Page 1 of 2 12 LastLast
Results 1 to 20 of 29

Thread: E40 ls7 maf. At idle pulls spark from .044 and down and backwards??

  1. #1
    Advanced Tuner
    Join Date
    May 2009
    Posts
    479

    E40 ls7 maf. At idle pulls spark from .044 and down and backwards??

    First start on car and the car pops bad. Did data log and it looks as though it's taking timing from the lower half of the left side of the map and down. Any ideas why it would do this? Maf is facing in the right direction and everything is plugged in correctly.
    Last edited by Snyper; 04-26-2012 at 12:00 AM.
    2018 Infiniti Q60s


    2004 350z/LS2: ERL 434ci, 11.8:1,TFS245cc,262/266@113+3,Fast102,NX 102 plate,60#injectors/return w/twin 255s
    Old setup: CNC'd317s, Fast 102, 228/228@114, PT88,83#injectors/full return system. 10.84@138

  2. #2
    Advanced Tuner
    Join Date
    May 2009
    Posts
    479
    2018 Infiniti Q60s


    2004 350z/LS2: ERL 434ci, 11.8:1,TFS245cc,262/266@113+3,Fast102,NX 102 plate,60#injectors/return w/twin 255s
    Old setup: CNC'd317s, Fast 102, 228/228@114, PT88,83#injectors/full return system. 10.84@138

  3. #3
    Senior Tuner IDRIVEAG8GT's Avatar
    Join Date
    Aug 2010
    Location
    Roswell, N.M.
    Posts
    1,956
    Your MAF is upside down.
    Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.

    PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.

    Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
    618/618 motor
    906/862 spray

    Caterpillar 50 Forklift- Duramax swap

  4. #4
    Senior Tuner Mep_q8's Avatar
    Join Date
    Mar 2006
    Location
    Kuwait
    Posts
    1,564
    they do have an arrow on mafs for begginers

    Bader Norris
    MEP Tuned
    Telephone: +965-55446651
    Email: [email protected]
    Instagram

  5. #5
    Advanced Tuner
    Join Date
    May 2009
    Posts
    479
    The arrow is pointing towards the TB. Double and triple checked and the coupler is on very tight. Im running pure maf mode as well.
    Last edited by Snyper; 04-25-2012 at 11:00 PM.
    2018 Infiniti Q60s


    2004 350z/LS2: ERL 434ci, 11.8:1,TFS245cc,262/266@113+3,Fast102,NX 102 plate,60#injectors/return w/twin 255s
    Old setup: CNC'd317s, Fast 102, 228/228@114, PT88,83#injectors/full return system. 10.84@138

  6. #6
    Senior Tuner Mep_q8's Avatar
    Join Date
    Mar 2006
    Location
    Kuwait
    Posts
    1,564
    if its pure MAF, what kind of MAP sensor do you have installed? Is it calibrated right? Post up your file with a log.

    One reason could be the throttle body not opening enough at idle. Causing a big enough vacuum for the MAF to read high. What TB are you using?
    Last edited by Mep_q8; 04-25-2012 at 11:06 PM.

    Bader Norris
    MEP Tuned
    Telephone: +965-55446651
    Email: [email protected]
    Instagram

  7. #7
    Advanced Tuner
    Join Date
    May 2009
    Posts
    479
    I notice on the log file with the Key on car off and scanning the histogram plot is sitting at 0.0 rpm and .52 g/cyl instead of 0 and .08. Factory MAP sensor with factory cal. Stock throttle body.
    Last edited by Snyper; 04-25-2012 at 11:07 PM.
    2018 Infiniti Q60s


    2004 350z/LS2: ERL 434ci, 11.8:1,TFS245cc,262/266@113+3,Fast102,NX 102 plate,60#injectors/return w/twin 255s
    Old setup: CNC'd317s, Fast 102, 228/228@114, PT88,83#injectors/full return system. 10.84@138

  8. #8
    Senior Tuner Mep_q8's Avatar
    Join Date
    Mar 2006
    Location
    Kuwait
    Posts
    1,564
    try setting your EQ Ratio minimum to 1.0. Your commanding 2.90 that doesn't even move when you crank the motor. Looks like your asking for too much fuel so its flooding the motor.

