[Saif2018]

Originally Posted by iqraceworks

I have not tried another tune. When it was doing that surging on the highway....it was at light throttle at 70mph....and fuel pressure was around 70psi. I wasn't putting a load on the car.

Ok, then the surging doesn't seem to be LPFP related.

I'm assuming you've reset throttle adaptations already and that had no effect?

[BMDUBZ]

I had the same problem. I have a jb4 installed. I changed a few settings on there and it helped. mostly map 12.

[iqraceworks]

Originally Posted by Saif2018

Ok, then the surging doesn't seem to be LPFP related.

I'm assuming you've reset throttle adaptations already and that had no effect?

Nope...haven't tried that yet.

[roadkillrob]

Originally Posted by iqraceworks

I have not tried another tune. When it was doing that surging on the highway....it was at light throttle at 70mph....and fuel pressure was around 70psi. I wasn't putting a load on the car.

I have had it occur like this, highway top gear and light application of throttle and it would oscillate/surge - was on a GIAC Stage 2 tune, went away when I switched tunes - I have heard some people get it on MHD 9.0 Beta - I saw it very lightly on MDH original version 8 beta.

What are you actually running for tuning - looks like MHD 2+ in your profile, which version?

[iqraceworks]

Originally Posted by roadkillrob

I have had it occur like this, highway top gear and light application of throttle and it would oscillate/surge - was on a GIAC Stage 2 tune, went away when I switched tunes - I have heard some people get it on MHD 9.0 Beta - I saw it very lightly on MDH original version 8 beta.

What are you actually running for tuning - looks like MHD 2+ in your profile, which version?

I'm running the MHD Stage 2+ 93 tune......been running it for months.

[Saif2018]

Originally Posted by iqraceworks

Nope...haven't tried that yet.

Try it, it improved throttle response when I did. Might help with oscillation at light throttle.

[iqraceworks]

Originally Posted by Saif2018

Try it, it improved throttle response when I did. Might help with oscillation at light throttle.

Once you reset those throttle adaptations....is there any relearn procedure that needs to be done? Or just drive it?

Thanks!

[Saif2018]

Originally Posted by iqraceworks

Once you reset those throttle adaptations....is there any relearn procedure that needs to be done? Or just drive it?

Thanks!

You reset Throttle adaptations, switch off and wait at least 30 secs before restart. That's what I did. Then you just drive, the DME learns adaptations as you drive if I recall correctly. No need for waiting any miles before going WOT, just drive as you normally would.

[rush jamaica]

I’m having this problem also anyone got any solid info on the fix

[raptorman5174]

Ok guys i am still having this issue and it seems to be troubling a lot of enthusiast out there. On one of the Facebook groups there was a guy that said he changed out the fuel pump control module and it solved his problem

https://www.fcpeuro.com/products/bmw...it-16147229173

I know this has to be coded to the car when you replace it. What are the community thoughts about this?

[rush jamaica]

Kinda doubt it but willing to try anything at this point

[iqraceworks]

The light surging type issue I can seems to have gone away after my new LPFP. I'm not convinced that was the problem.....but until it does it again, that's all I have to go on.

[iqraceworks]

Originally Posted by raptorman5174

Ok guys i am still having this issue and it seems to be troubling a lot of enthusiast out there. On one of the Facebook groups there was a guy that said he changed out the fuel pump control module and it solved his problem

https://www.fcpeuro.com/products/bmw...it-16147229173

I know this has to be coded to the car when you replace it. What are the community thoughts about this?

If fuel was the issue....you should be able to run a log and see where your fuel pressures are at. Have you done that?

[_N54]

Originally Posted by raptorman5174

Ok guys i am still having this issue and it seems to be troubling a lot of enthusiast out there. On one of the Facebook groups there was a guy that said he changed out the fuel pump control module and it solved his problem

https://www.fcpeuro.com/products/bmw...it-16147229173

I know this has to be coded to the car when you replace it. What are the community thoughts about this?

You can always try to buy a used one and have it coded just to see if it resolves your issue then replace it with a brand new unit:


https://www.ebay.com/itm/293515114203

[Bimmer_Bro]

Originally Posted by iqraceworks

I'm running the MHD Stage 2+ 93 tune......been running it for months.

Which Version tho? V7? V8.1? V9?
I was having weird throttle issues on Version 9. Switched back to V7 and butter smooth.

[iqraceworks]

Originally Posted by Bimmer_Bro

Which Version tho? V7? V8.1? V9?
I was having weird throttle issues on Version 9. Switched back to V7 and butter smooth.

V7

I installed a new low pressure fuel pump a few weeks ago, and I haven't had any more issues. I'm not sure that was the problem, but as of right now it seems to be fixed.

