1. Join the Community!

    DSMtuners is a massive archive of DSM information - but more importantly, it's a COMMUNITY! Join in and participate with other DSMers, and invite all of your DSM friends to make this place their home. Chat with others, create a build thread, post questions and answers. Get involved! Logging in will also remove many of the advertisements, along with this notice. ;)

Idle and revving issues. Blow-by symptoms still.

Posted by BLACK'98DSM, Sep 7, 2019

Please Support Morrison Fabrications
Please Support STM Tuned
  1. BLACK'98DSM

    BLACK'98DSM Proven Member

    2,325
    690
    Joined Feb 9, 2019
    Hoover, Alabama
    Let me start by noting everything I've done, because I know you will tell me to do these things first:
    - Compression tested, I have great compression (up to 182 psi)
    - PCV valve replaced
    - TPS replaced
    - Checked for vacuum leaks
    - Checked tension in the throttle cable


    So here's my issue:
    - Idle surge (down to 700, back up to 1000)
    - While driving, when I push the clutch in, the rpms go to 2000, fall down to 1200, then rise back up to a steady 1700. Putting the car in nuetral makes no difference. When the car is in motion it will idle there forever. But as soon as the car comes to a complete stop the rpms go back down to idle (still surging of course).
    - And I am still experiencing blow by symptoms

    I'm thinking the IAC? What do you think?
     

    Road Race Build 4K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    72  6

    1998 Ford Mustang GT
    rwd · manual · Misc Vehicles
    Loading...
  2. ThunderChild

    ThunderChild Supporting VIP

    3,748
    1,096
    Joined Jan 5, 2012
    Rathdrum, Idaho
    Sounds like a logical conclusion, I can't recall if you can adjust the TPS on the 420a, but that's be my only other guess besides a vacuum leak.
     

    Street Build 965  3

    1990 Plymouth Laser N/T
    fwd · manual · 1G DSM

    900  8

    1987 Toyota Pickup/Hilux
    awd · manual · Misc Vehicles

    Street Build 1K  7

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

    2K  0

    1992 Eagle Talon TSi AWD
    manual · 1G DSM

    Street Build 3K  10

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
    Loading...
  3. BLACK'98DSM

    BLACK'98DSM Proven Member

    2,325
    690
    Joined Feb 9, 2019
    Hoover, Alabama
    This problem just started this morning. I replaced the TPS a few months back.

    Oddly enough this started immediately after I replaced the PCV valve. I don't see a correlation here but that is weird.
     

    Road Race Build 4K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    72  6

    1998 Ford Mustang GT
    rwd · manual · Misc Vehicles
    Loading...
  4. wrencher

    wrencher Proven Member

    360
    40
    Joined Nov 20, 2005
    Chicago, Illinois
    Block the PCV hose temporarily to see if it alleviates your idle issues.
    If the last thing done causes a concern it should be your first suspect.

    New doesn't always mean good.
     
    BLACK'98DSM and Mello like this.
  5. Vegas Smith

    Vegas Smith Proven Member

    4,033
    1,884
    Joined Dec 2, 2002
    Houston, Texas
    Did you accidentally unplug the isc? This happens when I do that...
     

    Street Build 4K  4

    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
    Loading...
  6. BLACK'98DSM

    BLACK'98DSM Proven Member

    2,325
    690
    Joined Feb 9, 2019
    Hoover, Alabama
    No, but maybe it's bad?
     

    Road Race Build 4K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    72  6

    1998 Ford Mustang GT
    rwd · manual · Misc Vehicles
    Loading...
  7. Cherry

    Cherry Proven Member

    242
    52
    Joined Jun 16, 2019
    Hull, Georgia
    If you think it might be the ISC im sure there is a way to test it for the 420a before you go out and buy a new one. I dont know how to test it though but I would look into it if you think its a good candidate for causing your issue.
     