    Bader Norris
    MEP Tuned
    Telephone: +965-55446651
    Email: [email protected]
    Instagram

  9. #9
    Advanced Tuner
    Join Date
    May 2009
    Posts
    479
    That wouldn't make the ECU use timing from the wrong part of the MAP. And where? in my tune its 1.0 by 111* and up?
    2018 Infiniti Q60s


    2004 350z/LS2: ERL 434ci, 11.8:1,TFS245cc,262/266@113+3,Fast102,NX 102 plate,60#injectors/return w/twin 255s
    Old setup: CNC'd317s, Fast 102, 228/228@114, PT88,83#injectors/full return system. 10.84@138

  10. #10
    Senior Tuner IDRIVEAG8GT's Avatar
    Join Date
    Aug 2010
    Location
    Roswell, N.M.
    Posts
    1,956
    Then the MAF is wired wrong.
    Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.

    PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.

    Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
    618/618 motor
    906/862 spray

    Caterpillar 50 Forklift- Duramax swap

  11. #11
    Advanced Tuner
    Join Date
    May 2009
    Posts
    479
    Checked MAF wiring as well. Current performance did my harness and they wired in an LS7 MAF connector. I checked the pinouts and they are dead on. Could the MAF itself just be bad? I noticed in my tune I had the p0101 106 121 tests set to turn on at MAX temp..so the MAF test never ran. Maybe the maf itself is bad? Would a bad maf do this?
    2018 Infiniti Q60s


    2004 350z/LS2: ERL 434ci, 11.8:1,TFS245cc,262/266@113+3,Fast102,NX 102 plate,60#injectors/return w/twin 255s
    Old setup: CNC'd317s, Fast 102, 228/228@114, PT88,83#injectors/full return system. 10.84@138

  12. #12
    Senior Tuner Mep_q8's Avatar
    Join Date
    Mar 2006
    Location
    Kuwait
    Posts
    1,564
    Its using the timing from your cranking spark which is set at 11.

    You still haven't gotten the motor to warm up let alone idle for a second to see what timing is coming from where.

    Your commanding a shit load of fuel at start up, from where, thats a pain in the ass finding out. Do you have your stock file you can compare this to?

    Bader Norris
    MEP Tuned
    Telephone: +965-55446651
    Email: [email protected]
    Instagram

  13. #13
    Senior Tuner IDRIVEAG8GT's Avatar
    Join Date
    Aug 2010
    Location
    Roswell, N.M.
    Posts
    1,956
    Quote Originally Posted by Snyper View Post
    Checked MAF wiring as well. Current performance did my harness and they wired in an LS7 MAF connector. I checked the pinouts and they are dead on. Could the MAF itself just be bad? I noticed in my tune I had the p0101 106 121 tests set to turn on at MAX temp..so the MAF test never ran. Maybe the maf itself is bad? Would a bad maf do this?
    Well fuck. I'm out of logical ideas. Remove the MAF and spray it down with some brake cleaner and inspect the air meter. There could either be a piece of trash stuck on it or it is broken/fried.
    Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.

    PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.

    Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
    618/618 motor
    906/862 spray

    Caterpillar 50 Forklift- Duramax swap

  14. #14
    Advanced Tuner
    Join Date
    May 2009
    Posts
    479
    Quote Originally Posted by Trailblazin' View Post
    Its using the timing from your cranking spark which is set at 11.

    You still haven't gotten the motor to warm up let alone idle for a second to see what timing is coming from where.

    Your commanding a shit load of fuel at start up, from where, thats a pain in the ass finding out. Do you have your stock file you can compare this to?


