35i manual surging on WOT

[mikem7709]

I’m getting a strange “surging” feeling on full throttle - more noticeable in 3rd/4th.

Anyone else had similar and if so - a fix? Have changed the plugs and could which were all original, feels slightly better (maybe) but still there.

Manual car 59K miles.

 

[B21]

Stock tune?

Stock injectors?

Any fault codes on your BMW specfic fault code reader ?

 

[mikem7709]

No codes (using Carly)

Index 12 injectors - not sure if the tune is stock or not.

 

[flybobbie]

Just watched this https://www.youtube.com/watch?v=x-fdvWd1LWM&t=606s

 

[B21]

No codes (using Carly)

Index 12 injectors - not sure if the tune is stock or not.

Quite often when they have MHD remaps theses symptoms appear..


mhd lambda  oscillation

 

[mikem7709]

Thanks,

Car is new to me and previous owner has added some mods so quite possible.

It’s going I. For a walnut clean this week, so will see if they can do anything to check the tune. (I don’t have MHD myself to check - have used BM3 previously on F82 M4).

 

[B21]

Thanks,

Car is new to me and previous owner has added some mods so quite possible.

It’s going I. For a walnut clean this week, so will see if they can do anything to check the tune. (I don’t have MHD myself to check - have used BM3 previously on F82 M4).

Flash to stock and see if problem remains

 

[mikem7709]

As an update, incase anyone else has the same issue - cleaning the intake side has made the idle smoother but surging is still there.

Need to get the map looked at next I think.

 

[Busterboo]

WTF is WOT?

 

[enuff_zed]

WTF is WOT?

Wide Open Throttle I believe.

 

[Busterboo]

WTF is WOT?

Wide Open Throttle I believe.

TYVM.

 

[enuff_zed]

WTF is WOT?

Wide Open Throttle I believe.

TYVM.

NP

 

[B21]

Well the inlets were well coked up…so that wouldn’t have helped for sure..but..if it’s still surging then somethings wrong…again a data logger like Protool or MHD would be very useful…ignore my post on lambda oscillation..that issue only appears on very light throttle in steady state

 

[Pondrew]

WTF is WOT?

WTF is 'WTF'? :wink:

 

[mikem7709]

MAGA!

 

[Busterboo]

WTF is WOT?

WTF is 'WTF'? :wink:

The very point of my post. :roll:

 

[Phoenixboy]

WTF is WOT?

WTF is 'WTF'? :wink:

who knows, but it is POETS day today.....

 

[Nictrix]

WTF is WOT?

WTF is 'WTF'? :wink:

who knows, but it is POETS day today.....

Only for some :x

 

[mikem7709]

TFIF!

Flashed with new software today - surging now gone.