Lightly modified MS6 bucking and extremely lean.

Discussion in 'Mazdaspeed 6 Troubleshooting' started by Rustyms3, Aug 2, 2021.

Watchers:
3 users.
  1. Rustyms3

    Rustyms3 Greenie Member

    Joined:
    Nov 8, 2020
    Posts:
    47
    Trophy Points:
    8
    Location:
    United states
    Ratings:
    +8 / -0
    Hey y’all. Not new to the forum or the mzr engines. Just picked up a 2007 MS6. I learned my lesson on my ms3 that I still daily and checked compression before buying. 160psi across the board no fluctuation. The car has a AEM CAI and a bnr stage 1 turbo. Other than that it’s stock. It runs extremely lean and will go into the near 25s (afr) under throttle. I feel really bad because I had to drive it home. I did the fuel relief valve test. And it climbs over 1800 before releasing. So I believe that’s not the issue. It’s making plenty of fuel pressure. (I’m monitoring on my MS3’s access port). I’ll have a data log as soon as I get home this evening. It has a couple codes such as random misfire and overboosting (which it’s not) and MAF volt to high or low. The AEM intake doesn’t have straighteners in it so I don’t know if that could be an issue. More than likely getting that replaced because I don’t like the filter being in the bumper. any help would be much appreciated. I forgot to mention that when I got it, it was on a stock tune and I tried the stage 1 plus sf with no success

    i did this yesterday and i almost had a heart attack looking at the afrs when I was driving home.
     

    Attached Files:

    Last edited by a moderator: Aug 7, 2021
    Rustyms3, via an iPhone, Aug 2, 2021
    #1
    • Like Like x 2
  2. Raider

    Raider Administraider Administrator Platinum Member

    Joined:
    Jan 28, 2016
    Posts:
    5,913
    Trophy Points:
    113
    Location:
    Behind a Keyboard wearing full body armor
    Ratings:
    +6,938 / -8
    I remember the pulled the intakes without the straightener for causing issues like in 2008 or so and they brought em back with the straightener.
     
    Raider, via an iPhone, Aug 2, 2021
    #2
  3. Easter Bunny

    Easter Bunny Professional Engineer Platinum Member

    Joined:
    Feb 11, 2016
    Posts:
    1,811
    Trophy Points:
    113
    Location:
    Earth
    Ratings:
    +2,340 / -13
    That fluctuation seems too extreme for just a missing air straightener

    Any way of testing the O2 sensor?
     
    Easter Bunny, via a mobile device, Aug 2, 2021
    #3
  4. Rustyms3

    Rustyms3 Greenie Member

    Joined:
    Nov 8, 2020
    Posts:
    47
    Trophy Points:
    8
    Location:
    United states
    Ratings:
    +8 / -0
    Okay new intake will be on the way. I pulled the spill valve for fun. It’s rather dirty and there’s metal shavings in the spill valve area. The rod looks off center. I’ll be rebuilding the pump and putting fresh autotech’s in. I’m sure the pump may be freezing. I just hope the injector baskets aren’t clogged with shavings. BD00FE63-C06D-4947-9D61-C2DD3DB3187A.jpeg 276127AF-49A4-4F47-8D0D-44474ACFE77D.jpeg 5A734776-279D-4119-A626-125542C6E6FC.jpeg

    The hpfp seizing would cause huge fluctuations right? I just ordered the internals I’ll come back in a week and post my findings

    Just wan
    Just wanted to correct myself. That isn’t the piston pictured.
     
    Last edited by a moderator: Aug 7, 2021
    Rustyms3, via an iPhone, Aug 2, 2021
    #4
  5. Raider

    Raider Administraider Administrator Platinum Member

    Joined:
    Jan 28, 2016
    Posts:
    5,913
    Trophy Points:
    113
    Location:
    Behind a Keyboard wearing full body armor
    Ratings:
    +6,938 / -8
    @Rustyms3 , get some Corksport hpfp internals. I did that when my autotechs seized up.

    Oh and welcome back!
     
    Raider, via an iPhone, Aug 3, 2021
    #5
  6. Rustyms3

    Rustyms3 Greenie Member

    Joined:
    Nov 8, 2020
    Posts:
    47
    Trophy Points:
    8
    Location:
    United states
    Ratings:
    +8 / -0
    Well I just rebuilt the pump after I got off work today. It had factory internals in it and it did have some metal shavings but nothing looked worn. I put a corksport seal set and autotech internals. It still runs the exact same. I should be getting my intake tomorrow. Here's another data log. I didn't realize I had some of the log options messed up. This might give the trained eye more insight. These are just free revs.
     

    Attached Files:

  7. Rustyms3

    Rustyms3 Greenie Member

    Joined:
    Nov 8, 2020
    Posts:
    47
    Trophy Points:
    8
    Location:
    United states
    Ratings:
    +8 / -0
    I just tested the in tank fuel pressure, with it running and Revving I saw above 60psi the entire time. so I believe there isn’t an issue with fuel getting to the pump. Just trying to run down the list of possibilities.
     
    Rustyms3, via an iPhone, Aug 7, 2021
    #7
  8. Rustyms3

    Rustyms3 Greenie Member

    Joined:
    Nov 8, 2020
    Posts:
    47
    Trophy Points:
    8
    Location:
    United states
    Ratings:
    +8 / -0
    Fixed the issue. I pulled the intake off my ms3 and put it on the MS6. It runs perfect. My Cobb should be here today. Thank y’all for the help. Hope y’all have a good weekend.
     
    Rustyms3, via an iPhone, Aug 7, 2021
    #8
    • Like Like x 2
Loading...

Share This Page

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