    The engine is a 434 stroker with a 262/266 cam. I redid the start up airflow and added 10% to 68* and above which probably won't be enough.
    2018 Infiniti Q60s


    2004 350z/LS2: ERL 434ci, 11.8:1,TFS245cc,262/266@113+3,Fast102,NX 102 plate,60#injectors/return w/twin 255s
    Old setup: CNC'd317s, Fast 102, 228/228@114, PT88,83#injectors/full return system. 10.84@138

  15. #15
    Senior Tuner Mep_q8's Avatar
    Join Date
    Mar 2006
    Location
    Kuwait
    Posts
    1,564
    Quote Originally Posted by Snyper View Post
    Checked MAF wiring as well. Current performance did my harness and they wired in an LS7 MAF connector. I checked the pinouts and they are dead on. Could the MAF itself just be bad? I noticed in my tune I had the p0101 106 121 tests set to turn on at MAX temp..so the MAF test never ran. Maybe the maf itself is bad? Would a bad maf do this?
    No that shouldn't be a problem. It will still show if there is a problem with the MAF sensor. Do you not have any DTCs? Unplug the maf and crank the motor.

    Bader Norris
    MEP Tuned
    Telephone: +965-55446651
    Email: [email protected]
    Instagram

  16. #16
    Advanced Tuner
    Join Date
    May 2009
    Posts
    479
    Quote Originally Posted by IDRIVEAG8GT View Post
    Well fuck. I'm out of logical ideas. Remove the MAF and spray it down with some brake cleaner and inspect the air meter. There could either be a piece of trash stuck on it or it is broken/fried.
    Would a bad maf do the same thing? I did drop the maf on the ground last week before installing it. It fell out of my pocket..but it wasn't damaged at all.
    2018 Infiniti Q60s


    2004 350z/LS2: ERL 434ci, 11.8:1,TFS245cc,262/266@113+3,Fast102,NX 102 plate,60#injectors/return w/twin 255s
    Old setup: CNC'd317s, Fast 102, 228/228@114, PT88,83#injectors/full return system. 10.84@138

  17. #17
    Senior Tuner IDRIVEAG8GT's Avatar
    Join Date
    Aug 2010
    Location
    Roswell, N.M.
    Posts
    1,956
    Quote Originally Posted by Snyper View Post
    Would a bad maf do the same thing? I did drop the maf on the ground last week before installing it. It fell out of my pocket..but it wasn't damaged at all.
    Yep, that could've broken the sensor lead. Check the internals with a magnifying glass. I bet You'll find your problem.
    Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.

    PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.

    Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
    618/618 motor
    906/862 spray

    Caterpillar 50 Forklift- Duramax swap

  18. #18
    Advanced Tuner
    Join Date
    May 2009
    Posts
    479
    Fmsl.
    2018 Infiniti Q60s


    2004 350z/LS2: ERL 434ci, 11.8:1,TFS245cc,262/266@113+3,Fast102,NX 102 plate,60#injectors/return w/twin 255s
    Old setup: CNC'd317s, Fast 102, 228/228@114, PT88,83#injectors/full return system. 10.84@138

  19. #19
    Senior Tuner IDRIVEAG8GT's Avatar
    Join Date
    Aug 2010
    Location
    Roswell, N.M.
    Posts
    1,956
    Quote Originally Posted by Snyper View Post
    Fmsl.
    Fuck my...... Something..... Life lol. Just inspect the MAF closely under a good light. Tell us what you find.
    Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.

    PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.

    Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
    618/618 motor
    906/862 spray

    Caterpillar 50 Forklift- Duramax swap

  20. #20
    Advanced Tuner
    Join Date
    May 2009
    Posts
    479
    fuck my stupid life.
    2018 Infiniti Q60s


    2004 350z/LS2: ERL 434ci, 11.8:1,TFS245cc,262/266@113+3,Fast102,NX 102 plate,60#injectors/return w/twin 255s
    Old setup: CNC'd317s, Fast 102, 228/228@114, PT88,83#injectors/full return system. 10.84@138