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Is this idle ok?

Posted by FilmerDude, Jul 6, 2015

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  1. FilmerDude

    FilmerDude Proven Member

    165
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    Joined Nov 10, 2014
    Temperance, Michigan
    Used to idle around 1500 and now once my car starts it goes from 1500 to about 1100-850 range and sounds like the video attatched. It has stock cams so I'm wondering if something is wrong or not LOL. Occasionally it dies but starts right back up.

     

    Street Build 1K  0

    1992 Plymouth Laser RS Turbo AWD
    manual · 1G DSM

    Street Build 908  0

    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
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  2. awesome

    awesome Proven Member

    123
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    Joined Nov 30, 2013
    Union, New Jersey
    It's misfiring
     

    Street Build 998  1

    1998 Mitsubishi Eclipse GST
    fwd · automatic · 2G DSM
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  3. FilmerDude

    FilmerDude Proven Member

    165
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    Joined Nov 10, 2014
    Temperance, Michigan
    what could it be?
     

    Street Build 1K  0

    1992 Plymouth Laser RS Turbo AWD
    manual · 1G DSM

    Street Build 908  0

    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
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  4. Blu92

    Blu92 Proven Member

    71
    2
    Joined Aug 20, 2011
    Dale City, Virginia
    Definitely sounds like a misfire. Is your check engine light on and has any work been done on it lately or did it just happen all of a sudden?
     
  5. awesome

    awesome Proven Member

    123
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    Joined Nov 30, 2013
    Union, New Jersey
    You have a bigger then stock turbo so it could be that you are using too hot of a plug, and they are bad, I would think you should have at leat bpr7es with the turbos you have, it can also be that your upstream o2 is bad and you are running rich so your plugs are fouling. Rock auto has densos o2 for less then $30 right now. And for $10 you can buy new plugs from autozone. But I would suggest changing both at the same time.
     

    Street Build 998  1

    1998 Mitsubishi Eclipse GST
    fwd · automatic · 2G DSM
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  6. Schmegma

    Schmegma Proven Member

    31
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    Joined Nov 23, 2008
    arvada, Colorado
    As above have mentioned - misfire - check plugs, wires, tune
     
  7. FilmerDude

    FilmerDude Proven Member

    165
    6
    Joined Nov 10, 2014
    Temperance, Michigan
    Yeah I noticed my plugs were fouled after I threw my 14b on so I got some cheapos from autozone which probably was a bad idea and my upstream O2 could be bad. I have 2 different plugs that it can go into. One of them it reads 2 volts and once in awhile it'll go to 3 barely. Then if I plug it into the other plug it changes from 4-7 volts constantly. Kinda stumped on what's happening. Might also be my IM gasket
     

    Street Build 1K  0

    1992 Plymouth Laser RS Turbo AWD
    manual · 1G DSM

    Street Build 908  0

    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
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  8. JKart

    JKart Proven Member

    32
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    Joined Aug 26, 2014
    Tampa, Florida
    I agree its misfiring. Replace the plugs and check your plug wires.
     
  9. Cooper-97gst

    Cooper-97gst Proven Member

    198
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    Joined Dec 14, 2010
    San Fernando, California
    When was the last time you changed the timing belt? I bet you skipped a couple teeth. Check your mechanical timing and report back.
     

    Road Race Build 2K  0

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM
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  10. FilmerDude

    FilmerDude Proven Member

    165
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    Joined Nov 10, 2014
    Temperance, Michigan
    It was changed with the rebuild which was around 2k ago
     

    Street Build 1K  0

    1992 Plymouth Laser RS Turbo AWD
    manual · 1G DSM

    Street Build 908  0

    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
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  11. FilmerDude

    FilmerDude Proven Member

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    Joined Nov 10, 2014
    Temperance, Michigan
    I'm going to try new wires and plugs and I'll report back.
     

    Street Build 1K  0

    1992 Plymouth Laser RS Turbo AWD
    manual · 1G DSM

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    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
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  12. FilmerDude

    FilmerDude Proven Member

    165
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    Joined Nov 10, 2014
    Temperance, Michigan
    Put in new wires and still some results but a little less hesitation under load. I'm leaning towards IM gasket so I'm going to spray carb cleaner around the gasket to see if it shows any effects. I'll post results.
     

    Street Build 1K  0

    1992 Plymouth Laser RS Turbo AWD
    manual · 1G DSM

    Street Build 908  0

    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
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  13. Type1DSMr

    Type1DSMr Proven Member

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    Joined Jul 27, 2014
    Jasper, Indiana
    Which plugs are running and what's the gap?
     
