[Taskmaster]

Guys, I don't get it - Anyone local want to swap and compare cars and let me know if it's in my head?

http://www.e90post.com/forums/showthread.php?t=1071502
http://www.e90post.com/forums/showthread.php?t=1099189

Issues I've had and been having: Poor performance, replaced Valvetronic sensor, and top/mid range power dramatically improved (the car even sounds different, more bass and boomy)


Low end STILL feels weak, but on occasion (most of the time) the low end seems softer and then suddenly(and only sometimes) the power will hit instantly. Anyone experience this?

I tried replacing BOTH intake and Exhaust solenoids and resetting adaptations, currently the car has the CEL with the half engine sign - would this have anything to do with reduced performance?

I just don't know what else to do at this point, from 2000-3000RPM, the car just don't feel as strong as it should (or did) and then the power picks up, and finally at the final DISA change over the car REALLY picks up.

If I datalogg is there a way to compare cam timing events to what everyone else has?

hassmaschine or mbanks21 anyone?

[TheSt|G]

Have you tried reverting to the stock tune?

[Taskmaster]

Originally Posted by TheSt|G

Have you tried reverting to the stock tune?

Actually a good idea, I'll give that a try tonight.

[mmmnot]

Originally Posted by TheAxiom

I tried replacing BOTH intake and Exhaust solenoids and resetting adaptations, currently the car has the CEL with the half engine sign - would this have anything to do with reduced performance?

Yes. I would suggest it is in 'limp mode'.

I wish I could offer more, but I don't want to assume more and be wrong and waste your time and money.

[Taskmaster]

Originally Posted by mmmnot

Yes. I would suggest it is in 'limp mode'.

I wish I could offer more, but I don't want to assume more and be wrong and waste your time and money.

Well, that's two suggestions:

Remove the tune, reset the adaptations again and clear the codes. Does the code for

2cfb
2d09

Throttle valve adaption value
Throttle Valve

Cause a limp mode?
(I assume these are them still)

[bimmerquick43321]

don't like to assume, but for here we go:

for the car that feels weaker at lower rpms and than suddently power will hit:
some reason this sounds more like an electrical issue, have you replaced your coilpacks recently? How about your sparkplugs, have you inspected them ? reason I'm asking is that I had some missfires caused by a cracked plug


half engine symbol and error codes:
if I remember correctly the half engine symbol is not related to "limp mode" but it's in regards the throtle related codes that you're getting, it drives me crazy though, cause I had the exact same symbol last summer and I'm not sure why it happend, but my theory is that I reset the throtle adapations incorrectly (I think the car was running or something lol, I know not smart), than I got the symbol and from what I remember similar codes, so I cleared the codes and reset the throtle adaptaions (correctly this time), codes went away and so did the symbol.... this doesn't mean obviously that you have the same issue, just sharing what happend to me

[Taskmaster]

I've replaced both vanos solenoids, Valvetronic sensor AND an exhaust camshaft positioning sensor, as well as all the coils and spark plugs.

I'll try removing the tune, clearing the adaptations (where the CEL/symbol came from originally) and go from there.

[bimmerquick43321]

Originally Posted by TheAxiom

I've replaced both vanos solenoids, Valvetronic sensor AND an exhaust camshaft positioning sensor, as well as all the coils and spark plugs.

I'll try removing the tune, clearing the adaptations (where the CEL/symbol came from originally) and go from there.

So you got the codes/symbol after reseting adapations? If that's the case, than it's exactly what hapened to me, as mentionned, I did the following:
1. Cleared the codes
2. Reset the adaptations again (throtle mainly of course)
Never had the issue again.

For the sparkplugs, yeah mine were new too, but for some reason one of them was cracked (the white ceramic part), which I didn't notice when installing it.... but again theres a very good possibility that your lower rpm/missing torque issue is not related to the codes...

[mmmnot]

Originally Posted by mecbain

So you got the codes/symbol after reseting adapations? If that's the case, than it's exactly what hapened to me, as mentionned, I did the following:
1. Cleared the codes
2. Reset the adaptations again (throtle mainly of course)
Never had the issue again.

