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Rpms drop when clutch pushed in!!!

Posted by DSM Chase, Mar 5, 2012

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  1. DSM Chase

    DSM Chase Proven Member

    706
    47
    Joined Sep 19, 2011
    Brooks, Georgia
    I have had this problem now for months... I cannot figure it out all my link numberes are good. When the clutch is pushed in while changing gears or at a stop light the rpms will drop, Also when i rev it up and let off the gas it rpm drops.... sometimes even shut off :(. My ISC motor tested good all coils at 29 OHMS...

    Also my BOV is resirculated...
    7lb lighter than stock flywheel
    simulating idle switch on LINK
    Link idle setting at 1k
    battery at 13.5v

    TPS is at 0.68 at idle and 5.0V at WOT so its good?

    ECMLINK Log file.... Its towards the end of the log i am driving down the road and then when i go to turn into my driveway when i pushed the clutch in it happend... Im going about 13MPH when it happens drops to around 400-500RPMS then shoots back to 1000...Log is at the bottom In the Attached Files..

    Quick video of it rev RPM dropping, does same thing with clutch in or in neutral


    RPM Drop ISSUE - YouTube
     

    Attached Files:

    Last edited: May 7, 2012

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    automatic · 1G DSM

    Street Build 5K  0

    1990 Mitsubishi Eclipse GSX
    10.504 @ 139.65 · 1G DSM
    Loading...
  2. RNR_MOTORS

    RNR_MOTORS Probationary Member

    24
    0
    Joined Feb 9, 2009
    novi, Michigan
    is your bov recirculated?
     
  3. eli96talon

    eli96talon Proven Member

    113
    0
    Joined Feb 16, 2012
    mt.pleasant, Texas
    I had that issue also my injector seals were bad I changed them out and it stoped turning off on me
     
  4. Tyeler18

    Tyeler18 Proven Member

    2,070
    79
    Joined Dec 16, 2008
    Casa Grande, Arizona
    There's a couple different causes to this, but post up a log for starters and any mods.

    The only time I've personally ever had this problem was when my MAF was going bad.
     

    Drag Race Build 699  1

    1991 Eagle Talon TSi AWD
    awd · automatic · 1G DSM

    Road Race Build 706  0

    1990 Eagle Talon TSi AWD
    manual · 1G DSM

    Autocross Build 960  0

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM

    Road Race Build 1K  0

    1991 Mitsubishi Galant VR-4
    manual · Galant VR-4
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  5. DSM Chase

    DSM Chase Proven Member

    706
    47
    Joined Sep 19, 2011
    Brooks, Georgia
    Injectors are BRAND new FIC 1150's, MAF is good, BOV is resirculated
     

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    automatic · 1G DSM

    Street Build 5K  0

    1990 Mitsubishi Eclipse GSX
    10.504 @ 139.65 · 1G DSM
    Loading...
  6. 97gsxerrr

    97gsxerrr Proven Member

    35
    0
    Joined Oct 27, 2009
    Cedar Falls, Iowa
    Mine would do it just about every time when my bov wasn't recirculated
     
  7. RNR_MOTORS

    RNR_MOTORS Probationary Member

    24
    0
    Joined Feb 9, 2009
    novi, Michigan
    im gonna agree with the previous post the maf might be on its way out or i would check the tps sensor that might be on its way out too
     
  8. GSLENK

    GSLENK Proven Member

    1,233
    48
    Joined May 25, 2011
    DC, Maryland
    rpms should drop when switching gears. now, when you are in neutral and you push it in and it drops that could be bad.

    Idk how, at rest, the clutch should be engaged, and at a stop, that would drop rpms to a stall. then pressing the pedal, should release pressure and friction and allow the car to idle (raise rpm) I cannot possibly see how pressing the clutch drops rpms unless the car is in motion.

    I mean the clutch is a pretty simple system. if the pivot ball os over shimmed then clutch may be partially disengaged at rest which would slip and raise rpm not lower. if it is undershimmed then you would have disengagement issues, again that wouldnt lower rpm.