    Type1DSMr

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    1997 Eagle Talon TSi AWD
    manual · 2G DSM
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  14. FilmerDude

    FilmerDude Proven Member

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    Joined Nov 10, 2014
    Temperance, Michigan
    Some cheapo's from autozone I don't remember. I gapped them to .25
     

    Street Build 1K  0

    1992 Plymouth Laser RS Turbo AWD
    manual · 1G DSM

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    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
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  15. Type1DSMr

    Type1DSMr Proven Member

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    Jasper, Indiana
    The incorrect plugs will cause a lot of misfires problems. If auto zone doesn't have them, I know advance auto has ngk bpr6es and gapped them to .28. Try those before anything else.
     
    Type1DSMr

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    1997 Eagle Talon TSi AWD
    manual · 2G DSM
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  16. FilmerDude

    FilmerDude Proven Member

    165
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    Joined Nov 10, 2014
    Temperance, Michigan
    That will be my next thing on the list after I test the IM gasket. Thanks for all of the help so far everyone.
     

    Street Build 1K  0

    1992 Plymouth Laser RS Turbo AWD
    manual · 1G DSM

    Street Build 908  0

    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
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  17. New-2-DSM

    New-2-DSM Probationary Member

    1
    1
    Joined Mar 16, 2015
    Groveport, Ohio

    I'm having idle problem with my 1G currently, it only happens when I first start it....it's would idle at 1500 rpm and then to 2000 for like a good 1.5 min. then it would drop to 500rpm. Im still trying to figure it out, wondering if it's my throttle body or the timing is off.
    I don't know if anyone is experiencing the similar problem?
     

    Street Build 715  0

    1991 Eagle Talon TSi
    manual · 1G DSM
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  18. FilmerDude

    FilmerDude Proven Member

    165
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    Joined Nov 10, 2014
    Temperance, Michigan
    Don't jack my thread man LOL go make your own post about it and you'll get more answers to your specific problem.
     

    Street Build 1K  0

    1992 Plymouth Laser RS Turbo AWD
    manual · 1G DSM

    Street Build 908  0

    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
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    DBroadard likes this.
  19. DBroadard

    DBroadard Probationary Member

    4
    1
    Joined Oct 5, 2013
    New Castle, Delaware
    Does this occur when the temperature is in optimum range for the motor? (185-210)
     
  20. FilmerDude

    FilmerDude Proven Member

    165
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    Joined Nov 10, 2014
    Temperance, Michigan
    Yes my operating temp gets around 190-200 and it does this around 1100rpm and slowly drops. Cold starts usually start at 1800 then drop to 1400-1500 with no misfire.
     

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    1992 Plymouth Laser RS Turbo AWD
    manual · 1G DSM

    Street Build 908  0

    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
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  21. DBroadard

    DBroadard Probationary Member

    4
    1
    Joined Oct 5, 2013
    New Castle, Delaware
    I'm definitely thinking a tune will fix your problem. I see other people have suggested gaping your spark plugs a bit more, that is a good route to follow. Since this only occurs at idle then a proper idle tune should do the tricl, especially if you've bolted anything on recently.
     
  22. FilmerDude

    FilmerDude Proven Member

    165
    6
    Joined Nov 10, 2014
    Temperance, Michigan
    After I fix the misfire that is my goal. I have ECU+ which is so close to Link that I'll be using for all of my tuning and logging.
     

    Street Build 1K  0

    1992 Plymouth Laser RS Turbo AWD
    manual · 1G DSM

    Street Build 908  0

    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
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  23. JKart

    JKart Proven Member

    32
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    Joined Aug 26, 2014
    Tampa, Florida
    Another reason could be a dirty intake manifold. But before opening it up, it would be better to replace the plugs and wires make sure to get the oem parts.
     
  24. FilmerDude

    FilmerDude Proven Member

    165
    6
    Joined Nov 10, 2014
    Temperance, Michigan
    Did a bit of testing today. My input and out CAS signals on my tuner reads as follows-
    Input CAS(ECU)-97-99DSM
    Output CAS(Actual CAS)-95-99DSM

    My CAS is a 97-99 and when I set the output signal to that it doesn't start at all but when I switch it back it fires right up.
    Anyways I tested some other things since the weather calmed down for a bit.
    -Injectors
    -CAS
    -Plugs
    -Wires
    I still have to test IM gasket and the O2 sensor is only reading .3-.4 volts so I'm not sure if that means it's dead or not

    The car usually will run ok for about 30 seconds at 1100rpm and drop to 900 and misfire until I shut it off and usually it will die out within 20 seconds of misfiring.
     

    Street Build 1K  0

    1992 Plymouth Laser RS Turbo AWD
    manual · 1G DSM

    Street Build 908  0

    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
    Loading...
  25. FilmerDude

    FilmerDude Proven Member

    165
    6
    Joined Nov 10, 2014
    Temperance, Michigan
    My starter ground broke off today so I fixed that and the idle seemed to get better but I'm still misfiring and at 3k I hit boost and the boost is very on/off feeling like it's building more boost at other points then in 3rd gear I have no power at all
     

    Street Build 1K  0

    1992 Plymouth Laser RS Turbo AWD
    manual · 1G DSM

    Street Build 908  0

    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
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