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  1. #41
    Veteran Member Three Rings
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    Quote Originally Posted by 5ktq View Post
    That (mult) bit means the problem is when you are on the throttle, it's ok (or not as bad) at idle.

    Need to check MAF, fuel pressure under load. Have you replaced fuel filter ever, maybe bad injector, etc
    Nice that's good to know, my maf is either still my stock one or one that I grabbed from the wreckers a while back but I forget. I changed the fuel filter 2 or 3 years ago and the fuel pump was changed about 6 months after that. I'll take some readings of the fuel pressure under load and report back, what would be the best and most accurate way for me to perform this? Third gear pull? I'll be cleaning my injectors over the weekend to make sure they're clean.

    Thanks for your input and help!

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  2. #42
    Veteran Member Three Rings
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    Update,

    Sorry for the wait, just been busy with projects. So I got to install my fuel pressure gauge with an extension of fuel line to have the gauge into my car. I tee'd off the fuel supply line before the rail and ran a 5 feet line of fuel line with the gauge attached at the end.

    My pressure does not go above 58psi, in any gear and up to redline, it just sticks to 58 psi. This would be the cause to my high LTFT's I would imagine... What should I do next? Change fuel filter first? Both filter and pump are new within 3 years though...

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  3. #43
    Veteran Member Four Rings old guy's Avatar
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    Dec 28 2006
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    My Garage
    2003 A4, 2009 CC VR6 Sport, 2013 A5 B8
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    Your fuel pressure is perfect. That is exactly where it should be for a return-less system. Fueling is controlled by the injector duty cycle, not the pressure.
    A4 Motoza tuned Frankenturbo F21L mixed flow turbo / Bosch 550's / 3" MAF / TyrolSport SMIC / FT High Flow Exhaust Manifold / 034 HFC / TT 2.5" DP / Borla Exhaust / Eibach ProKit Springs / Koni Yellows / H-Sport Sway Bars / TyrolSport Brake Stiffeners / HyperShift Short Shifter / Podi Boost Gauge
    A5 Mods to come: Little stuff so far. 20/25mm spacers / H&R OE Sport springs / 35% tint

  4. #44
    Veteran Member Three Rings
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    Quote Originally Posted by old guy View Post
    Your fuel pressure is perfect. That is exactly where it should be for a return-less system. Fueling is controlled by the injector duty cycle, not the pressure.
    Oh.... I thought the pressure was supposed to rise as boost hits. So this would only be on a return system?

    Damn I thought I had finally figured out my issue lol

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    Last edited by K04-B6; 07-28-2017 at 08:10 PM.

  5. #45
    Veteran Member Three Rings
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    Another update,

    When I did a smoke test in my exhaust I didn't think that it had built enough pressure/smoke to make it to the front of the car. So today I picked up a bottle of Seafoam, I added a little Seafoam through the intake at idle and watched the smoke appear through the back of the car. I made my way to the exhaust area and I could see a little bit of smoke coming out at my manifold to turbo flange. With the smoke I could see a little bit of humidity building where the leak was coming from. This is most likely my issue. I will be changing my manifold gasket at the same time. What a would be the best way to do this? From what I can see the bolts are fairly accessible without removing the turbo.

    Any tips to make sure I get a good seal would be appreciated.

    Thanks guys, I'll keep this updated.
    Last edited by K04-B6; 07-31-2017 at 05:48 PM.

  6. #46
    Veteran Member Four Rings walky_talky20's Avatar
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    Jun 30 2008
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    30427
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    Erie, Pennsylvania

    1.8t rear 02 sensor LTFT readings, 02S/CAT readiness and spacing

    I really don't think a tiny manifold leak is your issue. If the leak is large enough that you're embarrassed to start your car with friends around, then maybe.

    Can you provide a MAF log? I think that would be beneficial.


