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Thread: High idle when cruise, Comp Cam 268

  1. #1
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    Question High idle when cruise, Comp Cam 268

    Hello guys, nice to meet you...

    This is my last chance, to solve my biggest problem in my live, at the moment.

    Two years ago, I had the dump idea, to swap a 6.1 Hemi into my Chrysler 300C LX with 5.7 Hemi.
    So I bought a car with a body damage, take out the Engine, transmission and all the other stuff like PCM, TCM...
    I teared down the Engine, build it up with ne parts from Melling and Mopar and put in a Comp Cam 268, with better valve springs.
    After I put everything together, I had installed a custom tune from my tuning dealer and start driving.
    The PCM was taken from the 6.1 vehicle from 2006. The tuning software was from diablo with intune.
    After 1 year driving an testing an 25 tunes later, my tuner said, there must be an issue with the engine like vacuum leak etc.,
    because the engine drive without foot on the gas, with 1200 rpm in each gear, until I slow down to maybe 25 KPH.
    I had tear down the intake several times, with new gaskets, but it won't get better.
    Now, after I had heard from HPTuners and the throttle crackers, with many videos on Youtube, I bought the interface and credits, read out the tune
    and try my best, to delete the Idle. First I take down every idle adders, after that, I modified the throttle voltages and airflow. (Throttle Body Airflow and feedforward control small and large range). This helps a lot and the high idle was gone, until I started to take the fuel trims to zero. My fuel trims at idle were at +8% in the log file.
    If I add these 8% in the editor, clear all adaptives and drive, the first 50km are good, but after these, the idle starts to go up.
    I'm at the bottom of hope, please can someone help me with this issue?6.1hemicompcam.hpt
    Last edited by 300c-Power; 08-05-2019 at 06:31 PM. Reason: wrong title

  2. #2
    Tuner in Training PurpleRam's Avatar
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    I can't answer you Question, Not sure how. ...but the guy who started this thread https://forum.hptuners.com/showthrea...08-srt-426-n-a had a similar issue but keep in mind his cam and engine is bigger.
    Also I noticed Engine General you changed engine size to 6.1 but left Displacement as 5.7 I read some where on here that can be an issue , If I'm wrong I hope some one comes by and corrects me.

  3. #3
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    Quote Originally Posted by PurpleRam View Post
    I can't answer you Question, Not sure how. ...but the guy who started this thread https://forum.hptuners.com/showthrea...08-srt-426-n-a had a similar issue but keep in mind his cam and engine is bigger.
    Also I noticed Engine General you changed engine size to 6.1 but left Displacement as 5.7 I read some where on here that can be an issue , If I'm wrong I hope some one comes by and corrects me.
    Thank you for your answer. I also had played with the throttle maps, but after driving some miles, the car cruises again with high idle. The next thing I have noticed... When I drive 300 miles after Upload the tuning file, Park the Car, start it Again and drive with 3000 rpm, switch into N, the rpm stays at 3000rpm until I stop the car.

  4. #4
    Tuner coanan's Avatar
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    He's using the 6.1 ECM, maybe it should be 6.1 in displacement. Normally using the original ECM you would leave the 5.7.

    Do some air flow comparisons.
    Attached Files Attached Files
    Last edited by coanan; 08-06-2019 at 06:23 PM.
    2013 Chrysler 300S, 6.4 BGE with 6.4 SRT cam, AIT 18% OD pulley, E-force with 2.75 pulley(11.4lbs boost), fastman 84+4 mm throttle body, 1 7/8 kooks long tubes w/hi-flow cats, Magnaflow Cat-back, FTI 2800 stall, Trans built by Hellraiser, Dings Racing valve body and tune, Getrag 3.73, Walbro 400LPH, DW 65# inj. LG aluminum rad. Dual SRT fans. Complete 4 piston Brembo upgrade. Stage one MOPAR springs, XIX X39 22x9 +15 - 22x10.5 +22 with NITTO 420 275/40R22 - 295/30R22

  5. #5
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    Thank you for your message. I have tried it with the 5.7 PCM but it was undriveable. Also, the Maps from the 5.7 PCM ends at 5800rpm

  6. #6
    Quote Originally Posted by 300c-Power View Post
    Thank you for your message. I have tried it with the 5.7 PCM but it was undriveable. Also, the Maps from the 5.7 PCM ends at 5800rpm
    All that can be changed..

