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  1. #1
    Established Member Two Rings Xmenpl's Avatar
    Join Date
    Nov 25 2009
    AZ Member #
    51221
    Location
    Long Island

    Apr 1+ Boost Issues

    Car is stock except APR programming, TT225 injectors, and 007 DV w/ yellow spring, Tiptronic.
    Im getting:
    P1127 Long Term Fuel Trim mult.,Bank1 System too Rich - Check Engine Light

    Ive attempted boost leak and found rip on the TIP so i replaced it with Forge TIP. As I was installing new inlet pipe I managed to break N75, so I had that replaced.
    Another boost leak test revealed faulty suction jet pump, replaced that as well.
    I have cleaned throttle body and MAF.
    3 way check valve was replaced.
    PCV w/ check valve assembly was replaced.

    After doing all of the above I still get the same code.

    UPDATE:
    I've confirmed with APR, they burnt the WRONG PROGRAM. I spend 4 hours having it flashed at H2o. On my invoice it clearly says Stage 1+.
    Temporarily I'm running oem injectors until apr schedules to have my ecu reflashed, no code and trims stay at -0.8/-0.9 (idle/partial).
    Last edited by Xmenpl; 11-05-2010 at 06:58 AM.

  2. #2
    Established Member Two Rings Xmenpl's Avatar
    Join Date
    Nov 25 2009
    AZ Member #
    51221
    Location
    Long Island

    Does this look alright, when MAF drops while throttle is WOT?


    Trim values in group 032, drop from -5 to -25 (max limit) due to rich condition. Im trying to find out it this is due to boost leak, maf, or something else.

  3. #3
    Veteran Member Four Rings MikeWire's Avatar
    Join Date
    Mar 08 2007
    AZ Member #
    16229
    My Garage
    Air and water
    Location
    SATX

    Too much air coming to into the intake - you may want to look at your SAI pump and the hoses for any breakage or splits. You may be getting excess air in through that system.
    -Mike
    @countdowngarage

    2015 Porsche Macan S | 2021 Atlas SEL-P | 1972 VW Bus | 1965 VW Beetle

    SOLD - 2017 VW GTI APR Stage 2
    SOLD - 2001 Allroad - 6 speed swap thread
    SOLD - 2003 A4 1.8TQM Avant Atlas - 5 speed swap thread

  4. #4
    Established Member Two Rings Xmenpl's Avatar
    Join Date
    Nov 25 2009
    AZ Member #
    51221
    Location
    Long Island

    Ive attempted to do boost leak test once more after rechecking vacuum connections and cleaning throttle body.
    After I set the compressor to pressurize the system I wasnt able to build any pressure. Air was rushing out of valve cover. The normal air bubbling was almost unnoticeable. Which route would air have to bypass to directly exit by rear of valve cover?

  5. #5
    Veteran Member Four Rings old guy's Avatar
    Join Date
    Dec 28 2006
    AZ Member #
    14483
    My Garage
    '13 A5, '24 Tiguan SEL R-Line
    Location
    Western Maryland

    I assume you disconnected the PRV before you started. A defective crankcase breather valve will allow boost pressure to enter the block.
    '03 A4 5-MT Motoza tuned Frankenturbo F21L With full supporting mods. Sold (and missed dearly).
    '13 A5 6-MT Needs more Fun Stuff: Neuspeed PM / 3.0 TDI Intercooler / H&R OE Sport Springs / Bilstein B8 Shocks / TyrolSport Brake Stiffeners / ECS Short Shifter / S5 Side Skirts / RS Grille

  6. #6
    Established Member Two Rings Xmenpl's Avatar
    Join Date
    Nov 25 2009
    AZ Member #
    51221
    Location
    Long Island

    Yes, I had pressure regulating valve off and TIP side was plugged.

    I should have checked that valve when i was replacing breather tubing month ago. Ill buy the valve and see what happens.

  7. #7
    Established Member Two Rings Xmenpl's Avatar
    Join Date
    Nov 25 2009
    AZ Member #
    51221
    Location
    Long Island

    Replaced breather valve, sometimes called PCV valve. The valve was letting air out both ways. Mine was built in into T with the check valve on the side, http://www.ecstuning.com/Audi-B6_A4-..._Balve/ES7940/
    After swapping it I finally regained idle. Car idles at 800, how it supposed to.
    I am not getting code P0507 Idle Air Control System RPM Higher Than Expected, so I know it was directly affected by it.

    I am still getting only 14inHg on cold idle, 16-18 when hot.
    My 'idle' adaptation on the block 032 drops to -9, and 'partial' falls on its face below -25.
    Every time I go out driving the car I reset the adaptation and monitor the values.
    I found the behavior isnt consistent. I can drive on the highway and city for half our and not get a single drop on 'partial' value. And other times it will drop to -25 within few seconds.
    My next step is to test every check valve. I believe one valve doesnt seal going from vacuum to boost and in reverse letting air out.

  8. #8
    Established Member Two Rings Xmenpl's Avatar
    Join Date
    Nov 25 2009
    AZ Member #
    51221
    Location
    Long Island

    Was inspecting check valves today, all inline valves tested okay except 3-way valve above suction jet. Is it supposed to hold pressure? Mine is slightly leaking
    The reason Im asking since there is another check valve right behind it, coming off a smaller nipple.

  9. #9
    Established Member Two Rings Xmenpl's Avatar
    Join Date
    Nov 25 2009
    AZ Member #
    51221
    Location
    Long Island

    After ruling out the defective hardware and boost leak I contacted APR to confirm what stage they flashed my car with.
    They have confirmed it was the wrong stage, what they put was Stage 1 instead.

    I gave them benefit of the doubt at the beginning which cost me hours of troubleshooting and replacing parts. I should have asked them then.

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