    Sent from my iPhone using Tapatalk
    ^Don't listen to this guy, he's not even a mechanic.
    2001 Laser Red A4 1.8TQM, 5-Speed Swapped, 4.11 Final Drive, APR 93, R8 coil packs, Labree HFC & DP, 2.5" Exhaust, ST Coilovers, 034 RSB, A8 Brakes Front & Rear, 18" RS4 Reps
    2006 Passion Red Volvo V50 T5 AWD 6MT
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  7. #47
    Veteran Member Three Rings
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    Quote Originally Posted by walky_talky20 View Post
    I really don't think a tiny manifold leak is your issue. If the leak is large enough that you're embarrassed to start your car with friends around, then maybe.

    Can you provide a MAF log? I think that would be beneficial.


    Sent from my iPhone using Tapatalk
    I think that it is my issue, since the leak is before the primary 02 it throws off my readings and therefor cannot set readiness for 02S. My LTFT's happen as I'm driving and increase at higher speeds/rpm's which would make sense since more exhaust is escaping.

    My MAF readings are within spec. at idle/full temp it sits at 2.50-2.75 g's and third gear pull from 2500 to redline my readings are at 191 g's.
    I've also done numerous boost leak tests/smoke tests and I know I have no leaks in my system and all my vacuum hoses/lines and fittings are all new within the last year.

    I ordered a new manifold gasket and the gasket that sits in-between the manifold and turbo. Once installed I will know if this fixes my issue by checking my LTFT's.

    I'll post an update
    Last edited by K04-B6; 08-02-2017 at 07:22 AM.

  8. #48
    Veteran Member Four Rings MikTip's Avatar
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    Dec 25 2004
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    Earth
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    Does your tune have the rear? 02 sensor delete file? How old are your 02 sensors?
    K04-15/APR/TT 225 Injectors/TFSI Coils/Custom Stainless Exhaust/710N/RaceTec FMIC/ 034 HFC/Jet-Hot Cermi-coated & ported exhaust manifold/JHM B7RS4 SMFW clutch/Neuspeed TIP/Apikol Snub/Optima 75-35/AFE Pro-Dry/AMS Short-shift @ %40 redux
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  9. #49
    Veteran Member Three Rings
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    Quote Originally Posted by MikTip View Post
    Does your tune have the rear? 02 sensor delete file? How old are your 02 sensors?
    I'm not sure if my tune has the rear 02 delete file but I've seen it pass readiness before for both CAT and 02S, both 02 sensors are roughly a year old. The reason I'm don't know what my tune exactly entitles is because the previous owner did not give me any of his APR invoices for the tune and if I want any information on it I'd have to pay 200$ to have it transferred to my name and then drive down to MTL to have them scan the tune to see what I have. I've asked them if they would have my file with a VIN look-up and they said they didn't do that back then...

  10. #50
    Veteran Member Three Rings
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    I took my exhaust manifold off tonight and you can see where exhaust was leaking from the flange. I cleaned all surfaces and installed new gaskets. I will know tomorrow if this helps at all.



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  11. #51
    Veteran Member Three Rings
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    Quote Originally Posted by walky_talky20 View Post
    I really don't think a tiny manifold leak is your issue. If the leak is large enough that you're embarrassed to start your car with friends around, then maybe.

    Can you provide a MAF log? I think that would be beneficial.


    Sent from my iPhone using Tapatalk
    Well Walky, you were right... That didn't fix my issue! It didn't even help bring the LTFT's down at all. I was sure this would of been the issue since there was an actual leak before the primary 02.. Now I'm really fucking confused with what it could be. Fuel pressure is within spec at idle and at WOT, MAF readings are within spec, No vacuum leaks or boost leaks in my system, Exhaust leak fixed...



    Only thing left would be to clean my injectors, I doubt that's my issue as well. I also have a spare MAF at home from the wreck yard that I pulled last weekend but again I'm within spec with the one I have installed. I'm really at a loss here.
    Last edited by K04-B6; 08-03-2017 at 08:27 AM.

  12. #52
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    Came back home tonight and did another "smoke test" with seafoam and again smoke came from where the manifold meets the turbo... It's not sealing very well there and I don't know why.. If this isn't enough to cause my LTFT's to be so high ill leave it alone for now.

