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  1. #41
    Senior Member Four Rings Okedokey's Avatar
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    Oil and Cam Follower Change = Cylinder 4 misfire?

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  2. #42
    Veteran Member Four Rings
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    Great info, thank you!

  3. #43
    Senior Member Four Rings Okedokey's Avatar
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    Oil and Cam Follower Change = Cylinder 4 misfire?

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  4. #44
    Veteran Member Four Rings
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    Strangely a new CEL popped up yesterday for P0171. Most posts say this is a vacuum leak but with the recent issues I've experienced I'm not sure what to make of it. I'm replacing the fuel filter since I haven't changed it in a long time but I'm not sure what else to check.

  5. #45
    Veteran Member Four Rings mtroxel's Avatar
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    Quote Originally Posted by wootwoot View Post
    Strangely a new CEL popped up yesterday for P0171. Most posts say this is a vacuum leak

    It IS system too lean. That is usually caused by a vacuum leak. You motor is seeing more air than the MAF measured. Could be MAF, could also be some accidental damage caused by the cam follower work. Is it connected to your misfire? Who knows. But I'd troubleshoot that air leak. See RossTech here, but note that we don't have secondary air on the 2.0T:

    http://wiki.ross-tech.com/wiki/index...5/P0171/000369
    11 A4 Q, Prestge, Black
    95,000 miles, APR Stage 1

  6. #46
    Veteran Member Four Rings 80sGuy's Avatar
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    Quote Originally Posted by wootwoot View Post
    Strangely a new CEL popped up yesterday for P0171. Most posts say this is a vacuum leak but with the recent issues I've experienced I'm not sure what to make of it. I'm replacing the fuel filter since I haven't changed it in a long time but I'm not sure what else to check.
    It is one of the contributing factors but not necessary the main cause. When I had that code two years ago I discovered the airbox wasn't tightly sealed, when it did that was the remedy. Carefully check around the area for possible linkage to the cause.

    2008 A4 2.0T | Dolphin Gray Metallic/Dk Gray | multitronic | Bluetooth | Dk Wood | Convenience. | Premium. | Sprt Susp. | Bare-bone 100% factory stock!

  7. #47
    Established Member Three Rings B7S3wannabi's Avatar
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    Quote Originally Posted by wootwoot View Post
    Strangely a new CEL popped up yesterday for P0171. Most posts say this is a vacuum leak but with the recent issues I've experienced I'm not sure what to make of it. I'm replacing the fuel filter since I haven't changed it in a long time but I'm not sure what else to check.
    P0171 could be a number of things. Intake should be smoked as a first step to check for any leaks. A faulty PCV valve or N80 valve could also cause this code.
    Check over everything you have just recently worked on including the seal on the intake temperature sensor you removed to seafoam the intake to make sure it's not damaged.

  8. #48
    Established Member Three Rings StatusQuo's Avatar
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    Check your tank fuel pump duty cycle at idle. Over 60% is a red flag. Check to see if it's meeting requested fuel pressure at idle and light driving.

    Also check your o2 corrections.

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  9. #49
    Veteran Member Four Rings
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    Quote Originally Posted by 80sGuy View Post
    It is one of the contributing factors but not necessary the main cause. When I had that code two years ago I discovered the airbox wasn't tightly sealed, when it did that was the remedy. Carefully check around the area for possible linkage to the cause.
    I'll check around for any possible leaks. Strangely the CEL disappeared on it's own today.

  10. #50
    Veteran Member Four Rings
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    Quote Originally Posted by B7S3wannabi View Post
    P0171 could be a number of things. Intake should be smoked as a first step to check for any leaks. A faulty PCV valve or N80 valve could also cause this code.
    Check over everything you have just recently worked on including the seal on the intake temperature sensor you removed to seafoam the intake to make sure it's not damaged.
    That's a good point about the IAT sensor, it's something I'll check. I have a catch can setup which I checked already and it's on tight so I doubt the issue is there. N80 I'll keep in mind and might change just to rule it out.

  11. #51
    Veteran Member Four Rings
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    Quote Originally Posted by StatusQuo View Post
    Check your tank fuel pump duty cycle at idle. Over 60% is a red flag. Check to see if it's meeting requested fuel pressure at idle and light driving.

