Rich condition

Discussion in 'Mazdaspeed 3 Troubleshooting' started by DotBoi, Jul 23, 2020.

Watchers:
5 users.
  1. DotBoi

    DotBoi Greenie N00B Member

    Joined:
    Mar 28, 2020
    Posts:
    5
    Trophy Points:
    3
    Location:
    Utah, United states
    Ratings:
    +1 / -0
    My 2007 Mazdaspeed3 has been running very rich. You can drive it but I avoid to right now as it will stall at idle sometimes. My AFRs at Idle will be in the 9-12 range most of the time. Cruising is alright, except when you let off the throttle, fuel continues to enter the engine creating pops and bangs.

    Mods to the car: Catback exhaust, HPFP internals, Unbranded Short ram Intake, Sure turbo inlet pipe, Aftermarket DV, Front mounted inter cooler, regular oil changes every 3k miles. 120K miles on the car.

    Codes from the ECU:
    P0300 Random/Multiple misfire,
    P2006 Intake Manf Runner control stuck closed bank 1a,
    P2178 System Too rich off idle bank1,
    P2188 System roo rich at idle bank1.

    The car has been running solid on a Stage 1 OTS tune for about a month, I created my own MAF calibration profile for my intake which ended up working very well for the past months.
    A few nights ago driving around normally, rolled up to a stoplight and the car stalled and it has been running rich since.

    A few things I've tried, cleaning the MAF, cleaning the O2 Sensors, cleaning the throttle body, re-calibrating the MAF multiple times, checked for vacuum leaks, DIY boost leak tested, and no leaks or drips anywhere that I can see. I thought maybe it would be the fuel relief valve, I noticed the Actual fuel pressure and the Desired pressure are very apart in the logs, what do you guys think it could be?
    I have some Accessport logs which you can view here: https://drive.google.com/drive/folders/1vxSqElc74YZPSKeShGUbSS9QF1Wm8iky?usp=sharing
     
  2. _kaaaaal_

    _kaaaaal_ Greenie N00B Member

    Joined:
    Aug 9, 2020
    Posts:
    3
    Trophy Points:
    1
    Location:
    UT
    Ratings:
    +0 / -0
    hey man you ever find out what was wrong? i’m getting a p2188 but my cars actually running lean for some reason but i can’t figure out why
     
    _kaaaaal_, via an iPhone, Aug 10, 2020
    #2
  3. DotBoi

    DotBoi Greenie N00B Member

    Joined:
    Mar 28, 2020
    Posts:
    5
    Trophy Points:
    3
    Location:
    Utah, United states
    Ratings:
    +1 / -0
    Not yet,
    More updates on what I have done.
    Replaced Both o2 sensors
    Vacuum tested Purge valve, holds vacuum just fine
    Replaced the MAP and MAF sensor
    Cleaned HPFP internals and fuel lines
    Cleaned out the EGR and EGR lines
    Pulled the intake mani, cleaned it out.
    Cleaned and Walnut blasted the intake valves,
    Got my fuel injectors tested at a local shop, no leaks, spay is ok. Within spec.
    Added corksport injector seals.
    Replaced PVC valve and added a catch can in the loop.
    Changed oil and filter.
    Changed spark plug and coils
    Compression test, all within spec.
    Checked VVT, timing chain is nice and tight.
    Tried factory air box + intercooler + BPV + stock tune
    Checked wiring harness for any frayed wires. Probed with a multi meter for bad grounds or shorting.

    All of this and nothing. Spooky huh?
    When I try to calibrate the MAF, I will get it running ok that night and come back to it the next day and all the sudden my fuel trims are pegged at -25 or +25 sometimes.
    One thing I did notice is there is a VERY long rev hang when you stomp the gas pedal for a second.
    After I cleaned the intake valves, the car does seem noticeably smoother but the AFRs are still whack.
    No new codes from the ECU at all.
    If I ever do find the cause of all of this I will update the thread. I really wonder if my ECU is just not having it.
     
    Last edited: Aug 18, 2020
  4. The_big_dill

    The_big_dill Greenie Member

    Joined:
    Jun 11, 2020
    Posts:
    90
    Trophy Points:
    18
    Location:
    Aurora, ON. Canada
    Ratings:
    +27 / -4
    Seeing as he only has 2 posts from half a year ago, i suspect he has
    I think the lack of reply on your original post says that you did a thorough job diagnosing it from what we can help. I guess throwing parts at it didn't help either :\

    This sounds like an intermittent issue: These are the worst to diagnose.

    The fuel trims you are seeing is just the ECU trying to compensate for unusual conditions. I do see certain inconsistancies in your logs regarding MAF V and flow (g/s). But this isn't conclusive since I don't know what your MAF cal table looks like.