    I've replaced my maf with one I have laying around here so I'll know if it changes anything on my way to softball but I doubt it since I had it idling and the readings were the same as the old maf..

    Keep you guys updated

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  13. #53
    Veteran Member Three Rings
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    On my way to softball I took the same way I take to go to work (parkway) this is where I cruise at 70kms for a good 15 minutes. My LTFT's were bouncing in between 9.4 and 10.9 at that moment with the spare MAF I installed. I thought to myself: well that's an improvement.

    After softball I decided to hit the highway to really test it out, so I boosted and made my way to roughly 130kms and then dropped to 120 and hit cruise. My LTFT's went all the way up to 22.5 and then slowly came back down to 14.1 and stayed there till I got home, it went to 14.8 for a few seconds as well.. So this is what I got when I got home and idled. It bounced in between 0 and - 5.5 for stft... Since I'm still having that small leak at the manifold to turbo flange, would this cause these types of readings? I think the flange on my manifold isn't flush.. Any tips to have it seal good?

    20170803_215356.jpg



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  14. #54
    Veteran Member Three Rings
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    I'm still chasing this issue down. Since my last post I have discovered a tear in my vacuum line running from the PCV valve to the SJP, I have replaced both the PCV valve and line. I took the gasket that was sitting in-between the exhaust manifold and turbo out. I read in previous posts that the gasket may cause more of a leak than without it.

    Morning drive into work.... On my way to work this morning, again cruising at 70-80 km's an hour, my LTFT's went down to +12.5 and raised to +14.8 by the time I got to my parking spot at work. Tonight on my way home I will be taking the parkway and then hopping on the highway for about 5 minutes. My speculations are that my LTFT's will rise to roughly +18 - +20.3 as this is what happens on most days..

    I'm really stumped on what this issue could be. I have posted the car up for sell, so if it sells I'll let it go. I just do not have the time and money to put into an issue that doesn't seem to get resolved. If the car doesn't sell I'll just have to drive it until I need an emission test (which is most likely September 2018) and then I'll really be stuck because it'll definitely not pass with readiness not setting.
    Last edited by K04-B6; 08-10-2017 at 07:43 AM.

  15. #55
    Veteran Member Three Rings
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    So I decided to take a reading on my drive from softball since I'm on the highway for a longer period of time. I've taken 3 shots at different speeds to show what readings. I've also realized that my speedometer is off by roughly 8 km's an hour according to the scanner.

    The first pic is stating I'm traveling at 112kms an hour but my speedometer says I'm going 120.

    In the second pic I decided to cruise at 130kms an hour (120 according to the scanner) and my LTFT's started to head downwards.


    And by the time u got home in the driveway, I finished off with a lower reading again at idle.


    When I got home from work I decided to erase the code that I had stored in my ecu, I erased it with my free software of vcds lite. My regular obd2 scanner did not pick this code up. I also had no check engine light. So my drive to and from softball consists of 30 mins each way. My readings are from the last 30 minutes drive.

    I'm just really confused at what could be wrong. After installing the new pcv valve and vacuum hose I ran a boost leak test and did not hear anymore leaks. The only leak that I would have would be at the manifold to turbo flange... But apparently I wouldn't have these types of readings with just that leak?

    Thanks guys

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    Last edited by K04-B6; 08-11-2017 at 06:57 AM.

  16. #56
    Senior Member Two Rings Gin+'s Avatar
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    CNY Syracuse

    What was the code you erased? What is your maf reading at idle, warmed up, ac off, etc...? Do the trims zero out when you reset dtc's? I'd get another ecu with a stock set of injectors before you drive yourself totally mad:)
    They're not scared of you. They're scared of what you represent to 'em.

  17. #57
    Veteran Member Three Rings
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    Quote Originally Posted by Gin+ View Post
    What was the code you erased? What is your maf reading at idle, warmed up, ac off, etc...? Do the trims zero out when you reset dtc's? I'd get another ecu with a stock set of injectors before you drive yourself totally mad:)
    It was the same code as before, the lean trim. Well my tranny decided to take a shit so I decided that I'll part the car. I'll be posting parts up soon

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