buying a used HPF M3 - Page 35

being3 · 01-25-2013, 02:16 PM

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.

being3 · 01-25-2013, 02:20 PM

Quote:

Originally Posted by Commanderwiggin

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.

02black330ci · 01-25-2013, 02:53 PM

Quote:

Originally Posted by being3

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

being3 · 01-25-2013, 09:58 PM

A video I put together of the AEM data logger I setup to view my recent logs...

being3 · 01-28-2013, 12:16 AM

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...

TrippinBimmer · 01-28-2013, 12:23 AM

Awesome

E85head · 01-28-2013, 02:14 AM

Finally you made it! Great work!

being3 · 01-28-2013, 10:31 AM

Quote:

Originally Posted by E85head

Finally you made it! Great work!

Thanks... It certainly is a relief...

being3 · 02-01-2013, 01:45 PM

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.

Commanderwiggin · 02-01-2013, 02:07 PM

Quote:

Originally Posted by being3

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.

being3 · 02-01-2013, 05:10 PM

Quote:

Originally Posted by Commanderwiggin

Nice! Go for a dual ball bearing imo.

What r ur thoughts on duel BB verses regular ?

being3 · 02-01-2013, 05:12 PM

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

Commanderwiggin · 02-01-2013, 05:19 PM

Quote:

Originally Posted by being3

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.

Commanderwiggin · 02-01-2013, 06:07 PM

Iphone fail

being3 · 02-02-2013, 04:57 PM

Quote:

Originally Posted by Commanderwiggin

Iphone fail

???

Commanderwiggin · 02-02-2013, 06:05 PM

Quote:

Originally Posted by being3

???

It was a double post iphone fail

being3 · 02-09-2013, 07:48 PM

Took some cruising AFR video

being3 · 02-10-2013, 12:01 PM

Installed AEM serial guage and moved my AFR mirror setup to a more functional position.

Commanderwiggin · 02-10-2013, 12:49 PM

Good stuff!

being3 · 02-10-2013, 02:25 PM

More video on the AEM serial gauge setup

01-25-2013, 02:16 PM	#681
being3 Registered User Join Date: Nov 2011 Location: British Columbia Posts: 461 My Ride: HPF 2.5 M3 Vert View My Garage	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. __________________ "Horsepower is how fast you hit the wall. Torque is how far you go through it." Last edited by being3; 01-26-2013 at 12:41 PM.

01-25-2013, 09:58 PM	#684
being3 Registered User Join Date: Nov 2011 Location: British Columbia Posts: 461 My Ride: HPF 2.5 M3 Vert View My Garage	A video I put together of the AEM data logger I setup to view my recent logs... __________________ "Horsepower is how fast you hit the wall. Torque is how far you go through it." Last edited by being3; 01-25-2013 at 10:16 PM.

01-28-2013, 12:16 AM	#685
being3 Registered User Join Date: Nov 2011 Location: British Columbia Posts: 461 My Ride: HPF 2.5 M3 Vert View My Garage	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... __________________ "Horsepower is how fast you hit the wall. Torque is how far you go through it." Last edited by being3; 01-28-2013 at 10:32 AM.

01-28-2013, 12:23 AM	#686
TrippinBimmer Registered User Join Date: Jan 2008 Location: Ridgeland, MS Posts: 5,345 My Ride: ZHP Custom Stage 3.5 View My Garage	Awesome __________________ ..::\|TrippinBimmer's Boost Build with Cool Parts\|::.. 4whp/3tq SAE Corrected \| Active Autowerke \| BimmerBrakes \| VMR Wheels \| ..::\| TrippinBimmer's New Project : 1988 e30 325e \|::..

02-01-2013, 01:45 PM	#689
being3 Registered User Join Date: Nov 2011 Location: British Columbia Posts: 461 My Ride: HPF 2.5 M3 Vert View My Garage	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. __________________ "Horsepower is how fast you hit the wall. Torque is how far you go through it." Last edited by being3; 02-01-2013 at 01:48 PM.

01-28-2013, 02:14 AM	#687
E85head Registered User Join Date: Jun 2012 Location: Norway Posts: 151 My Ride: E46 M3 View My Garage	Finally you made it! Great work!

02-01-2013, 05:12 PM	#692
being3 Registered User Join Date: Nov 2011 Location: British Columbia Posts: 461 My Ride: HPF 2.5 M3 Vert View My Garage	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 __________________ "Horsepower is how fast you hit the wall. Torque is how far you go through it." Last edited by being3; 02-04-2013 at 11:54 AM.

02-01-2013, 06:07 PM	#694
Commanderwiggin Registered User Join Date: Jun 2010 Location: Calgary, Canada Posts: 3,500 My Ride: 800rwhp Turbo M3 View My Garage	Iphone fail __________________ Last edited by Commanderwiggin; 02-01-2013 at 06:08 PM.

02-09-2013, 07:48 PM	#697
being3 Registered User Join Date: Nov 2011 Location: British Columbia Posts: 461 My Ride: HPF 2.5 M3 Vert View My Garage	Took some cruising AFR video __________________ "Horsepower is how fast you hit the wall. Torque is how far you go through it."

02-10-2013, 12:01 PM	#698
being3 Registered User Join Date: Nov 2011 Location: British Columbia Posts: 461 My Ride: HPF 2.5 M3 Vert View My Garage	Installed AEM serial guage and moved my AFR mirror setup to a more functional position. __________________ "Horsepower is how fast you hit the wall. Torque is how far you go through it."

02-10-2013, 12:49 PM	#699
Commanderwiggin Registered User Join Date: Jun 2010 Location: Calgary, Canada Posts: 3,500 My Ride: 800rwhp Turbo M3 View My Garage	Good stuff! __________________

02-10-2013, 02:25 PM	#700
being3 Registered User Join Date: Nov 2011 Location: British Columbia Posts: 461 My Ride: HPF 2.5 M3 Vert View My Garage	More video on the AEM serial gauge setup __________________ "Horsepower is how fast you hit the wall. Torque is how far you go through it."

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