  7. #7
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    Quote Originally Posted by Kmoney View Post
    All that can be changed..
    Can you help me with that???

  8. #8
    Check your idle speed rolling adder settings, make sure these are zeroed out as well

  9. #9
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    Hello again, thank you for your attention. All the adders are zeroed out. This was the first thing, I had done. If I use my original 5,7l ECU with the Tuning File it won?t start, because the Injectors shuts or after a half of a second. My tuner had modded the tune, but I don?t know, what he has done. With the modded tune, the Engine starts and sounds good, but after maybe 2 minutes, it begins to surge between 1400 and 1200 rpm. If this happens and I restart it, it begins to idle up to the idle Rev limiter for 5 seconds and come down slowly to 1400rpm and begins surging again. It?s not drivable, because it?s over the transmission stall Speed. Anyone an idea?

  10. #10
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    The Airflow tables look off. Here is some things you can try:

    - Disable Sensed MAP
    - Enable Baro Learning
    - Reduce Max Airflow by 40%

    - Airflow Table - Remove 20% from rows 0-.71 and 14% from rows .87 - 1.02
    - Small Range Table - Add 45% to the entire table
    - Large Range Table - Add 44% to rows 0 - 501, 40% to row 902, and 19% to rows 1853 and greater

  11. #11
    Did you already adjust your Torque Airflow Offset tables? These make a big difference in idle with minimal changes.

  12. #12
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    Thank you, but if I do this, the rows are exactly the same as stock. Disable Sensed Map doesn?t change anything. Only the fuel Trims goes to -10%.
    The only thing that control the Idle in my care are small Range and Large Range Table. The airflow table didn?t change anything and also the torque airflow offset table.

  13. #13
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    You may want to set the Fuel Trim Cells Idle Select to VSS.

    The first step was to bring your tables closer to stock on the bottom rows. Based on some calculations I did vs. stock, you can give these a try:

    ETC TB Airflow
    0 0
    0.0977517106549365 35.9133025099166
    0.20039100684262 83.1363190699173
    0.298142717497556 144.446874183532
    0.40078201368524 222.02754424639
    0.498533724340176 317.068825474291
    0.557184750733138 380.958789055468
    0.713587487781036 576.398584482362
    0.869990224828935 727.790019924718
    1.02150537634409 946.444491559679
    1.56402737047898 1389.50749987263
    2.02834799608993 2213.92612931298
    2.56598240469208 3445.49446455636
    3.03030303030303 4769.52467256008
    3.20136852394917 5000.08410635302
    3.40175953079179 5357.23297109253
    3.57771260997067 5833.43145741186
    3.69990224828935 6131.05551136144
    3.79765395894428 6309.6299437312
    3.90029325513196 6309.6299437312

    Small Range
    0 0
    31.180770027062 0.0854700854700855
    72.2358380940138 0.16971916971917
    125.63765402403 0.255189255189255
    193.044851867768 0.340659340659341
    275.713033102828 0.424908424908425
    331.316026931846 0.473748473748474
    501.171004596043 0.605616605616606

    Large Range
    0 0
    31.2505256647064 0.0854700854700855
    72.1738330827743 0.16971916971917
    125.7461627937 0.255189255189255
    192.959594977314 0.340659340659341
    275.798289993282 0.424908424908425
    331.354780063871 0.473748473748474
    501.248510860092 0.605616605616606
    901.552863422284 1.02197802197802
    1852.70973583616 1.7985347985348
    2951.93457508996 2.33211233211233
    4593.82727271184 2.95115995115995
    6359.23395272279 3.48473748473748
    6666.7788084707 3.68009768009768
    7142.97729479003 3.91086691086691
    7777.90860988248 4.11721611721612
    8412.83992497493 4.36996336996337