[speedychuck2]

Originally Posted by bartbes

I changed spark plugs, turbo's, coils, injectors, all van lines, dv's, boost solenoids, wallnut blast, transmission fluid and still exact same problem that goes away a few days after adaption reset with inpa. Pure stage 2 ron102+meth with a custom tune. Runs perfect at wot. I REALY hope someone finds a fix. Just drives like crap, its like the AT cant predict what is coming so shifts at low speeds are also very wonky at times. I suspect the hpfp and/or torque convertor, because i cant think of anything else and tuner thinks it is a hardware issue

I don't think it's torque converter related. I am 6MT and have the issue.

Buraq suggested vanos and PID config as the issue within the map. Don't know how true it is, but in the MHD thread we have got as far as martial saying to take logs and send to ken. I know that's not great for you as you have a custom map but it's worth keeping an eye on.

I'm wondering if it's more related to air metering. Something to do with map sensors perhaps?

[bartbes]

I know youre right, but nu torque convertor is getting bad so made me thinking it had something to do with it.

Ken did my custom tune and i sent him a log of the event a while back. He sugested to reset adaptions with inpa, and that there might be a chance it is hpfp related because mine didnt look good in the logs.

I also installed a n20 tmap and new maf sensor

[speedychuck2]

I'm going to get a custom map before too long from bq, hopefully that will show some differences. Maybe it's something ken has written into his maps unwillingly.

[bartbes]

Is it only wedge custom tune and mhd ots cars that are having this problem then? I thougt it occured with other tunes and even with stock cars?

[Hoper]

I've had very similar problems, have replaced plugs, coils, diverter valves, boost solenoids, vacuum hoses, vanos solenoids and reset the adaptations through INPA on a number of occasions

My logs show I probably have at least one leaky injector so index 11 injectors going in this weekend along with Catless DP's, if that doesn't fix it I'll probably change the O2 sensors, but they're not throwing codes...

I'll update after I fit the injectors and code them etc, have to admit not 100% convinced it'll fix the issue

[bartbes]

I have already installed new injectors and 02 sensors, didnt fix it

[speedychuck2]

Originally Posted by bartbes

Is it only wedge custom tune and mhd ots cars that are having this problem then? I thougt it occured with other tunes and even with stock cars?

I didn't think so. Are you getting the sudden surge in power too, as you graduly apply throttle? Like the car takes off for no reason?

[bartbes]

No. Every form of applying throttle when locked in one gear makes the problem disappear. Only in low gears it feels like it can not predict power at shift points so it bucks sometimes and other times its smooth. The surging is also more noticable when driving in m mode in 1st or 2nd gear

[Rivers]

Make sure you guys check your maf sensor on your chargrpipe it maybe gunked up with oil if you dont have a catch can.

I had the same problem with the slight jerkiness during light throttle. I checked the maf and found out it was covered in oil and the sensor itself was broken in half. I since then replaced the sensor and installed a catch can no problems ever since then

[Tangent]

Originally Posted by Rivers

Make sure you guys check your maf sensor on your chargrpipe it maybe gunked up with oil if you dont have a catch can.

I had the same problem with the slight jerkiness during light throttle. I checked the maf and found out it was covered in oil and the sensor itself was broken in half. I since then replaced the sensor and installed a catch can no problems ever since then

Umm, the N54 doesn't have a MAF sensor...

[Sgop335]

Originally Posted by Tangent

Umm, the N54 doesn't have a MAF sensor...

Fwiw think he means tmap

[Rivers]

Originally Posted by Sgop335

Fwiw think he means tmap

Yes!

[Hoper]

Originally Posted by Rivers

Yes!

Yes checked that when I installed the new diverter valves, no dice, mine was nice and clean :

[JMonteil]

Had almost the exact same thing, car felt like a POS unless boost was building. So basically between 1500-2500rpm. Ragged it out till I got a VANOS code. Replaced both and now it runs smooth as new. Better gas mileage and idle as well. Something to consider.

[speedychuck2]

Originally Posted by JMonteil

Had almost the exact same thing, car felt like a POS unless boost was building. So basically between 1500-2500rpm. Ragged it out till I got a VANOS code. Replaced both and now it runs smooth as new. Better gas mileage and idle as well. Something to consider.

I'm presuming by both you mean both vanos solenoid? Definitely something worth trying given what they cost and the fact that they'll need doing sooner or later anyway. Will look into this.

[Hoper]

Installed the new catless DPs and injectors, still have the hesitation, replaced my Vanos solenoids a while back, didn't use originals though, so maybe I should buy some of the real deal...

