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Rough idle when hot

Posted by Walwal44, Aug 11, 2016

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  1. Walwal44

    Walwal44 Probationary Member

    10
    0
    Joined Aug 11, 2016
    Douglassville, Pennsylvania
    I have a 1995 eagle talon tsi awd and when its started cold the engine idles perfectly fine but once its up to operating temp and i go to start it, it idles very rough bouncing between 500-800rpm. I cannot figure it out.
     

    999  0

    1995 Eagle Talon TSi AWD
    manual · 2G DSM
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  2. miliman13

    miliman13 Proven Member

    1,566
    268
    Joined Jan 1, 2011
    tampa, Florida

    2K  0

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM

    1K  0

    1998 Mitsubishi Eclipse GSX
    13.066 @ 106.880 · 2G DSM
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  3. Walwal44

    Walwal44 Probationary Member

    10
    0
    Joined Aug 11, 2016
    Douglassville, Pennsylvania
    Its in closed loop. I have gone over the ignition system and that all came back good. It is in timing. The fuel filter is original but i cannot get the banjo bolt out. There are no vacuum leaks. And the pcv is new. Oil pressure is okay. It has unknown miles on the engine because it was replaced.
     

    999  0

    1995 Eagle Talon TSi AWD
    manual · 2G DSM
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  4. Walwal44

    Walwal44 Probationary Member

    10
    0
    Joined Aug 11, 2016
    Douglassville, Pennsylvania
    When you start the vehicle it stumbles and struggles to run for about 5 secs and then it flattens out and ildes perfect. It only happens when the vehicle is started at operating temp. It does not make any bottom end noises but it feels like it is missing. It has good compression (cant remember it off the top if my head but was in spec)
     

    999  0

    1995 Eagle Talon TSi AWD
    manual · 2G DSM
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  5. Detail

    Detail Supporting VIP

    370
    23
    Joined May 28, 2003
    Marietta, Georgia
    I'm guessing that you do not have the stock fuel pressure regulator installed and perhaps the two vac lines from the sensor on the firewall near the brake master cylinder are not connected.
     

    335  5

    1995 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    747  23

    1995 Eagle Talon TSi AWD
    14.000 @ 109.000 · 2G DSM
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  6. Walwal44

    Walwal44 Probationary Member

    10
    0
    Joined Aug 11, 2016
    Douglassville, Pennsylvania
    They are connected and yes it is original
     

    999  0

    1995 Eagle Talon TSi AWD
    manual · 2G DSM
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  7. jman1699

    jman1699 Proven Member

    33
    4
    Joined Mar 14, 2015
    columbus, Ohio
    Closed loop should run smoother because computer is calculating fuel trim unless you have mods and not in parameters of original tune. I agree with detail probably a fuel problem, id smack a fuel pressure test and check go from there

    Also any smoke on start up
     

    Street Build 616  1

    1999 Mitsubishi Eclipse Spyder GST
    fwd · automatic · 2G DSM
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  8. Detail

    Detail Supporting VIP

    370
    23
    Joined May 28, 2003
    Marietta, Georgia
    Do a search on "vapor lock". That should point you in the right direction. There are quite a few things it could actually be.
     

    335  5

    1995 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    747  23

    1995 Eagle Talon TSi AWD
    14.000 @ 109.000 · 2G DSM
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  9. Walwal44

    Walwal44 Probationary Member

    10
    0
    Joined Aug 11, 2016
    Douglassville, Pennsylvania
    No smoke on start up
     

    999  0

    1995 Eagle Talon TSi AWD
    manual · 2G DSM
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  10. PlanZero

    PlanZero Proven Member

    1,376
    259
    Joined Aug 13, 2013
    Easton, Pennsylvania
    Does the idle even out after 30 seconds or so? Apparently this is a common problem; both of mine do it on hot starts, on hot days especially. I used to care, then after chasing the problem with no luck I just gave up.
     

    Street Build 4K  8

    1996 Eagle Talon TSi
    fwd · automatic · 2G DSM

    Street Build 2K  0

    1997 Eagle Talon TSi AWD
    automatic · 2G DSM
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  11. Walwal44

    Walwal44 Probationary Member

    10
    0
    Joined Aug 11, 2016
    Douglassville, Pennsylvania
    I figured it out. I noticed that my check engine light wasnt coming on when i turned the car on. Pulled the cluster and the PO pulled the buld. Hooked up a modis and it i had a code for first O2. Replaced it and havent had a problem since. Sorry for the time jt took to relpy
     

    999  0

    1995 Eagle Talon TSi AWD
    manual · 2G DSM
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