    Also check your o2 corrections.

    Sent from my ONEPLUS A5000 using Audizine mobile app
    That's good info StatusQuo but I'm only using the torque app and don't think it will pull that data like vagcom will. I'm wondering if there could be an issue with the fuel pump. For the past year or so whenever I fill the tank the car smells like gasoline until I've used about 1/4 of a tank and sometimes when WOT I experience what feels like temporary fuel cuts that drops the boost level for a fraction of a second before boost shoots back up.

  12. #52
    Established Member Three Rings StatusQuo's Avatar
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    Hmm yeah man, vacomm is deff a good investment. If you don't wanna shell out that kind of money, there are some cheaper alternatives. OBDeleven, Carista and others come to mind. They all are good for logging issues and such.

    Torque app is good. I use it. But it's many just good for the gauges

    Now the WOT issues you are saying is exactly what I was having. Turned out to be my intank fuel pump. Also could be an issue with the HPFP. Unfortunately, nothing you will be able to really diagnose unless you have a specialized VW scan tool.

    I would get one. (hell even the cheap ones). They pay for themselves in saving headache. Much better than having to undergo a serious job just to find out that's not the issue.


    Also the gas smell could be related to the N80 valve. Easy replacement.

    Hell, that can be your issue right there. Bad N80 can cause system lean faults.


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  13. #53
    Senior Member Four Rings Okedokey's Avatar
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    Quote Originally Posted by wootwoot View Post
    That's good info StatusQuo but I'm only using the torque app and don't think it will pull that data like vagcom will. I'm wondering if there could be an issue with the fuel pump. For the past year or so whenever I fill the tank the car smells like gasoline until I've used about 1/4 of a tank and sometimes when WOT I experience what feels like temporary fuel cuts that drops the boost level for a fraction of a second before boost shoots back up.
    Check you've sealed the in tank pump correctly. The only time mine did that was when the gasket between the pump and the tank wasn't installed correctly.
    A4 B7 2.0T | HPFP upgrade + FMIC | BSR Stage II + exhaust + HFC | 3.0TFSI Throt. Body | RS4 fuel contr., PRV + S3 inj., G247 + DW300c | GFB DV+| 034 RSB + all arms and mounts | S4 brakes | B12 Bilstein suspension + H&R springs | RNS-E + Polk Audio PA D5000.5 - 4 x DB6502 + DB840DVC sub + Pioneer 10" sub | LEDs throughout | 19" Audi 2015 RS4 rims

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  14. #54
    Veteran Member Four Rings
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    Quote Originally Posted by StatusQuo View Post
    Hmm yeah man, vacomm is deff a good investment. If you don't wanna shell out that kind of money, there are some cheaper alternatives. OBDeleven, Carista and others come to mind. They all are good for logging issues and such.

    Torque app is good. I use it. But it's many just good for the gauges

    Now the WOT issues you are saying is exactly what I was having. Turned out to be my intank fuel pump. Also could be an issue with the HPFP. Unfortunately, nothing you will be able to really diagnose unless you have a specialized VW scan tool.

    I would get one. (hell even the cheap ones). They pay for themselves in saving headache. Much better than having to undergo a serious job just to find out that's not the issue.


    Also the gas smell could be related to the N80 valve. Easy replacement.

    Hell, that can be your issue right there. Bad N80 can cause system lean faults.


    Sent from my ONEPLUS A5000 using Audizine mobile app
    That's good info, I always wanted a vagcomm but at $300 it was too expensive. I just purchased OBDeleven, it looks like it should do most of what I need. I'll run more tests once I have it.

    - - - Updated - - -

    Quote Originally Posted by Okedokey View Post
    Check you've sealed the in tank pump correctly. The only time mine did that was when the gasket between the pump and the tank wasn't installed correctly.
    Okedokey I haven't replaced the in tank pump yet. I just ordered OBDeleven to help run some tests on the car and may be replacing the pump soon.

  15. #55
    Established Member Three Rings StatusQuo's Avatar
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    Let us know how it goes!

