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      04-29-2015, 06:36 AM   #1
thezone135i
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Walnut Blasting/Now Limp Mode Under Hard Acceleration

Hey guys,

Got my engine walnut blasted a few weeks back at Active Motorwerke in Burwood and I could feel the xtra power straight away. But over a period of 2 or 3 weeks after this new issue has developed and is getting worse. When I accelerate hard and as the revs and boost rise the engine seems to surge quite abruptly and goes into limp mode, requiring a restart. I will take it in and get it looked at soon when I have the time but juts thought id put it out there if anyone has had the same issue.

Its stock apart from Cobb aggressive and has 94k on the clock now.

Coils and/or plugs perhaps?

Cheers
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      04-29-2015, 06:38 AM   #2
totti84
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I had a similar problem... you need to do the throttle adaptation reset

It's quite simple if you google
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      04-29-2015, 06:59 AM   #3
thezone135i
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That simple? Holy crap Ill have to give it a try.
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      04-29-2015, 07:06 AM   #4
totti84
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IIRC its something like keep your foot on throttle, turn on ignition (reds only) for 30 seconds, then turn off ignition.. and your done!
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      04-29-2015, 07:49 AM   #5
thezone135i
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I followed these steps:

1. Never touch the break pedal & key remains inserted the entire time
2. Insert key and push START Button
3. Press and HOLD accelerator pedal for 30 seconds (some say 5, some say 25 seconds - I did 30 to be sure).
4. WITHOUT RELEASING THE ACCELERATOR PEDAL, push the START Button
5. Release accelerator pedal
6. Wait full 2 minutes
7. Start car normally

Took the car for a spin. Didnt do shit. It feels mechanical, like the power is struggling to get thru the diff or something, its kind of tuggin at the rear like it doent want to put all the power down and if I back off its ok but if I keep hammering for more it goes into limp mode.

ill have to get it looked at.

thanks anyway.
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      04-29-2015, 05:57 PM   #6
totti84
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Are you getting any engine lights or codes?
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      04-29-2015, 08:01 PM   #7
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Firstly, check if you got any codes and post them up. Then do some logging of it occurring and post the .csv file here (if cobb allows for logging).

Sounds to me like a misfire as it's happening at WOT, so the standard plugs/coils
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      05-02-2015, 08:18 PM   #8
thezone135i
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Quote:
Originally Posted by 7smurfs View Post
Firstly, check if you got any codes and post them up. Then do some logging of it occurring and post the .csv file here (if cobb allows for logging).

Sounds to me like a misfire as it's happening at WOT, so the standard plugs/coils
Cheers 7smurfs and totti84.

The cobb shows these error codes below. Iíve had a bit of google search (possible solutions in brackets) but I think rather than worry about what these all mean Iíll just get my plugs and coils done as the car has done 94k and see if that fixes my issue. Some people are saying to change your plugs every 25,000km when tuned?

P29D1 - Misfire Cyl 5 (Change Plugs and/or coils)
P2F9E - Thermal Oil Level sensor (Top up oil)
H2F9E - I think this is also Thermal Oil Level sensor
H30EE - Heavy knock? (No idea)
H2FDB - Short circuit or signal interruption (un-marry cobb, update maps and cobb software, reinstall tune)
H29DO Ė (No google result!)

Cobb does allow for logging, just not sure which parameters to log?
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      05-02-2015, 09:30 PM   #9
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Quote:
Originally Posted by thezone135i View Post
Cheers 7smurfs and totti84.

The cobb shows these error codes below. Iíve had a bit of google search (possible solutions in brackets) but I think rather than worry about what these all mean Iíll just get my plugs and coils done as the car has done 94k and see if that fixes my issue. Some people are saying to change your plugs every 25,000km when tuned?

P29D1 - Misfire Cyl 5 (Change Plugs and/or coils)
P2F9E - Thermal Oil Level sensor (Top up oil)
H2F9E - I think this is also Thermal Oil Level sensor
H30EE - Heavy knock? (No idea)
H2FDB - Short circuit or signal interruption (un-marry cobb, update maps and cobb software, reinstall tune)
H29DO Ė (No google result!)

Cobb does allow for logging, just not sure which parameters to log?
I noticed my car was a little off after having the walnut blast done which was certainly not what I expected. I drove for a day but nothing improved.

I also had 8 errors logged on my cobb when I checked but I assumed they we're all related to the multiple sensor disconnect/reconnect etc so didn't worry about it.

