Werke and the last resource the Stealership
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      05-26-2021, 10:00 AM   #7
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Quote:
Originally Posted by S2000_Europe View Post
Know I understand why bmw lock the DMEs

If I get more info I will post it here. Tomorrow I am going to another shop who is specialized in M3, If this do not work I will try Active Werke and the last resource the Stealership
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      05-26-2021, 04:59 PM   #8
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What tune was on it originally?
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      05-26-2021, 06:30 PM   #9
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Quote:
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What tune was on it originally?
bootmod3
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      05-26-2021, 06:33 PM   #10
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Quote:
Originally Posted by S2000_Europe View Post
Quote:
Originally Posted by MisterF80M3 View Post
What tune was on it originally?
bootmod3
Just email PTF and ask them for help flashing your car back to stock. They can get their tunes uninstalled.
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      05-26-2021, 06:34 PM   #11
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update

we found that the intercooler is leaking.

next steps, change intercooler, replace coil cables and check if spark plugs where installed correctly


I still do mot understand why the other shop updated the DME software to the 2020 version
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      05-26-2021, 06:43 PM   #12
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Quote:
Originally Posted by TopJimmy View Post
Quote:
Originally Posted by S2000_Europe View Post
Quote:
Originally Posted by MisterF80M3 View Post
What tune was on it originally?
bootmod3
Just email PTF and ask them for help flashing your car back to stock. They can get their tunes uninstalled.
we the shop update the DME the tune was deleted. But the first shop insisted that the tune was still the.

the second shop notice that the intercooler was leaking and is performing to change the coil cables, the first shop said it is not necessary.

History shot my car went to the first shop running well, just a revision and to check all was clear, and leaved with misfire in cylinder 3,4,5
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      05-26-2021, 08:54 PM   #13
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Are you 100% sure you are on stock tune?
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      05-27-2021, 07:35 AM   #14
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Quote:
Originally Posted by MisterF80M3 View Post
Are you 100% sure you are on stock tune?
I am sure, I spoke with the shop who installed and uninstalled the tune. I assume that after reseting the DME with the 2020 ISTA software f the were any tune, it would be deleted
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      05-27-2021, 12:43 PM   #15
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update 2

The second shop was right, installed M performance coil cables and now the M3 runs perfect. The first shop still insist that the DME is damage.

Intercooler was leaking

The car runs a bit lean, the mechanic found that the car had an aftermarket intake and when retrofit it to stock the MAF sensor was not installed correctly so the air pass through it

Word of advise, never update the ISTA to the last version, because sometime has bugs. That is the reason why shop two could not communicate with the DME with its 2019 version, is like Windows, if it works do not fix it!
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      05-27-2021, 06:42 PM   #16
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Quote:
Originally Posted by S2000_Europe View Post
Word of advise, never update the ISTA to the last version, because sometime has bugs. That is the reason why shop two could not communicate with the DME with its 2019 version, is like Windows, if it works do not fix it!
You got it. The latest software update for the DME will also lock you out of Bootmod3. Rat badtids!
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      06-01-2021, 12:31 PM   #17
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more news,

no more misfires but one oxygen sensor, before cat, is reading lean mixture. While his twin is not.

So seems that needs to the replaced.

The mechanic told me that some "kids" likes high popping noises with their tune. That is really bad for the sensor.

Last time I buy an used BMW
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      06-01-2021, 01:29 PM   #18
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Quote:
Originally Posted by S2000_Europe View Post
Last time I buy an tuned BMW
Fixed
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      06-01-2021, 01:43 PM   #19
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Quote:
Originally Posted by CubicMeters View Post
Quote:
Originally Posted by S2000_Europe View Post
Last time I buy an tuned BMW
Fixed
the car was stock and serviced at bmw dealers.

This also proof that carfax is worthless
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      06-01-2021, 05:05 PM   #20
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Sorry guess I misunderstood the original post.

Carfax does what it does. Certainly a "clean" carfax isn't an unequivocal green light on any vehicle. As they say: absence of evidence is not evidence of absence.
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      06-02-2021, 06:09 PM   #21
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The car now runs like a champ!

the problem was the o2 sensor.

The shop did a leak test and a compression test and all was perfect.

Thanks all for your help
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      06-02-2021, 06:34 PM   #22
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Glad it's fixed.

Strange how the problem occurred across both banks (cyls 3,4,6) with just one sensor failure.
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