    Street Build 381  3

    1991 Mitsubishi Eclipse N/T
    fwd · manual · 1G DSM
    Loading...
  8. BLACK'98DSM

    BLACK'98DSM Proven Member

    2,325
    690
    Joined Feb 9, 2019
    Hoover, Alabama
    I oredered and IAC valve and a MAP sensor since mine are stock. I also decided that I will put my stock PCV valve back on since it seemed just fine. The above should fix the idle and accelerating issues.

    But I still don't know what I should do about my dipstick still popping out.
     

    Road Race Build 4K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    72  6

    1998 Ford Mustang GT
    rwd · manual · Misc Vehicles
    Loading...
    609DSM likes this.
  9. 609DSM

    609DSM Proven Member

    370
    148
    Joined Aug 13, 2019
    Langhorne, Pennsylvania
    The tps is not adjustable on the 420a motor.
     

    Street Build 315  3

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    Street Build 436  1

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
    Loading...
    BLACK'98DSM likes this.
  10. BLACK'98DSM

    BLACK'98DSM Proven Member

    2,325
    690
    Joined Feb 9, 2019
    Hoover, Alabama
    I thought so.
     

    Road Race Build 4K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    72  6

    1998 Ford Mustang GT
    rwd · manual · Misc Vehicles
    Loading...
    609DSM likes this.
  11. 609DSM

    609DSM Proven Member

    370
    148
    Joined Aug 13, 2019
    Langhorne, Pennsylvania
    My dipstick pops out too. I've read you have a rebuilt engine. Mine doesnt have oil spit out from it from what I've been able to see. I've looked it up a little bit, some people say to clamp the top of the stem to hold it into place. I'm wondering if just from all the heat over the years my rubber on the stick is worn and also in conjunction the metal tube has permanently warped. Still not sure on that one.
     

    Street Build 315  3

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    Street Build 436  1

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
    Loading...
  12. BLACK'98DSM

    BLACK'98DSM Proven Member

    2,325
    690
    Joined Feb 9, 2019
    Hoover, Alabama
    Neither does mine. Gladly LOL.

    Most likely. As far as I know my dipstick is stockLOL Maybe I can find a decent aftermarket one to buy and maybe I will try clamping it down. I just bought some header wrap so I think that will help with a good bit of my engine bay issues.
     

    Road Race Build 4K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    72  6

    1998 Ford Mustang GT
    rwd · manual · Misc Vehicles
    Loading...
    609DSM likes this.
  13. 609DSM

    609DSM Proven Member

    370
    148
    Joined Aug 13, 2019
    Langhorne, Pennsylvania
    I decided against permanently doing anything to the dipstick to for now. I just let my guy rock out for the time being, doesnt effect my mpg or my oil consumption which I've been monitoring lately. Have a worn oil plug gasket I need to replace cause I forgot to get one and idk how many times the poor thing has been reused cause I don't know who owned my car previously. But the gasket should fix my oil problem. Pretty sure I don't burn much oil if any at all.
     

    Street Build 315  3

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    Street Build 436  1

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
    Loading...
  14. BLACK'98DSM

    BLACK'98DSM Proven Member

    2,325
    690
    Joined Feb 9, 2019
    Hoover, Alabama
    How many miles are on yours?
     

    Road Race Build 4K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    72  6

    1998 Ford Mustang GT
    rwd · manual · Misc Vehicles
    Loading...
    609DSM likes this.
  15. 609DSM

    609DSM Proven Member

    370
    148
    Joined Aug 13, 2019
    Langhorne, Pennsylvania
    181k :( no clue what's been done to it. Has some misplaced bolts so some kind of looking around/maintenance has been done but haven't taken things apart to look around cause it's my only car right now.
     

