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BMW 3-Series (E90 E92) Forum
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11-11-2014, 07:04 PM | #1 |
Lord Scrip
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What does the error code 2AAF mean?
1-if you say fuel pump plausabity, I'll shoot you! 2-if you say it's common in stock and tuned 335's, I'll shoot you! 3-if you say it won't trigger a CEL and I should ignore it, ILL KILL YOU!!!! What SPECIFICALLY is wrong? My Whatsapp says "fuel valve throttle spring....". What is the deal and what is messed up? Is this a case of the wires corroding at the wire harness connect and its a momentary disconnection issue?
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11-11-2014, 07:08 PM | #2 |
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I would like to help you but im scared that you will not like my answer and shoot me
2AAF means that the car is not getting enough fuel. A code tells you the end result, not the reason why this is happening. It could be a million thing ( 3 of these things you already mentioned), but it will be very hard to figure it out without a datalog or going to a mechanic
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11-11-2014, 07:10 PM | #3 | |
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11-11-2014, 07:23 PM | #4 |
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I had that exact same error, and I found it was due to my fuel pumps plausabity.
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11-11-2014, 07:24 PM | #5 | |
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11-11-2014, 07:30 PM | #7 | |
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11-11-2014, 08:08 PM | #8 |
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It's my (admittedly limited) understanding from the data given during the code, that it occurs when fuel demand is outside the parameters that the ECU was programmed to accept as "ok". This isn't uncommon on a tuned car because we use WAY more fuel at wide open throttle (especially with aggressive boost curves way down low) so the difference between actual and requested fuel pressure can sometimes be significant.
If that same pressure difference (between actual and requested) were to occur on an otherwise stock car, it would raise eyebrows and likely mean that your fuel pump was either broken or on the way out. Hence, "fuel pump plausibility". So to me it's more a transient condition fault that is less meaningful because we're operating so far out of the range of stock values.
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11-11-2014, 08:32 PM | #9 | |
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11-11-2014, 08:33 PM | #10 |
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Last question.....who makes a good upgraded pump?
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11-11-2014, 08:35 PM | #11 | |
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E90 - N54 2007 Alpine White FBO :
VRSF CP w/ Tial BOV,VRSF 7 inch FMIC, VRSF Catless DP's, Hexon RR600, Cobb V3, VMR V710 Gunmetal 19x8.5 and 19x9.5, SteveAZ stage 2 bucket |
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11-11-2014, 08:41 PM | #12 |
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FUEL-IT are the only ones worth getting. The Stg 2 bucket is good for FBO to maxed out hpfp. Once you go shotgun or port fueling you'll need a further upgrade.
@SteveAZ
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09 135I M (VK80379) 6MT. Race Project car. 1) Install Cobb/piggyback? and Motiv 600 Kit[HTA3076R w/ tial .82] 2) JRZ or Moton suspension. 3) Build high flow intake manifold with multi-port fuel and relocate OFH 4) Build full cage 5) Complete staged twin setup with HTA4205R [w/Tial 1.16] 6) Complete dry sump system |
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11-11-2014, 09:27 PM | #13 |
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I get this intermittently around 6000rpm, dci/tune only... afrs do not deviate and bmw sib states if this fault isnt accompanied with other fuel related faults its an over sensitive find and a non issue. That has been the case for me.
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11-11-2014, 10:29 PM | #14 |
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Please realize that any additional demand placed on the EKP (what runs the LPFP) is likely to cause a 2aaf error. It is a shadow code and does not cause an SES or half engine light but it is the DME warning you that your LPFP is operating outside it's factory tolerances. Consequently it thinks your pump is going bad.
Some people code this out but it is one of the nuances of requiring more fuel. If you are making more power and/or running ethanol and requiring adjustments to your scalars...you are running more fuel and you will likely get a 2aaf error.
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11-11-2014, 11:09 PM | #15 | |
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Btw your stage 2 was beyond my expectations. I feel like a wild animal that got released out of its cage gone wild.....lol |
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11-12-2014, 08:43 AM | #16 | |
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2007 335i e90 6mt | Motiv 750 XR8267 | RB PCV | JB4 G5 | MHD Pump Flash | Walbro 255lph | VRSF CP & Tial BOV | NGK Plugs | Custom Side Exhaust | CxRacing FMIC | Spec 2+ & SSMFW | StopTech Drilled/Slotted Rotors | Hawk Performance Pads | DEFIV Lockdown kit | Mtec V3 | Apex PS7s | 35/15% Llumar ceramic
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11-15-2014, 11:15 AM | #17 |
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2008 E88--Fuel-It! Stage 4 LPFP & PI--PS2 turbos--JB4/MHD--FBO--662whp/604wtq
2011 E90--Fuel-It! S2BL LPFP and PI--PS2 Turbo--JB4/MHD--FBO--546whp/589wtq 2013 Mini JCW--Tune--DP--FMIC--a couple Fuel-It! goodies--265whp/320wtq 2013 F10--JB4/BM3 2015 F82--Fuel-It! Stage 3 LPFP & PI--PS2 Turbos-- JB4/BM3-FBO |
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11-15-2014, 11:40 AM | #18 |
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Amazing! Thanks for that bud!
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11-15-2014, 12:54 PM | #19 |
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Fuel pump plausability, it's common in stock and tuned 335's, it won't trigger a CEL and you should ignore it.
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11-15-2014, 01:07 PM | #20 | |
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11-15-2014, 01:24 PM | #22 | |
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