    I see no point of going in neutral and taking your foot off the clutch and reving it to see if the car moves (disengagement issue)

    I dont really see how that is possible form a clutch standpoint.

    So it has to be your idle itself. nothing to do with the clutch. at all.
    either you have a racecar bov, (vented) or boost/vac leak. or something else is off, fuel trims, something air/spark/fuel (most likely air or fuel) that is affecting proper idle. So you have a wideband hooked up and logging?
     

    4K  6

    1992 Plymouth Laser RS Turbo AWD
    awd · manual · 1G DSM
    Loading...
  9. Str8Tune

    Str8Tune Proven Member

    93
    0
    Joined Feb 12, 2012
    Joshua Tree, California
    Check your tps
     

    216  0

    1999 Mitsubishi Eclipse GST
    · 2G DSM
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  10. Lou98GSX

    Lou98GSX Proven Member

    663
    47
    Joined Mar 13, 2004
    Carmel, New York
    my car did this after dsmlink install the new version ecmlink should take car of this problem with the idle clamp feature . what i do so it doesn't stall is try lifting off the gas while still in gear and then putting it in neutral and rolling to a stop. if that works then its the link for sure. i had dsm chips before link and car never stalled. the worst is in parking lot maneuvers
     
  11. GSLENK

    GSLENK Proven Member

    1,233
    48
    Joined May 25, 2011
    DC, Maryland
    yeah also that closed throttle switch. Im on link and I "simulate" the switch through tps percentage.
     

    4K  6

    1992 Plymouth Laser RS Turbo AWD
    awd · manual · 1G DSM
    Loading...
  12. DSM Chase

    DSM Chase Proven Member

    706
    47
    Joined Sep 19, 2011
    Brooks, Georgia
    I am simulating the tps I have a greddy type s bov
     

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    automatic · 1G DSM

    Street Build 5K  0

    1990 Mitsubishi Eclipse GSX
    10.504 @ 139.65 · 1G DSM
    Loading...
  13. Tyeler18

    Tyeler18 Proven Member

    2,070
    79
    Joined Dec 16, 2008
    Casa Grande, Arizona
    What flywheel are you using?
     

    Drag Race Build 699  1

    1991 Eagle Talon TSi AWD
    awd · automatic · 1G DSM

    Road Race Build 706  0

    1990 Eagle Talon TSi AWD
    manual · 1G DSM

    Autocross Build 960  0

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM

    Road Race Build 1K  0

    1991 Mitsubishi Galant VR-4
    manual · Galant VR-4
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  14. DSM Chase

    DSM Chase Proven Member

    706
    47
    Joined Sep 19, 2011
    Brooks, Georgia
    Its a steel lightened flywheel 7lbs lighter than stock, came with my competition 6 puck clutch



    Also could this be a spark problem? Like a coil pack or plug wire issue, randomly, not always when I fire it I will get a check engine light and in my link it will say a random misfire detected or #2 cylinder misfire detected.... Plugs are brand new bpr7es gapped at .25
     

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    automatic · 1G DSM

    Street Build 5K  0

    1990 Mitsubishi Eclipse GSX
    10.504 @ 139.65 · 1G DSM
    Loading...
  15. Tyeler18

    Tyeler18 Proven Member

    2,070
    79
    Joined Dec 16, 2008
    Casa Grande, Arizona
    More than likely its your flywheel.
     

    Drag Race Build 699  1

    1991 Eagle Talon TSi AWD
    awd · automatic · 1G DSM

    Road Race Build 706  0

    1990 Eagle Talon TSi AWD
    manual · 1G DSM

    Autocross Build 960  0

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM

    Road Race Build 1K  0

    1991 Mitsubishi Galant VR-4
    manual · Galant VR-4
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  16. 95talongirl

    95talongirl Supporting Member

    1,012
    162
    Joined Feb 9, 2008
    On a Jet Plane, Illinois
    Yea, with the lighter flywheel, bump your base idle up to about 800-1000rpm.
     