    Street Build 315  3

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    Street Build 436  1

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
    Loading...
    BLACK'98DSM likes this.
  16. BLACK'98DSM

    BLACK'98DSM Proven Member

    2,325
    690
    Joined Feb 9, 2019
    Hoover, Alabama
    @609DSM

    Looking at your picture, it appears you have the exact same dent in the lower center of the front bumper that I had. That must be a very common problem among the Eclipses.

    open_hood .jpg


    I took that picture before I replaced the bumper and started painting. You can see it down there! LOL
     

    Road Race Build 4K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    72  6

    1998 Ford Mustang GT
    rwd · manual · Misc Vehicles
    Loading...
    609DSM likes this.
  17. 609DSM

    609DSM Proven Member

    370
    148
    Joined Aug 13, 2019
    Langhorne, Pennsylvania
    Yeah LOL and the indent where the Mitsubishi logo goes haha. This car has seen better days but the engine is running well and the transmission is smooth as butter so I'm doing what I can to keep it alive. Has some cosmetic/comfort issues but it gets me from point a to point b so I couldn't be more grateful. Plus I'm learning so much about the dsm platform, I'll be ready for the 4g63 when that day comes.
     

    Street Build 315  3

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    Street Build 436  1

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
    Loading...
    BLACK'98DSM likes this.
  18. BLACK'98DSM

    BLACK'98DSM Proven Member

    2,325
    690
    Joined Feb 9, 2019
    Hoover, Alabama
    @609DSM

    I see that your headlights are looking a little yellow. You can wet sand with 400, 600, 800, 1000, 1500 then rattle can some clear on top to restore them. You'll be in about $20

    Or if you want a longer lasting solution you can save a little extra and buy THESE
     

    Road Race Build 4K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    72  6

    1998 Ford Mustang GT
    rwd · manual · Misc Vehicles
    Loading...
    609DSM likes this.
  19. 609DSM

    609DSM Proven Member

    370
    148
    Joined Aug 13, 2019
    Langhorne, Pennsylvania
    Yeah I saw how chris fix did his headlights and it looks pretty legit. Honestly was looking at headlights today but since I went to a used dealer for this car it has 4 different tires with all different wear on them. I need to get new tires ASAP! But with scrapping by cause it's so slow at my job and going to school ita hard for me to even do much to my car. Picked up some new spark plugs today, started raining bout to finish changing them out. Those headlights look pretty legit for 75 I really wanna snag a pair. I also have this damn p0455 code I cant figure out, pretty sure it's a line cause my gas cap doesnt look too old and it's an aftermarket so idk... so much to do, so little money right now :D
     

    Street Build 315  3

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    Street Build 436  1

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
    Loading...
  20. BLACK'98DSM

    BLACK'98DSM Proven Member

    2,325
    690
    Joined Feb 9, 2019
    Hoover, Alabama
    I can send you a perfectly fine gas cap if you want, I pulled it off because I thought it was causing a code but it wasn't.
     

    Road Race Build 4K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    72  6

    1998 Ford Mustang GT
    rwd · manual · Misc Vehicles
    Loading...
    609DSM likes this.
  21. 609DSM

    609DSM Proven Member

    370
    148
    Joined Aug 13, 2019
    Langhorne, Pennsylvania
    That would be dope. See if that's the issue or not. I just haven't bothered getting one honestly. I replaced the purge valve but nothing changed and light still came on. Usually takes about 100+ miles of dd for it to come back. I really think it could be the gas cap? Idk, evap leaks suck
     

    Street Build 315  3

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    Street Build 436  1

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
    Loading...
  22. BLACK'98DSM

    BLACK'98DSM Proven Member

    2,325
    690
    Joined Feb 9, 2019
    Hoover, Alabama
    Agreed, I have p1494. Soon I will delete the whole Evap system, weight reduction and better performance.

    I can send you the cap for $8 shipped. I take Paypal payment. Pm me with your info if you're interested.
     
    Last edited: Sep 9, 2019

    Road Race Build 4K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    72  6

    1998 Ford Mustang GT
    rwd · manual · Misc Vehicles
    Loading...

Share This Page

Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Feal Suspension Fuel Injector Clinic Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications OHM Racing Raven Fabrication RixRacing RockAuto RTM Racing SouthBay Fuel Injectors STM Tuned Track Decals Track Sculptures VR Speed Factory