For the sparkplugs, yeah mine were new too, but for some reason one of them was cracked (the white ceramic part), which I didn't notice when installing it.... but again theres a very good possibility that your lower rpm/missing torque issue is not related to the codes...

One thing I DO know for fact and experience.

Shadow codes CAN come up from the past and bite you.

I was on a Dyno and I got ABS, (and a few other's) errors and engine light errors even after off the dyno. I ran a code scanner, found nothing. Used BMS's cable and software and found several 'shadow codes' still in the memory. I was able to clear them and all my lights went away, and have yet to return months later.

Now, I feel like I've offered something - I can crack open this beer.

Edit: This tool: http://burgertuning.com/scanner.html

[hassmaschine]

If I were you I'd get an INPA cable/laptop setup and pull the codes. none of the "simple" code readers seem to tell you everything.

there could be issues related to the throttle or something but without knowing the codes we are just guessing.

[Taskmaster]

Originally Posted by hassmaschine

If I were you I'd get an INPA cable/laptop setup and pull the codes. none of the "simple" code readers seem to tell you everything.

there could be issues related to the throttle or something but without knowing the codes we are just guessing.

I have BMW logger which does pull shadow codes, I'll run them again tonight.

[rhombus]

Throttle codes show up when you reset all adaptations, or even just the intake tube adaptations. Clear the codes and do the gas petal proceedure (key on, click to run without starting, hold down gas petal for 30 seconds 3 times).

The throttle body is sometimes known to get water in the sensor, but this is less likely since you got these codes after an adaptation reset.

My next suggestion would be MAF. If the MAF is reading incorrectly (due to oil on the sensor, or a leak), it will pull timing and pull power.

[mlifxs]

when you reset the adaptations, did you use that free software?
if yes...
They have a page on this. You can get that engine warning (I did) if the software does not work correctly. They advise going through the manual process of put key in, hold down gas pedal for 30+ seconds etc. When I got the engine warning, I went through the manual process and it cleared.

edit sorry to repeat Rhombus

[thomas88162]

As far as I am concerned with respect to diagnostics, INPA or bust. It's simply the program made for the cars, works brilliantly and never fails to perform a process at least without notifying you of it. INPA makes diagnosing a lot easier than it otherwise would be.

[Taskmaster]

Cleared all codes, did the pedal technique like suggested and drove it hard. Then the car started to surge and lose power or hit a "rev limit" and sit there, or come abruptly back on throttle when I stepped on the gas a little.

I ran the software again and came back with 2D06 - Mass Air system.

Edit: If anyone has the MSV80.IPO, I would like it please!

[hassmaschine]

dirty or defective MAF?

you could try just unplugging it and see how it runs.

[Taskmaster]

Originally Posted by hassmaschine

dirty or defective MAF?

you could try just unplugging it and see how it runs.

I did that, car gets the half engine symbol and reduced power. I have a backup MAF, but I'll try cleaning this one first. I put in a new K&N for the Dinan intake, that could be the issue.

[TheSt|G]

If its already failing its not an issue, but generally MAF cleaner ends up killing MAFs.

[thomas88162]

Is the K&N oiled? Drop it if it is.

[Tom Droze]

Originally Posted by TheAxiom

I did that, car gets the half engine symbol and reduced power. I have a backup MAF, but I'll try cleaning this one first. I put in a new K&N for the Dinan intake, that could be the issue.

So... Did all these issues come about after you installed the K&N filter?

Here is my feeling toward K&N filters, when you put an oiled element in front of a MAF bad things can happen. Which is why when I bought my Dinan Ram Air intake, which came with a K&N air filter, I spent an additional $90 for an AFE dry element air filter.

[hassmaschine]

I have two cars with K&Ns and no issues, but maybe it was over oiled.

[Taskmaster]

I'm at work now, so no* more diagnostics until I get off, but it wouldn't surprise me if it came over oiled.