    Sent from my ONEPLUS A5000 using Audizine mobile app
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  16. #56
    Veteran Member Four Rings
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    I scanned with OBDeleven and pulled a P2177 - System too lean off idle, bank 1 Upper limit exceeded intermittent. I checked the take fuel pump duty cycle and was sitting at 57% at idle. Now that I have a VAG-like tool I'm definitely up for more logging. This weekend I'll get the fuel filter changed out. I didn't originally realize but the N80 valve had been replaced a long time ago and I'm not sure how failure prone they are so I'm holding off on replacing it for now. If there are any other tests you can think of doing please let me know.
    Last edited by wootwoot; 08-24-2017 at 10:48 PM.

  17. #57
    Veteran Member Four Rings
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    Scratch that, N80 valves are damn cheap so I put in an order and will swap it out.

  18. #58
    Veteran Member Four Rings
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    I hate not seeing follow through on threads like these so I wanted to post my most recent experiences. Shortly after my last post I replaced the N80 valve, then the MAF sensor. The car drives a little better now and doesn't bring up a CEL but I am still only getting 15mpg in 95% city driving. The codes below come up when I scan the car and the next step is likely dropping it off at the local performance shop for further diagnosis.

    P0300 - Random/Multiple Cylinder Misfire Detected Implausible signal
    Intermittent
    P0304 - Cyl.4 Misfire Detected Implausible signal
    Intermittent
    P2177 - System too lean off idle, Bank 1 Upper limit exceeded
    static

  19. #59
    Veteran Member Four Rings mtroxel's Avatar
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    So with a new MAF your car is still too lean. It's getting post-MAF air. Probably a vacuum leak.
    11 A4 Q, Prestge, Black
    95,000 miles, APR Stage 1

  20. #60
    Established Member Three Rings
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    OP, what did the old plug 4 look like opposed to the other three? Wet, dry, carbon buildup, ashy ...

    Any oil consumption history?

    See if they can do a compression check on that cylinder.

  21. #61
    Veteran Member Four Rings
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    I wanted to provide an update in case this happens to anyone else. The car just got back from the shop and the issue was diagnosed as a failed turbocharger boost solenoid valve. This has been replaced and so far so good.

  22. #62
    Established Member Three Rings
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    is that the n75 valve you are referring to?
    Quote Originally Posted by wootwoot View Post
    I wanted to provide an update in case this happens to anyone else. The car just got back from the shop and the issue was diagnosed as a failed turbocharger boost solenoid valve. This has been replaced and so far so good.

  23. #63
    Established Member Three Rings
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    turbocharger boost solenoid valve, is that able to make fuel too lean?

  24. #64
    Established Member Three Rings
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    by the way does the evap system have anything to do with some kinda of leak pref oil as in my case because it looks like the hose is going thru tourture right now in my car?

  25. #65
    Veteran Member Four Rings
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    Quote Originally Posted by ahotboy15 View Post
    is that the n75 valve you are referring to?
    Yes it is

  26. #66
    Veteran Member Four Rings
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    The final update is that fixing the N75 didn't work. The lean code returned and my car continued to get horrible gas mileage. Took it back to the shop and they found that fluid from an aftermarket air filter had leaked onto my MAF. Full MAF replacement and 100 miles and the code hasn't returned. The car is driving much better in all RPM ranges and feels good again. The air filter I had was a drop in K&N with the factory spray on it.

  27. #67
    Established Member Three Rings
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    Nice update. How much was a new Maf cost you?

  28. #68
    Veteran Member Four Rings mtroxel's Avatar
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    Thanks for the update. Chalk up another one for the idea that those air filter kits are a complete waste of money.
    11 A4 Q, Prestge, Black
    95,000 miles, APR Stage 1

  29. #69
    Veteran Member Four Rings 80sGuy's Avatar
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    Quote Originally Posted by ahotboy15 View Post
    Nice update. How much was a new Maf cost you?
    The sensor and housing shouldn't cost too much.
    https://www.europaparts.com/mass-air...06d906461.html

    2008 A4 2.0T | Dolphin Gray Metallic/Dk Gray | multitronic | Bluetooth | Dk Wood | Convenience. | Premium. | Sprt Susp. | Bare-bone 100% factory stock!

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