m235i: rough costs of head gasket, cylinder head, and engine replacement? |
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08-12-2016, 03:51 PM | #45 | |
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08-12-2016, 03:54 PM | #46 |
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BTW, BMW does not need to look at the ECU case to find tampering. They don't need to find some tamper proof sticker or seal or physical access history to the ECU. They simply plug into the OBD2 port and they will get a message that says "DME protection against tampering: program or data manipulation detected."
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08-12-2016, 04:19 PM | #47 |
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Big surprise people, the ECU performs a checksum during boot-up as do most critical systems utilizing a microprocessor. Check out this explanation for what a checksum error is. If things don't add up (literally) it registers an error code.
Oh, and if you want to be totally paranoid, in our systems we keep a running tab of the checksums. So, even setting the code back to the original and clearing the error will not eliminate the evidence. Last edited by mdputnam; 08-12-2016 at 04:43 PM.. Reason: added a little paranoia |
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08-12-2016, 04:45 PM | #48 | |
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08-12-2016, 05:07 PM | #49 |
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I have no idea how BMWs work.
Systems I am familiar with have a rolling list of lets say the last 100 checksums, when the system boots it preforms another checksum and adds it to the list, then the system checks the whole list. If there is a single discrepancy on the list the system will register an error code. |
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08-12-2016, 05:39 PM | #50 |
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Im sorry to hear about your issue.. you would def think this to be material defect. But... the moral of the story is, flash your ECU/DME to stock before taking to BMW for any kind of issue where they may scan your system. This would have been a better discussion had it been reflashed to stock. Its irrelevant in a sense due to the fact that the proper route was not taken to hide the flash. We dont truly know what would have been found by the tech had it been set to stock parameters. All of this is speculation and assumptions. I would like to see what Enzo has to say in regards to this.
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08-12-2016, 06:21 PM | #51 | |
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08-12-2016, 09:00 PM | #52 | ||
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08-15-2016, 09:53 AM | #53 | |
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I've yet to hear anything official from any of the tuners regarding this. Only customers speaking on their behalf. Piggy back (jb4) should not effect checksum or the flash counter.
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08-15-2016, 10:56 AM | #54 | ||
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08-16-2016, 10:06 AM | #55 | |
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No tuner has officially answered these questions about flash counters logs and checksum logs. All they will say, "You can flash back to stock", without any further details.
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08-19-2016, 08:14 AM | #56 |
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I would have thought, if you're paying for this repair, a good low mileage engine from a breakers yard would be the best solution?
There must be loads of M235is crashed with less than 20k miles on the clock? Though, you mention it's a lease, so I guess an engine number change would cause you another problem..! Richard
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08-29-2016, 07:05 PM | #57 |
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08-30-2016, 09:39 AM | #58 | |
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08-30-2016, 09:47 AM | #59 | ||
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So anyone thinking a dealer won't know is sorely mistaken. All you have to do is unscrew the t15 screws and the covers falls right open. Tuners promoting the "undetectable" by dealer need to truthfully inform the community and clients. Yes it's undetectable to the eye as the dme is under the manifold, yes it's undetectable through OBD. But all they have to do is take off your manifold and be able to tell. Especially when boneheads slap a sticker on the inside cover calling it tamper proof
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08-30-2016, 09:53 AM | #60 | ||
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Flash tuning is great and I support it but there are a lot of risks. Prepare to suffer the consequences. Not to make the OP feel like shit and I hope he gets it resolved and covered but WTF were you thinking flashing a god damn lease car? Slap on a jb4 like the rest...
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08-30-2016, 09:55 AM | #61 | |
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We know for a fact that it's not detectable simply by OBD. But you are partially correct there are cases of certain tuners that have triggered the dme tamper code. RIP to those folks warranties...
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08-30-2016, 11:02 AM | #62 | ||||
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I've been asking PTF about their BM3 flash that's in beta. They seem to give very straight forward answers to the "is it detectable" question. Unlike some other tuners.
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08-30-2016, 11:20 AM | #63 | ||
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08-30-2016, 11:26 AM | #64 | |||
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08-31-2016, 10:35 AM | #65 | |||
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08-31-2016, 01:03 PM | #66 |
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They said you can replace the seal in my previous post and it's very easy to do. Pretty sure it's a silicon seal. I've seen the OEM silicone for sale on some websites, but I can't seem to find it now.
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