To solve my issue I just cleared the errors, flashed it to another map (any map - just flashed didn't drive) then flashed it back to my original map.

After another day of driving under varying conditions I can say its not only back to normal but improved, much smoother and the throttle response is much better. I'm assuming the re flashing allows the DME adaptations to reset.

Worked for me.
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      05-03-2015, 01:26 AM   #10
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I'm pretty confident to say 6 new spark plugs and replacing the coil in cyl 5 should fix the problem.

When you run Cobb aggressive map, the plugs foul much quicker. When were the last time the plugs were replaced?

Anyhow, take it back to AM and they will sort it out for you.
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      05-03-2015, 02:12 AM   #11
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Quote:
Originally Posted by 1MOz View Post
I'm pretty confident to say 6 new spark plugs and replacing the coil in cyl 5 should fix the problem.

When you run Cobb aggressive map, the plugs foul much quicker. When were the last time the plugs were replaced?

Anyhow, take it back to AM and they will sort it out for you.
Yeah you are right. I had mine go limp under WOT on highway, took it into advan and he replaced plugs and coils and never had the issue again
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      05-03-2015, 02:50 AM   #12
thezone135i
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Cheers fellas. Will do this and report back!
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      05-03-2015, 04:00 AM   #13
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change the plugs!
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      05-03-2015, 06:01 AM   #14
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Quote:
Originally Posted by dh58 View Post
Yeah you are right. I had mine go limp under WOT on highway, took it into advan and he replaced plugs and coils and never had the issue again
Yup, same for mine and I have only done around 25000kms at the time it happened. Peter did the same and it's all sweet since.
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      05-03-2015, 07:02 AM   #15
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Quote:
Originally Posted by 1MOz View Post
Yup, same for mine and I have only done around 25000kms at the time it happened. Peter did the same and it's all sweet since.
25000kms seems too soon, is this normal when tuned?
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      05-03-2015, 07:55 PM   #16
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Definitely clear the codes and then see what comes back.

As said, keep in mind disassembling stuff in the engine bay will throw codes naturally.
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      05-04-2015, 07:38 AM   #17
thezone135i
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Quote:
Originally Posted by 7smurfs View Post
Definitely clear the codes and then see what comes back.

As said, keep in mind disassembling stuff in the engine bay will throw codes naturally.
Cleared all codes, swapped the tune, swapped it back again. Gave it a bootful went into limp mode. Misfire cyl 5 this time.

Got it booked into Active Motorwerke on Wed to get all plugs and coils replaced.

Will report back!
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      Yesterday, 05:36 AM   #18
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Quote:
Originally Posted by TS135i View Post
25000kms seems too soon, is this normal when tuned?
Pete said it can be for a tuned car for just one cylinder to misfire. But it's good practice to replace all 6 plugs and the offending coil. It's an easy fix and happy days.
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      Yesterday, 06:27 AM   #19
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Quote:
Originally Posted by thezone135i View Post
Cleared all codes, swapped the tune, swapped it back again. Gave it a bootful went into limp mode. Misfire cyl 5 this time.

Got it booked into Active Motorwerke on Wed to get all plugs and coils replaced.

Will report back!
Just a thought... you did replace the intake manifold gaskets when you had the carbon cleaning done right> ?

Sounds like it is plugs/coils/injectors. (in that order). I would use BMW dealer bought plugs to avoid any issues.

Good Luck,
Dackel
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      Yesterday, 07:18 AM   #20
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Quote:
Originally Posted by Dackelone
Quote:
Originally Posted by thezone135i View Post
Cleared all codes, swapped the tune, swapped it back again. Gave it a bootful went into limp mode. Misfire cyl 5 this time.

Got it booked into Active Motorwerke on Wed to get all plugs and coils replaced.

Will report back!
Just a thought... you did replace the intake manifold gaskets when you had the carbon cleaning done right> ?

Sounds like it is plugs/coils/injectors. (in that order). I would use BMW dealer bought plugs to avoid any issues.

Good Luck,
Dackel
I have mine booked in to be done next Friday. Do most places know to replace that gasket, is it necessary? I'll chase it up with them but am just curious.
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      Yesterday, 07:22 AM   #21
totti84
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It's not entirely common practice as they are rubber seals and not paper gaskets, but for the sake of $30ish extra I would recommend it for the peace of mind
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