[Kyrie535]

Originally Posted by iqraceworks

The light surging type issue I can seems to have gone away after my new LPFP. I'm not convinced that was the problem.....but until it does it again, that's all I have to go on.

Okay so I’ve had the rpm oscillation for a while now, i did some digging around because my transmission needed to be maintained, basically people said it’s the transmission solenoids, they reported the same problem as me and hopefully you, the 1100-2000k rpm flutter (oscillation) of around 200rpm that went away after replacing valve body solenoids, in about a week or so I’m gonna replace the fluid and all the rubber seals to see if that fixes anything if it doesn’t I will be replacing the solenoids

Have you had any other symptoms? Like for me shifting from 1-2 is terrible, and shifting down from 3-2 i get a hard jerk, WOT is perfect and so is the car over like 2200rpm but yeah the shifts are pretty sloppy, I’m hoping it’s just the Valve body seals or solenoids and I don’t have to go digging in the valve body to replace zip kit, either way shouldn’t be too bad, hope this helped.

This forum explains a little bit of the rpm issues, but if you want to replace solenoids or just change fluid this helps a whole lot, there’s other threads inside of this one that help as well

https://www.e90post.com/forums/showthread.php?t=1193573


This forum is doing a sonnax zip kit/ VB rebuild but it talks about the rpm issues a little more (in both forums the problems went away but if I were you I’d start with just fluid and seal change, then solenoids, if that doesn’t work then do the sonnax zip kit unless you want to take apart your VB before checking off other plausible things , because it’s a long process, some people do it all in 1 go but I’m not gonna do it unless nothing else works)

https://www.e90post.com/forums/showthread.php?t=1318219

[Saif2018]

Originally Posted by Kyrie535

Okay so I’ve had the rpm oscillation for a while now, i did some digging around because my transmission needed to be maintained, ile put the forum link if anyone wants but basically people said it’s the transmission solenoids, they reported the same problem as me and hopefully you, the 1100-2000k rpm flutter (oscillation) of around 200rpm that went away after replacing valve body solenoids, in about a week or so I’m gonna replace the fluid and all the rubber seals to see if that fixes anything if it doesn’t I will be replacing the solenoids

Have you had any other symptoms? Like for me shifting from 1-2 is terrible, and shifting down from 3-2 i get a hard jerk, WOT is perfect and so is the car over like 2200rpm but yeah the shifts are pretty sloppy, I’m hoping it’s just the Valve body seals or solenoids and I don’t have to go digging in the valve body to replace zip kit, either way shouldn’t be too bad, hope this helped.

This forum explains a little bit of the rpm issues, but if you want to replace solenoids or just change fluid this helps a whole lot, there’s other threads inside of this one that help as well
https://www.e90post.com/forums/showthread.php?t=1193573

This forum is doing a sonnax zip kit/ VB rebuild but it talks about the rpm issues a little more (in both forums the problems went away but if I were you I’d start with just fluid and seal change, then solenoids, if that doesn’t work then do the sonnax zip kit unless you want to take apart your VB before checking off other plausible things , because it’s a long process, some people do it all in 1 go but I’m not gonna do it unless nothing else works)
https://www.e90post.com/forums/showthread.php?t=1318219

If your going to do the transmission seals, pan/filter, oil, then you might as well properly service the transmission and do the solenoids as well,

Makes a good difference to the gearbox.

Replacing solenoids isn't a massive job and is recommended.

[Kyrie535]

Originally Posted by Saif2018

If your going to do the transmission seals, pan/filter, oil, then you might as well properly service the transmission and do the solenoids as well,

Makes a good difference to the gearbox.

Replacing solenoids isn't a massive job and is recommended.

By properly service you mean I should do the zip kit? If I have to do the solenoids, because the fluid and filter are already in transit

Im planning on doing the solenoids just need to wait a little bit because I’m 18 working part time

[iqraceworks]

Originally Posted by rush jamaica

I’m having this problem also anyone got any solid info on the fix

I can't say for certain that it was the fix......but my car hasn't done that surging on the highway during low throttle cruising since I replaced the LPFP a few months ago.

Unfortunately, I was never able to run a log at the exact time when it was happening......so I can't say if it was actually fuel related, or something else.

[iqraceworks]

Originally Posted by Kyrie535

By properly service you mean I should do the zip kit? If I have to do the solenoids, because the fluid and filter are already in transit

Im planning on doing the solenoids just need to wait a little bit because I’m 18 working part time

I would not mess with the Zip kit. Just do the seals, solenoids, and fluid/filter. Some of the transmission shops I've talked to that specialize is ZF transmissions have told me that sometimes the Zip kits cause more problems than they fix. Plus, if you download the install manual you will see that it's a royal pain.....lots of chances to make mistakes and install something in the wrong spot. The entire valve body has to be disassembled.....

Most of the time the seals and/or the solenoids are the problem.