    4K  32

    1995 Eagle Talon TSi AWD
    11.437 @ 126.42 · 2G DSM
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  17. DSM Chase

    DSM Chase Proven Member

    706
    47
    Joined Sep 19, 2011
    Brooks, Georgia
    My idle setting is at 1k...
     

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    automatic · 1G DSM

    Street Build 5K  0

    1990 Mitsubishi Eclipse GSX
    10.504 @ 139.65 · 1G DSM
    Loading...
  18. DSM Chase

    DSM Chase Proven Member

    706
    47
    Joined Sep 19, 2011
    Brooks, Georgia
    still having this problem, any ideas??
     

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    automatic · 1G DSM

    Street Build 5K  0

    1990 Mitsubishi Eclipse GSX
    10.504 @ 139.65 · 1G DSM
    Loading...
  19. 4g63monstr

    4g63monstr Proven Member

    116
    3
    Joined Apr 1, 2009
    Orlando, Florida
    I vote check crankshaft endplay. I know that noone wants to hear this, but this happened to my car exactly as you described it. Turned out that I had a lot of endplay in the crank. Just check it to put your mind at ease.
     

    721  0

    1995 Eagle Talon TSi AWD
    14.137 @ 97.100 · 2G DSM
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  20. hypergenesis

    hypergenesis Proven Member

    693
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    Joined Oct 21, 2010
    Tracy, California
    Nvm 4g63monstr beat me to the crankwalk theory xD
     
    Last edited: Mar 12, 2012

    547  0

    1996 Mitsubishi Eclipse GST
    manual · 2G DSM
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  21. Bo0sTdTsI

    Bo0sTdTsI Proven Member

    236
    1
    Joined Jan 21, 2010
    Amarillo, Texas
    Last problem i had similar to my 1g ended up being my shift linkage. But i could be wrong. Mine stalled when clutch was pushed in and had to gas it more to get it to go. Worth a try. Good luck.
     

    398  0

    1990 Eagle Talon TSi AWD
    · 1G DSM
    Loading...
    niki_talon likes this.
  22. DSM Chase

    DSM Chase Proven Member

    706
    47
    Joined Sep 19, 2011
    Brooks, Georgia
    I thought if it was walking the clutch would be all over the place
     

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    automatic · 1G DSM

    Street Build 5K  0

    1990 Mitsubishi Eclipse GSX
    10.504 @ 139.65 · 1G DSM
    Loading...
  23. 92gsxecl1pse

    92gsxecl1pse Proven Member

    79
    0
    Joined May 9, 2009
    Columbus, Ohio
    I am having the same problem....when coming to a stop ill push the clutch in and the car turns off. I'm running speed density tho. I have a 1g 7bolt.
     

    289  0

    1992 Mitsubishi Galant VR-4
    manual · Galant VR-4
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  24. hypergenesis

    hypergenesis Proven Member

    693
    1
    Joined Oct 21, 2010
    Tracy, California
    It wasn't for mine either, I had a 6 puck Unsprung ACT2100 and never had a clutch issue until randomly my car started dying on the highway, Turned the wheel to the left car would die, etc. etc.
     

    547  0

    1996 Mitsubishi Eclipse GST
    manual · 2G DSM
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  25. TrystanGST

    TrystanGST Proven Member

    333
    1
    Joined Jul 29, 2004
    Chicago, Illinois
    TPS should be closer to 0.63 at idle. Make sure the idle switch is -1 at idle and throttle position reads 0%. Your ISC should read about 30. Try to get all these values correct without using Link to "simulate" if you can. I solved a lot of idle problems when I took the time to make sure everything was set correctly.
     
    Last edited by a moderator: Jul 10, 2014

    495  0

    1995 Mitsubishi Eclipse GSX
    manual · 2G DSM
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