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new engine, only firing on 1 cylinder

Posted by tumbler, Jun 7, 2012

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  1. tumbler

    tumbler Probationary Member

    25
    0
    Joined Feb 15, 2006
    Sicklerville, New Jersey
    replaced the 420a engine in my 1997 eclipse gs m/t. replaced complete harness and ecu.(previous owner butchered harness) i have 220 psi compression across the cylinders. i have spark and a noid light confirms injectors are pulsing. but when it fires up it is only running on cylinder #4. anyone ever have a problem like this. bought car and extra parts thinking i would put engine and harness in and it would fire up and run normal......not so , so far. any help would be appreciated.
     

    Street Build 254  1

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM
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  2. jayson427

    jayson427 Proven Member

    1,403
    2
    Joined Dec 20, 2011
    Mesa, Arizona
    Not sure of where to point you in the right direction but I tried to do a harness/ecu and tranny swap. I had a few different issues because of certain ground wires I missed. is the harness and ecu the same year as your motor? are you sure its only one cylinder? 1 & 4 run together of off the coil I was going to say test your coil but hmm thats tuff. Is the motor stock?
     

    1K  0

    1996 Mitsubishi Eclipse N/T
    manual · 2G DSM
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    VelocitàPaola likes this.
  3. jayson427

    jayson427 Proven Member

    1,403
    2
    Joined Dec 20, 2011
    Mesa, Arizona
    I just seen your mods 220 psi on compression for 8.8:1 is alot I think. I had 230 but im running 10.5:1. all I can think of is the wiring needs to be double checked. Or try a different ecu if you have one. do you know your oil pressure or fuel pressure? What kind of gap are you running on your spark plugs?
     

    1K  0

    1996 Mitsubishi Eclipse N/T
    manual · 2G DSM
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  4. tumbler

    tumbler Probationary Member

    25
    0
    Joined Feb 15, 2006
    Sicklerville, New Jersey
    the motor is bored .020 over. crank is polished. dished valve relief pistons. mls head gasket, arp studs. have upgraded fuel system, walbro.
     

    Street Build 254  1

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM
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