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35iS Ignition Problem

mpc007
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35iS Ignition Problem

Post by mpc007 » Wed May 17, 2023 9:10 pm

Was able to reproduce the issue steadily now when going low speed (70 kph) in Manual 7th gear and then going full ham on the throttle (on a good straight road). Will upload a short video soon and they you can decide whether you think its ignition/fuel related or a traction problem. Its important to mention the issue ONLY arises when revs are low and then you give it a punch (throttle wise), if you're just accelerating quickly going through the gears (shifting at 4-6k rpms) sequentially in a manual way there is no problem at all.

Unfortunately that's not all, my former issue was away for 3 days but after a good quick evening drive today the 'old' issue with CEL and running on less cylinders came also back. Guess it wasn't the plugs / coils, or at least not solely them :?

Will shoot the shop that did the replacement (under warranty) earlier a message and see what they think. Its giving same 2DED > 'Power management, close d-circuit current violation' code but misfire codes are no longer solely the 29D0 > 'Combustion misfires, cylinder 4' but also the similar codes for cylinders 2 and 6. Guess I might start thinking about an injector or HPFP issue after all?
Current
2010 E89 Z4 35iS Melbourne Red (weekend)

Former
2004 E85 Z4 3.0i SMG Toledoblau (weekend)
2001 E46 Coupe 325Ci Orientalblau (project car)
2017 Mazda MX-5 ND 1.5 GT-M Soul Red Crystal (weekend)
2003 Peugeot 206 GTI
1998 Peugeot 106 Sport

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B21
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Location: In my Banana Yellow Space Shuttle...somewhere over Southern Caledonia

35iS Ignition Problem

Post by B21 » Wed May 17, 2023 9:13 pm

What index numbers are your injectors?

What fuel is it on?
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

mpc007
Newbie
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Posts: 32
Joined: Sun May 23, 2021 11:43 pm

35iS Ignition Problem

Post by mpc007 » Thu May 18, 2023 11:22 am

How can i check the index numbers?

Currently on regular E10 (RON 95 w 10 pct ethanol)
Current
2010 E89 Z4 35iS Melbourne Red (weekend)

Former
2004 E85 Z4 3.0i SMG Toledoblau (weekend)
2001 E46 Coupe 325Ci Orientalblau (project car)
2017 Mazda MX-5 ND 1.5 GT-M Soul Red Crystal (weekend)
2003 Peugeot 206 GTI
1998 Peugeot 106 Sport

Online
User avatar
B21
Lifer
Lifer
Posts: 5326
Joined: Tue Oct 05, 2021 7:15 pm
Location: In my Banana Yellow Space Shuttle...somewhere over Southern Caledonia

35iS Ignition Problem

Post by B21 » Thu May 18, 2023 11:46 am

The DDE code is a seperate issue with one or more systems on the car not shutting down properly when shut off..


https://f80.bimmerpost.com/forums/attac ... 1453518695


If you take the cam cover of you can see the index number printed on top of the injector..

HPFP could be an issue..they are known to go south..

Can you do logging?

Then you can see things like LPFP HPFP pressures!
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

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