please advise: engine shuddering, misfiring, advancetrac warning on...

Discussion in 'Generation 4 - Maintenance & Troubleshooting' started by dillrepair, Jul 4, 2020.

  1. dillrepair

    dillrepair New Member

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    2016 sho PP with 47k miles. new to me. only had it for a week or so. clean carfax not that it matters. anyway, probably should have left well enough alone for the time being, was driving fine. changed all the fluids. and like a boss decided "hey lets go ahead and get that livernois thing" so i got the one with plugs, the cai, tuner, map, tstat.

    anyway fast forward to yesterday, was hoping they'd have sent my tune by the end of the day so i started installing parts. pulled the battery, and cleaned everything first no problem. everything went in easy. plenty of room to work. all hoses and coil packs and parts in and out easily gently. much easier than working upside down in a boat hull on a mercruiser v8. i figured it shouldn't make much difference if i have to run with slightly different parts for a day or two before installing the tune. was i wrong?

    started it up... was shuddering and running rough at first but then idle stabilized. then if you give it any gas it stutters and runs rough. did i not install the coil packs correctly? i pushed them down as far as they could go, even torqued the plugs and the hold down bolts for the coil packs carefully to spec.

    also on first startup after everything put back in "advancetrac" warning light appears... read it might be related to me just taking the battery out for a while... is that true?

    never had a vehicle before where these kind of changes would cause all hell to break loose. what do i do now just wait for the tune and hope that solves the issues? put all the old stuff back in ? nowhere in the instructions does it say wait to install the parts till you can flash the new tune... or is that just common knowledge? putting a cai and some slightly hotter plugs in a motor shouldn't make it do this.. tune or no tune

    what do you guys think? not blaming anyone here btw, just really wanting to drive my new expensive car.
     
    Last edited: Jul 4, 2020
  2. GHNorth

    GHNorth SHO Member

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    You can install everything BUT the 3-bar MAP without having a tune. The engine will not run right with stock tune and 3-bar MAP. Reinstall the stock MAP, and see if it clears up all the issues.
     
    Last edited: Jul 5, 2020
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  3. SM105K

    SM105K Streetlight Grand Prix Champ/ IG @egocheckersho

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  4. High on Ethanol

    High on Ethanol SHO Member

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    Most likely the 3bar map is causing your issues. Replace with stock until you have the tune. Everything should return to normal.
     
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  5. dillrepair

    dillrepair New Member

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    ok thanks guys.... i kind of was hoping that was what it was but by 2am i had to stop wringing my hands and go to sleep because i worked all day today. will update when i get home and try it. that sounds a lot easier than pulling the new plugs out. ive read that normally its just the battery being removed that sets off the advancetrac is this correct?

    edit: yes. no codes now, cleared the remaining few, runs like a top now. can't thank you guys enough. better than ever. i can only imagine with a tune.
     
  6. dillrepair

    dillrepair New Member

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    oh. yeah i just became a member of this forum after purchasing the vehicle on 6-23. did not see that. well.... the deed is already done. hopefully they will treat me.. and others right. so far so good but i haven't done much yet with them. i'll let you guys know one way or the other
     
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  7. FiveLeeter918

    FiveLeeter918 Ortiz Performance Sales Sponsoring Vendor Supporting Member

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    glad it was a simple fix, good luck!

    Tuning issues aside, the biggest drawback to the LMS tune is their proprietary tuning software, which locks you to their tune where as if you went with something tuning with HPTuners or SCT you could easily switch between tuners if unhappy.
     
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  8. SM105K

    SM105K Streetlight Grand Prix Champ/ IG @egocheckersho

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    Lee is being modest. Those other tuners are out performing LMS and doing it safer as well.
     
  9. Csbbrah

    Csbbrah SHO Member

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    For the most part LMS will be "okay" but not optimal. Latest tune fixes issues for most, leaves a lot on the table however. One size fits all tune just doesnt work well for these cars.

    Sent from my LM-Q610(FGN) using Tapatalk
     
  10. dillrepair

    dillrepair New Member

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    yeah, i'm seeing what you mean looking around on theinternet.com. normally i do a lot of research on these kind of things but i had been thinking about getting a sho for a while and just kind of pulled the trigger on everything all at once because time has been so limited for me lately. drove to nebraska with my old shitbox escape to get this car after a night shift at the hospital. now if they would just send me the damn tune file already...
     
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  11. robert francis

    robert francis New Member

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    You will be surprised at your "Livernois" tune. It'll wake your Taurus up. I've qad it on mine since last year and never any issues. And never a problem talking to Livernois.
     
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  12. dillrepair

    dillrepair New Member

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    i'm happy so far. i don't really know what i'm doing in the world of gasoline tuning though. give me a cummins and i can play around quite a bit. so i'm still learning what to look for and what i even want out of it. a few things i want to figure out... the methanol thing i have in another post, and what pids are what in the mycalibrator so i can watch the parameters i want to... like ptu temp.
     
  13. robert francis

    robert francis New Member

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    "My Calibrator" will sqow tqe "PIDs" available - and you select from tqem. But I doubt "PTU temp" is one of tqem.
     

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