Unfortunately we do not accept new members for free, Now Registration cost 30€, if you are interesting Send Email to [email protected]

Misfire cylinder 5, about to pull open engine as last resort!
07-10-2017, 19:28 PM,
Post: #21
RE: Misfire cylinder 5, about to pull open engine as last resort!
Its quite common for M54 DME that some of transistor packs which powers coils are burning out.
Result - the same - misfire on some cylinders.

Also it's quite common for M54/M52 to have head gasket burned out between Cyl 4/5/6, mostly 5/6.
Everything work okay, even compression test seems to give good results, but there is funny "clicking" noise barely noticeable on partial throttle. Issue is, on WOT, gasket is leaking between Cylinders giving misfire too.

If that would be mine car, Coils + Plugs first, if no, DME transistor pack check, then head gasket work.
Quote this message in a reply
[+] 2 users say Thank You to bohozoku for this post
08-10-2017, 05:15 AM, (This post was last modified: 08-10-2017, 05:15 AM by raduandrei82.)
Post: #22
RE: Misfire cylinder 5, about to pull open engine as last resort!
(07-10-2017, 19:28 PM)bohozoku Wrote:  Also it's quite common for M54/M52 to have head gasket burned out between Cyl 4/5/6, mostly 5/6.
Everything work okay, even compression test seems to give good results, but there is funny "clicking" noise barely noticeable on partial throttle. Issue is, on WOT, gasket is leaking between Cylinders giving misfire too.

It is not M52/M54, the OP said engine is N52
Quote this message in a reply
08-10-2017, 08:27 AM,
Post: #23
RE: Misfire cylinder 5, about to pull open engine as last resort!
Yup i know. Head gasket prone to fail on N52 too smile
Quote this message in a reply
08-10-2017, 09:22 AM, (This post was last modified: 08-10-2017, 09:23 AM by uragan1987.)
Post: #24
RE: Misfire cylinder 5, about to pull open engine as last resort!
(06-10-2017, 09:08 AM)semihmutcali Wrote:  I know the problem. That is ecu problem. I sent pm how can you repair

will be nice to get more informations here,
got now same issue, after put new spark plugs
Engine N55 35ix F25 2012
Quote this message in a reply
09-10-2017, 06:25 AM, (This post was last modified: 09-10-2017, 06:28 AM by willisodhiambo.)
Post: #25
RE: Misfire cylinder 5, about to pull open engine as last resort!
(07-10-2017, 19:28 PM)bohozoku Wrote:  Its quite common for M54 DME that some of transistor packs which powers coils are burning out.
Result - the same - misfire on some cylinders.

Also it's quite common for M54/M52 to have head gasket burned out between Cyl 4/5/6, mostly 5/6.
Everything work okay, even compression test seems to give good results, but there is funny "clicking" noise barely noticeable on partial throttle. Issue is, on WOT, gasket is leaking between Cylinders giving misfire too.

If that would be mine car, Coils + Plugs first, if no, DME transistor pack check, then head gasket work.

Yes. This is more or less the path we have chosen. The misfire is now stuck in cylinder 4 having moved over from cylinder 5. Total insanity. We are looking into opening UP DME to check out these "transistor packs" failing which we replace the DME. If that fails then painfully cylinder head out.

(08-10-2017, 09:22 AM)uragan1987 Wrote:  
(06-10-2017, 09:08 AM)semihmutcali Wrote:  I know the problem. That is ecu problem. I sent pm how can you repair

will be nice to get more informations here,
got now same issue, after put new spark plugs
Engine N55 35ix F25 2012

Oh No! When this starts it can be hell. I have an N55 F10 that used to throw engine knocking faults all over and "valvetronic no adjustment possible". Updated the integration level and it stopped, luckily.

Ill follow your path to resolution keenly too. Will update once we change DME on the N52
Quote this message in a reply
09-10-2017, 11:25 AM,
Post: #26
RE: Misfire cylinder 5, about to pull open engine as last resort!
Ok, how did you update it? Istap? Esys? Did you update only DME?

hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi 
VAG iDEX Activation (every Version)
handshake handshake handshake handshake handshake handshake handshake handshake handshake handshake handshake handshake handshake handshake handshake handshake handshake
Quote this message in a reply
09-10-2017, 11:54 AM,
Post: #27
RE: Misfire cylinder 5, about to pull open engine as last resort!
Software will not fix a 1 cylinder misfire.


If you're unsure of engine having a physical issue, compression test plus leak down test will tell you the story.
Quote this message in a reply
10-10-2017, 03:12 AM,
Post: #28
RE: Misfire cylinder 5, about to pull open engine as last resort!
Check Fuel injector number if is 9 or 10
fuel injector must be exchanged to the 11 or 12 new one
and coding
Quote this message in a reply
10-10-2017, 04:18 AM,
Post: #29
RE: Misfire cylinder 5, about to pull open engine as last resort!
This is mechanical problem. how much km have car?
Quote this message in a reply
10-10-2017, 12:07 PM,
Post: #30
RE: Misfire cylinder 5, about to pull open engine as last resort!
(10-10-2017, 04:18 AM)bobdinro Wrote:  This is mechanical problem. how much km have car?

About 123000KM. First it was a misfire predominantly around cylinder 5 for weeks. Now it has moved to cylinder 4 and seems to have stuck there.

Only two options now remain, DME and engine out.
Quote this message in a reply


Possibly Related Threads…
Thread Author Replies Views Last Post
XZBMW G30 Flexray ports will not open! armenh7 6 291 25-03-2024, 18:35 PM
Last Post: Siki78
  Engine swap E60 535d --> E61 530d coding advice requested Stratofortress 9 303 23-03-2024, 14:59 PM
Last Post: Simoniak
XZBMW How-to check engine for superknock (superdetonation LSPI) with eXtratool and ELM327 VroomVroom 0 111 02-03-2024, 17:56 PM
Last Post: VroomVroom
XZBMW Solved ✔ F10 535i engine power loss 15mph, DME issue? Nixer 17 803 28-01-2024, 16:26 PM
Last Post: maksymw
XZBMW F30 Open Bonnet Code Out donjuan020 10 907 24-01-2024, 16:29 PM
Last Post: Powerlab
XSMini Mini R56 engine and ECU swap daMassa 8 398 10-01-2024, 13:21 PM
Last Post: Mwahab
XZBMW When the engine is started, the diagnosis is lost BMW E39 530d OBD II spider231 7 264 03-01-2024, 07:03 AM
Last Post: jenny123
  BMW e38 - No Check engine light. It3_Magic 3 188 18-12-2023, 12:58 PM
Last Post: Vadim AA
XZBMW Request for PUMA docs, for engine replacement B58 E36 4 339 11-12-2023, 16:58 PM
Last Post: Node
  Ista can not open existing operation. laquangksxd 3 376 04-11-2023, 20:03 PM
Last Post: blax123

Forum Jump:


Users browsing this thread:
1 Guest(s)

Return to TopReturn to Content