BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > 2016 118i drivetrain fail!
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      11-12-2022, 03:14 PM   #1
Lewis156
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2016 118i drivetrain fail!

I’ve had a drivetrain error pop up and misfiring like crazy, garage told me spark plugs and coils need changing, changed them and now still the same! Cylinder 3 failure engine code and a few more will attatch below, any help is gratefully appreciated this is my first bmw and first time anything’s gone wrong with the car!Name:  430AB3D8-4AC5-4E9E-B0FC-C1739EEF4F56.jpg
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      11-13-2022, 01:41 AM   #2
IJO
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Check the battery. A weak one can cause all sorts of errors, although not usually misifiring.

I would expect it to be still on the original batterry, so after 7+years, probably due for one anyway and would be my first step.

When I bought my 85k mile 2014 116i 6months ago the tailpipe looked liked a 1990 diesel's, the average mpg was 34 and it pulled too well below 1500rpm. So basically massively too rich, no significant misfiring but misfire fault codes were present.

I changed the O2 and MAF sensors, cleared the codes and let it relearn the new sensors. I also changed the plugs as the Bosch ones had a massive gap.
Very quickly the mpg improved and the average now is 44, runs smoothly and tailpipe is clean.

Last edited by IJO; 11-13-2022 at 01:54 AM..
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      11-13-2022, 08:53 AM   #3
Lewis156
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Checked battery with a certified BMW batter reader / charger, all good health according to the monitor. Going to have to just bite the bullet and get sent in to BMW and have my pants pulled down for repairs as 2 local garages don’t know what’s wrong.
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      11-13-2022, 01:58 PM   #4
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Lightbulb

It's not exactly about battery's health (which is under control by the on board computer in this car), it's about the contact(s). The previous generation of the 1 Series had an infamous issue (recognized by BMW) of battery connection (unreliable over time, rust-prone) to the car's "front end" where everything happened. But no, not misfiring - this should be something else.
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      11-15-2022, 11:32 AM   #5
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check for spark at Cyl 3 .. when there is no Spark check if Signal for spark ist there,, no sig .. check wiring to dme if wiring ok .. mosfet inside dme defect.. new dme needed
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      11-16-2022, 02:05 PM   #6
Lewis156
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Quote:
Originally Posted by DomMuc View Post
check for spark at Cyl 3 .. when there is no Spark check if Signal for spark ist there,, no sig .. check wiring to dme if wiring ok .. mosfet inside dme defect.. new dme needed
called a BMW specialist and he fit me in this afternoon. He made a bet with a colleague that it would be a cylinder 3 misfire with wiring issues. He won that bet.

Sparks and coils re wired all in all £200 including VAT hour job and she runs even better than before!
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      02-11-2023, 01:20 AM   #7
Js116i
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Quote:
Originally Posted by Lewis156 View Post
called a BMW specialist and he fit me in this afternoon. He made a bet with a colleague that it would be a cylinder 3 misfire with wiring issues. He won that bet.

Sparks and coils re wired all in all £200 including VAT hour job and she runs even better than before!
Hi mate, was it just the wiring going directly to the top of the coil packs?
Got similar issues....
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      02-11-2023, 01:28 AM   #8
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When I was changing the plugs and fitting upgraded coil packs to my 116i, i noticed that the wiring to the coils looked fragile and one had broken insulation.

There wasn't much slack on the wiring so getting the connectors off puts a strain on it.

After I fitted the coils, the engine ran on 3 cylinders until i reseated the connectors.

So try disconnecting the connectors and refitting them and carefully inspect the wiring close to them.

I've not had any misfires or rough running since.
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      02-11-2023, 01:41 AM   #9
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Quote:
Originally Posted by IJO View Post
When I was changing the plugs and fitting upgraded coil packs to my 116i, i noticed that the wiring to the coils looked fragile and one had broken insulation.

There wasn't much slack on the wiring so getting the connectors off puts a strain on it.

After I fitted the coils, the engine ran on 3 cylinders until i reseated the connectors.

So try disconnecting the connectors and refitting them and carefully inspect the wiring close to them.

I've not had any misfires or rough running since.
Thanks for the reply.
I tried unplugging and reconnecting each coil pack with the engine running and when each one was unplugged in ran on 3 cylinders but returned to 4 when reconnected, misfire was still there though. Can't really notice it on tickover, worse when throttle applied. Not quite a running on 3 cylinder type of misfire but still making it undrivable
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