    I noticed that in your diagnostics of the MAF, you did not do much more than clean the MAF sensor. This sensor is critical for good closed loop operation. If you don't have another sensor to replace, try unplugging it all together and see how your car runs at idle. (watch your AFRs).

    Following that, check wiring. When you checked the wiring harness, which areas did you check? I have heard of people having issues with the MAF wiring. I would peel pack the corrugated tubing and inspect the wires thoroughly.
     
  5. Woodzms3

    Woodzms3 Greenie N00B Member

    Joined:
    Aug 25, 2020
    Posts:
    7
    Trophy Points:
    3
    Location:
    Riverside,Ca
    Ratings:
    +1 / -0
    Did you ever find the problem ? Im having similar issues
     
    Woodzms3, via an iPhone, Oct 1, 2020
    #5
  6. DotBoi

    DotBoi Greenie N00B Member

    Joined:
    Mar 28, 2020
    Posts:
    5
    Trophy Points:
    3
    Location:
    Utah, United states
    Ratings:
    +1 / -0
    Here it is, after months of searching. I found the issue and fixed it, It turned out to be the Turbo.
    After months of trying some parts, and reading on the internet. One day when I ran the car to pull it in the garage, I started to see the legendary plumes of smoke coming from the tail pipe and the first thing that came to my mind was the turbo.
    Pulled the old K04 out, There was evidence of coolant and oil in the exhaust side of the housing, hell there was even some oil and coolant leaking out of the exhaust flange connections.

    Not a ton of shaft play on the turbo surprisingly, only just slightly more then a new one would have. I bought a brand new K04 and installed it after that. It took me about 40 hours of labor doing by myself for the first time with only hand tools.
    Interestingly, the old turbo 'seemed' fine before it started smoking. It would build boost just fine but idle and cruising the car would run like shit. My theory is that the bearings went first, causing the turbo compressor to have more resistance at lower RPMs and boost, which probably caused all of my inconsistent AFR issues. Months later after the main issue started, the turbo seals went and the smoking issue started.

    I have the new turbo in the car now and it runs like a dream, its on the same tune I had it on previously. It seems better then it was before the original issue came up since all of the other work that was done recently. A very interesting issue but I'm glad its all figured out now. Ran into so many people saying "Get a tune" on the forms and reddit but you cant tune a car that its not mechanically sound.
    Anyways, I hope this helps people who have the same issue in the future :)
     
    • Like Like x 1
  7. L337TurboZ

    L337TurboZ Silver Member

    Joined:
    Jun 15, 2020
    Posts:
    79
    Trophy Points:
    18
    Location:
    Charleston, South Carolina USA
    Ratings:
    +58 / -2
    Did the body of the turbo crack or just the seals went out that badly?
     
    L337TurboZ, via a mobile device, Oct 17, 2020 at 10:34 AM
    #7
  8. Woodzms3

    Woodzms3 Greenie N00B Member

    Joined:
    Aug 25, 2020
    Posts:
    7
    Trophy Points:
    3
    Location:
    Riverside,Ca
    Ratings:
    +1 / -0
    Makes sense, my problem is that i put my old oem catted down pipe (that has been sitting outside) back on for emissions im guessing it was really clogged with dirt and caused alot of back pressure possibly ruining my turbo. I haven’t solved my issue but my problems are exactly like your with my stft and ltft at -25 extremely rich a/f at around 9 or 8 i have changed and tested the sensors and done boost leak test and nothing car still runs like shit bogging out and stalling with loads of white smoke my turbo seems fine with no shaft play at 75 k but your reply is makes it me suspect the turbo more did you notice fuel in your oil?


    Sent from my iPhone using Tapatalk
     
    Woodzms3, via a mobile device, Oct 17, 2020 at 5:31 PM
    #8
  9. DotBoi

    DotBoi Greenie N00B Member

    Joined:
    Mar 28, 2020
    Posts:
    5
    Trophy Points:
    3
    Location:
    Utah, United states
    Ratings:
    +1 / -0
    @Woodzms3
    Just the turbo seals where bad and the bearing was questionable, the housings and blades looked fine on both sides. I did notice a ton of fuel getting in my oil and oil catch can going though the PCV valve. I changed the oil and filter 3 times during troubleshooting. I ran the car for maybe 15 minutes on fresh oil change and then it reeked of fuel afterwards. If you are seeing lots of white smoke, I suspect its the turbo seals they often tend to put out lots of smoke when the fail. If you can get a leak down test + compression test done that would be good to check to make sure the block and head are sound, white smoke could indicate a blown head gasket sometimes worse, but its not as common on these cars compared to others.
     
Loading...

Share This Page

Users Viewing Thread (Users: 0, Guests: 0)