[srey]

I just got done doing a walnut blast, vanos solenoid cleaning, belt tensioner and pulleys, OFHG, OPG, vacuum hoses, shocks, struts, and installed DCI. I've driven 40 miles and the car runs great. This afternoon after the engine was at operating temperature I did a WOT pull on an onramp. The engine malfunction warning came up. I've had it happen before, so I knew what to expect, but this time was different. There was no decrease in power (still pulled hard and had boost) and there were no codes. I restarted the car and everything g was normal. Checked using INPA and no stored codes.

I have two ideas of what may have caused it. I just did a coolant flush, and didn't have enough coolant after burping the system. I added more, but didn't burp it again because I had to go fo something right at that moment. So maybe high engine temp. I also just added DCI, so maybe that contributed to the problem.

i did all this maintenance in preparation for doing an MHD OTS tune. i just purchased the logging tool. I suppose that could help if it happens again from a diagnostic standpoint. Any other ideas? I'm not too concerned, but defer to the forum's experience.

[srey]

If it helps ambient air temp was 70* and 4800' above sea level

[srey]

So I decided to flash MHD Stage 1+ 91 oct, and I've finally gotten a code... 30FF. I just did some auto logging and it looks like I'm consistently 1-2 psi below boost target. I'm confused. I assume it would help if I did a manual log and posted it in n the MHD thread. What else could be causing a 30ff code if it's not boost pressure actually being low? Boost solenoids?

[Milan]

If it was me I would do (in this order):

1) All vacuum lines
2) Double and triple check the canisters for vacuum and the hard lines under the valve cover
3) Boost solenoids

If none of those fix it get ready to spend some $$$

[srey]

Originally Posted by Milan

If it was me I would do (in this order):

CHECK 1) All vacuum lines
CHECK 2) Double and triple check the canisters for vacuum and the hard lines under the valve cover
3) Boost solenoids

If none of those fix it get ready to spend some $$$

Thanks for the reply. I'm going to test the boost solenoids next. It could be the OEM charge pipe too. I think I'll be able to do that the same time time I test the boost solenoids.

I found this thread really helpful.

http://www.e90post.com/forums/showthread.php?t=1293572

[TemjinX2]

i agree check the oem charge pipe...it gets brittle over time and the increase boost from the tune could have caused small cracks.

if you have any spare line left...you can try bypassing the canisters as well...some times the canisters themselves can develop leaks since its plastic as well.

[Milan]

Originally Posted by srey

Thanks for the reply. I'm going to test the boost solenoids next. It could be the OEM charge pipe too. I think I'll be able to do that the same time time I test the boost solenoids.

I found this thread really helpful.

http://www.e90post.com/forums/showthread.php?t=1293572

What part of Idaho are you in?

[srey]

Originally Posted by Milan

What part of Idaho are you in?

I live in the country between Idaho Falls and Rigby. Not much of a German car scene here, unfortunately. I check craigslist up in your neck of the woods all the time, though.

[Milan]

How many miles on your turbos? I bet those wastegates are getting weak

[srey]

I'm not sure whether they've been replaced. I bought the car two years ago when I was living in Houston. It had 98k miles then. I have 115k now. If they're original turbos I agree they're getting tired. I was planning to rebuild them next winter. As I've been dabbling in MHD this week I'm a little concerned about what I'm getting from logs. I've only done auto-logging so far, and know I need to do a manual log of a single pull. The timing corrections seem a little disconcerting, but I don't necessarily know what I'm interpreting in the graphs. I've read the How to Read MHD Datalogs pdf, but am still learning what constitutes good and bad for the various data.

https://www.docdroid.net/IyQ24N5/int...d-datalogs.pdf

[Milan]

For stage 1+ you need an intercooler, it makes a huge difference on these cars. Also timing corrections are normal

[srey]

Originally Posted by Milan

For stage 1+ you need an intercooler, it makes a huge difference on these cars. Also timing corrections are normal

Ok. I've read that timing corrections across 3 cylinders at once is indicative of a problem. I thought it might be less than ideal gas. I can only get 91 out here, though I can find ethanol free gas pretty easy. Look at this log. This is in a stock map. Everything look normal to you?

https://datazap.me/u/chsjapanese/stock?log=0&data=3-20

[srey]

And sorry if I'm being an annoying noob. I'm just trying to learn as I go.

[marv85]

Check my reply to your post in the MHD thread! 30FFs are annoying but diagnosable if you divide and conquer. From your log I don’t believe you have a boost leak. My guess it’s boost control (vacuum lines/boost solenoids). It can also be the wastegate needing adjustment/.

[marv85]

This should help you cover the vacuum lines:

http://www.realoem.com/bmw/enUS/show...diagId=11_3975

[srey]

Originally Posted by marv85

This should help you cover the vacuum lines:

http://www.realoem.com/bmw/enUS/show...diagId=11_3975

Thanks man! I still have the scratches on my hands from doing the house from the solenoid to the front turbo. I'm hoping to narrow it down to solenoids or wastegates tomorrow, as I said in the other thread. Thanks again for your help on this.