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Old 01-25-2013, 02:16 PM   #681
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A few things I learned about my experience.

Symptom: rough idle, running rich and stalling. AFRs in the 10s or even less. Depending when the unit Vanos failed the car will run either great at top end and crap below or the opposite. Mine was at the low rpm range.

Cause: failed circuit board for controlling Vanos. Results in cams being stuck in retarded or advanced position changing the VE of the engine and hence fuel problems. Design flaw by BMW. Vanos valve body prone to clogging and causing the cams to not respond within spec.

Fix: replace Vanos selinoid and valve body.

Symptom: Fluctuating rich warm idle 11 to 12 cold idle 10 to 11... Fluctuating AFRs while cruising. Full throttle and boost is fine.

Cause: TPS sensors tend to ware out in the lower ranges causing flat spots in driving and response. Also may change the base TPS voltage which causes the AEM to be off its fuel map at part throttle and idle. Also power/ ground noise effects the TPS signal which in-turn will cause the AEM to richen the fuel thinking its accelerating when it's just at idle triggering the Accel fuel enrichment. Also the AEM will jump the fuel map from the spikes in TPS voltage and the AEM will think its supposed to be at a higher throttle position than it should be for the VE. As a result will cause the AFR to jump all over and be rich at both idle and part throttle. Full throttle will not be affected

Fix: TPS sensors possibly. Alternator sending out a noisy signal voltages fluctuating from 11 volts to 13 yet the alternator is working even when tested... Replace alternator check for any electrical add ons such such angel eyes ,stereo etc... Having the AEM logs is a big benefit to monitor what's going on. May have to send AEM to HPF. If u have a scope u could get around that... I had to modify my AEM TPS base voltage and Accel sensitivity to compensate for new voltages. Easy to do but need HPF or an unlocked AEM. Also GT1 tool TDK test, just to set up BMW computer to recognize new TPS Voltage range and checks all sensors / throttles r within operating spec. I found that my throttles were slow as per the TDK test as such the throttles needed lubricating with silicone spray, which brought them back within spec.

HPF and those on this forum have been instrumental in helping me diagnose and resolve these issues and I am very greatful for all your support. It reminds me when I used to do club racing and the support we all had as a community of enthusiasts. This is why I love cars... I hope my experience can help others as I have been helped.
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Old 01-25-2013, 02:20 PM   #682
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Quote:
Originally Posted by Commanderwiggin View Post
Great work man!
Thanks I appreciate it... U have been a great help and support. Ran the car today for a few hours and logged a bunch of data... Logs look great. Runs fantastic I am a very happy man.
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Old 01-25-2013, 02:53 PM   #683
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Quote:
Originally Posted by being3 View Post
A few things I learned about my experience.

Symptom: rough idle, running rich and stalling.

Cause: failed circuit board for controlling Vanos. Results in cams being stuck in retarded or advanced position changing the VE of the engine and hence fuel problems. Design flaw by BMW. Vanos valve body prone to clogging and causing the cams to not respond within spec.

Fix: replace Vanos selinoid and valve body.

Symptom: Fluctuating rich warm idle 11 to 12 cold idle 10 to 11... Fluctuating AFRs while cruising. Full throttle and boost is fine.

Cause: TPS sensors tend to ware out in the lower ranges causing flat spots in driving and response. Also may change the base TPS voltage which causes the AEM to be off its fuel map at part throttle and idle. Also power/ ground noise effects the TPS signal which in-turn will cause the AEM to richen the fuel thinking its accelerating when it's just at idle triggering the Accel fuel enrichment. Also the AEM will jump the fuel map from the spikes in TPS voltage and the AEM will think its supposed to be at a high throttle position than it should for the VE as a result cause the AFR to jump all over and be rich at both idle and part throttle.

Fix: TPS sensors possibly. Alternator sending out a noisy signal voltages fluctuating from 11 volts to 13 yet the alternator is working even when tested... Replace alternator check for any electrical addictions such such angel eyes ,stereo etc... Having the AEM logs is a big benefit to monitor what's going on. May have to send AEM to HPF. If u have a scope u could get around that... I had to modify my AEM TPS base voltage and Accel sensitivity to compensate for new voltages. Easy to do but need HPF or an unlocked AEM. Also GT1 tool TDK test, just to set up BMW computer to recognize new TPS Voltage range and checks all is within operating spec. I found that my throttles were slow as per the TDK test as such the throttles needed lubricating with silicone spray, which brought them back within spec.

HPF and those on this forum have been instrumental in helping me diagnose and resolve these issues and I am very greatful for all your support. It reminds me when I used to do club racing and the support we all had as a community of enthusiasts. This is why I love cars
These symptoms and resolutions should be a sticky!!!

Love the persistence you carried throughout your ordeals, you are a TRUE enthusiast my friend
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Old 01-25-2013, 09:58 PM   #684
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A video I put together of the AEM data logger I setup to view my recent logs...

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Old 01-28-2013, 12:16 AM   #685
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Did a fair amount of driving yesterday & today.. Lots of logs... One thing I noticed is I needed a really fast computer to keep up with the AEM... My old net book didn't cut the mustered. So it's been replaced... Much better to analyze data with a fast laptop... Car runs very strong and with the colder weather it just flys with ease... Not that it didn't before...lol. Also scary as traction is only found in 5th pointed straight ... Looking forward to the warmer weather in a few months...
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Old 01-28-2013, 12:23 AM   #686
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Awesome
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Old 01-28-2013, 02:14 AM   #687
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Finally you made it! Great work!
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Old 01-28-2013, 10:31 AM   #688
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Finally you made it! Great work!
Thanks... It certainly is a relief...
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Old 02-01-2013, 01:45 PM   #689
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Just had the car at the tuners. Made a few small changes for drivability and the car is now running better than ever. They will be doing the 94 octane and 50/50 Water / Meth tune. Ill post the dynos when I have it done. Waiting on HPF for my 6766 upgrade.
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Old 02-01-2013, 02:07 PM   #690
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Just had the car at the tuners. Made a few small changes for drivability and the car is now running better than ever. They will be doing the 94 octane and 50/50 Water / Meth tune. Ill post the dynos when I have it done. Waiting on HPF for my 6766 upgrade.
Nice! Go for a dual ball bearing imo.
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Old 02-01-2013, 05:10 PM   #691
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Nice! Go for a dual ball bearing imo.
What r ur thoughts on duel BB verses regular ?
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Old 02-01-2013, 05:12 PM   #692
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Got the best mileage out of an M3 to date including my stock one. 13 litres per hundred combined city and hwy and I wasn't driving like a granny. Although my grandma had a lead foot. Lol
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Old 02-01-2013, 05:19 PM   #693
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What r ur thoughts on duel BB verses regular ?
The DBB has less lube oil flow requirements and I've found my DBB was alot more robust than my journal especially at elevation. Just my experience...many can argue this/that. Spool/peak hp differences between different bearings aren't anything to really care about imo.
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Old 02-01-2013, 06:07 PM   #694
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Iphone fail
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Old 02-02-2013, 04:57 PM   #695
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Iphone fail
???
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Old 02-02-2013, 06:05 PM   #696
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???
It was a double post iphone fail
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Old 02-09-2013, 07:48 PM   #697
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Took some cruising AFR video

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Old 02-10-2013, 12:01 PM   #698
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Installed AEM serial guage and moved my AFR mirror setup to a more functional position.

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Old 02-10-2013, 12:49 PM   #699
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Good stuff!
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Old 02-10-2013, 02:25 PM   #700
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More video on the AEM serial gauge setup

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