[bartbes]

I installed new oem vanos solenoids, along with everything else mentioned here. Still the same problem. Only hardware remaining is hpfp, and it does throw a 2aaf code sometimes

[Hoper]

Originally Posted by bartbes

I installed new oem vanos solenoids, along with everything else mentioned here. Still the same problem. Only hardware remaining is hpfp, and it does throw a 2aaf code sometimes

Man this issue sucks, love the car and this is the only thing that's letting it down.

Is anyone who's having this issue not running an MHD tune? just checking as would like to eliminate that as the issue

And I don't get the issue when the car is cold, so when it's running richer there's no issue, so a simple fix would seem to be a richer AFR between 1400 and 2500 RPM with light throttle application?

[Sgop335]

Dont have this issue. I did change my torque request tables. Wonder if thats the reason. If anyone wants to try. I do think if you have boost leaks it can do this..

[Hoper]

Originally Posted by Sgop335

Dont have this issue. I did change my torque request tables. Wonder if thats the reason. If anyone wants to try. I do think if you have boost leaks it can do this..

I don't think I have a boost leak, but have posted a link to a log below

http://www.datazap.me/u/hoper/catless-dps

You can clearly see the boost fluctuating though before I apply any real throttle, and when looking at the logs the LTFT for bank 1 follows the pattern for the boost, the throttle position also fluctuates even though the pedal position is stable...

Ideas? is it a small boost leak?

[RSL]

Originally Posted by Hoper

Man this issue sucks, love the car and this is the only thing that's letting it down.

Is anyone who's having this issue not running an MHD tune? just checking as would like to eliminate that as the issue

And I don't get the issue when the car is cold, so when it's running richer there's no issue, so a simple fix would seem to be a richer AFR between 1400 and 2500 RPM with light throttle application?

Does your car run richer when below operating temp?

Originally Posted by Sgop335

Dont have this issue. I did change my torque request tables. Wonder if thats the reason. If anyone wants to try. I do think if you have boost leaks it can do this..

+1 and a few others might help.

Originally Posted by Hoper

I don't think I have a boost leak, but have posted a link to a log below

http://www.datazap.me/u/hoper/catless-dps

You can clearly see the boost fluctuating though before I apply any real throttle, and when looking at the logs the LTFT for bank 1 follows the pattern for the boost, the throttle position also fluctuates even though the pedal position is stable...

Ideas? is it a small boost leak?

1) That's some seriously low ambient pressure. OTS maps and high altitude/consistent low pressure don't mix well too often. You actually seem to be doing pretty well on boost considering.
2) Not sure what you're doing with the pedal, but you don't even get it mostly floored until >5000rpm and have what appears to be full load request around 4000rpm (68% pedal).
3) You have a huge throttle closure 3100-3200rpm due to load exceeding request. That is essentially what it's doing on a small scale repeatedly at the part-throttle immediately before.

If MHD still has a linear throttle option, you might give it a try and see if things smooth out.

WGDC might be a tad high for boost, but expected with such low pressure. Doesn't really seem like a boost leak.

[Hoper]

Originally Posted by RSL

Does your car run richer when below operating temp?

+1 and a few others might help.

1) That's some seriously low ambient pressure. OTS maps and high altitude/consistent low pressure don't mix well too often. You actually seem to be doing pretty well on boost considering.
2) Not sure what you're doing with the pedal, but you don't even get it mostly floored until >5000rpm and have what appears to be full load request around 4000rpm (68% pedal).
3) You have a huge throttle closure 3100-3200rpm due to load exceeding request. That is essentially what it's doing on a small scale repeatedly at the part-throttle immediately before.

If MHD still has a linear throttle optiocn, you might give it a try and see if things smooth out.

WGDC might be a tad high for boost, but expected with such low pressure. Doesn't really seem like a boost leak.

Ahh yes forgot to mention road was wet so couldn't just floor it, will do another log on dry roads in the next few days

and yep I'm at around 650m or 2100ft so altitude could be playing a part

why would load exceed request? what generally causes that to happen?

Thanks very much for your help, really appreciated

Whoops just checked, the throttle closure is me changing gears, 3rd to 4th sorry should mention its a manual and yep I can see the load actual fluctuating up and down above and below the load request at light throttle, that'd be why its surging so just need to know why its going above the request...

and yep have the linear throttle option on, might turn it off and reset the adaptations, come to think of it I haven't reset them since replacing and coding the injectors and fitting the DPs, should do that...