Results 1 to 23 of 23

Thread: Tuning a 2.6L

  1. #1

    Array
    Status
    Offline
    Join Date
    03-26-2011
    Posts
    112
    Location

    Rock Hill, SC
    Vehicle

    1995 Mitsubishi Mighty Max
    Engine

    4G64

    Tuning a 2.6L

    I have 1989 MM 2.6L 5 Speed Just attached a Weber 34 DGEC Progressive Carb. I have replaced the Fuel Filter next to the tank and plugs, wires, cap, & rotor. It idles a bit rough and when I press the gas pedal it stalls,skips,and pops back and until full throttle then it runs great but just for pulling off from the drive way it just dont do nothing but pop and skip. Anything I need to do please help! Any comments are welcome and take a look at the pics and see if I did sumfin wrong or I need to change something.

    DSCN2235A.jpg
    DSCN2237A.jpg
    DSCN2238A.jpg
    DSCN2241A.jpg
    DSCN2247A.jpg

  2. #2

    Array
    Status
    Offline
    Join Date
    03-26-2011
    Posts
    112
    Location

    Rock Hill, SC
    Vehicle

    1995 Mitsubishi Mighty Max
    Engine

    4G64
    distributor has not been moved out of its original position.

  3. #3



    Array
    Status
    Offline
    Join Date
    03-16-2011
    Posts
    3,814
    Location

    Sacramento, CA
    Vehicle

    1979 Dodge D-50
    Engine

    Chevy V6
    What is the timing set at. I would bet it's too advanced. Try retarding the timing just a bit and then readjust the carb. How many turns out is the mix screw? Also if you look at the manual that came with it there should be a trouble shooting guide. If not look in the manual section for my first gen manual. There is a weber guide in there also.
    Members come and members go, But the board keeps track of them.
    Find me on FaceBook
    clicking HERE.

    Or look on YouTube Click Here.
    http://mobilemillwright.com

  4. #4

    Array
    Status
    Offline
    Join Date
    03-26-2011
    Posts
    112
    Location

    Rock Hill, SC
    Vehicle

    1995 Mitsubishi Mighty Max
    Engine

    4G64
    I have no idea what the timing is set at its stock i guess lol i heard to turn the mix screw 1 1/2 turns out and back 1/2 turn form a friend of mine but i dont know if it is true or not and when i turn the mix screw in it accelerates is that even right? I will look in my chilton manual and see.

  5. #5




    Array
    Status
    Offline
    Join Date
    03-20-2011
    Posts
    4,857
    Location

    Pittsburgh, PA
    Vehicle

    1980 Dodge D-50
    Engine

    G54B
    Sounds like you are turning the idle screw - if it was the mixture screw, turning it in will lean it out and slow it down, not speed it up. It also looks like you may have the vacuum advance hooked to full vacuum, not ported vacuum. Ported vacuum is above the throttle plate; the port you have it hooked to is at the throttle plate - it will cause full advance at idle, and drop off at WOT. Find the ported vacuum port and hook the vac advance there, then cap the port you were using.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  6. #6

    Array
    Status
    Offline
    Join Date
    03-26-2011
    Posts
    112
    Location

    Rock Hill, SC
    Vehicle

    1995 Mitsubishi Mighty Max
    Engine

    4G64
    The only ports I see and is available is the vac tree on the intake as you see are capped with vac lines looped over and the carburetor only has that port that the distributor is connected to. Should I connect the distributor to one of those ports on the vac tree on the intake and cap the carburetor port on the carburetor? what is a WOT?
    Last edited by tekjones83; 09-04-2011 at 07:45 PM. Reason: had another question

  7. #7




    Array
    Status
    Offline
    Join Date
    03-20-2011
    Posts
    4,857
    Location

    Pittsburgh, PA
    Vehicle

    1980 Dodge D-50
    Engine

    G54B
    Give me until tomorrow to pull out my weber manuals to figure out was ports that carb has. WOT is wide open throttle. That carb is an emissions carb and should have more ports on it, but I need my manuals to be sure.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  8. #8

    Array
    Status
    Offline
    Join Date
    03-26-2011
    Posts
    112
    Location

    Rock Hill, SC
    Vehicle

    1995 Mitsubishi Mighty Max
    Engine

    4G64
    Thank you and cant wait lol sorry noob to my weber carb hahaha

  9. #9




    Array
    Status
    Offline
    Join Date
    03-20-2011
    Posts
    4,857
    Location

    Pittsburgh, PA
    Vehicle

    1980 Dodge D-50
    Engine

    G54B
    Here is an install manual on the carb - it appears that is the vacuum advance port, but it seems that getting the port to work right may be tricky: http://www.racetep.com/weber/INS-WK601-34.pdf . There is a ton of info on the jeep forums about this carb and how hard it is to get tuned right. Also, this carb is not made any more, but jets and parts are still available.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  10. #10

    Array
    Status
    Offline
    Join Date
    03-26-2011
    Posts
    112
    Location

    Rock Hill, SC
    Vehicle

    1995 Mitsubishi Mighty Max
    Engine

    4G64
    Thank you and everybody for all the help this is the best site ever and keep up the great work and keep me posted if anybody finds out anything.

  11. #11

    Array
    Status
    Offline
    Join Date
    03-26-2011
    Posts
    409
    Location

    Portland, OR
    Vehicle

    1986 Dodge Power Ram 50
    Engine

    G54B
    Stock timing I think was either 7.5 or 8.5 degrees before top dead center. You should probably be in the 9-10 degree range. Best way to find out is just play with it.

  12. #12

    Array
    Status
    Offline
    Join Date
    03-26-2011
    Posts
    112
    Location

    Rock Hill, SC
    Vehicle

    1995 Mitsubishi Mighty Max
    Engine

    4G64
    Yea That sounds right and I did play with it lol I got it close enough to where I got my gas mileage back and performing. Thanks

  13. #13

    Array
    Status
    Offline
    Join Date
    03-26-2011
    Posts
    112
    Location

    Rock Hill, SC
    Vehicle

    1995 Mitsubishi Mighty Max
    Engine

    4G64
    Does anybody know what the Vacuum PSI on a 2.6L? I heard you can tune a engine by a vacuum gauge?

  14. #14


    Array
    Status
    Offline
    Join Date
    06-17-2011
    Posts
    193
    Location

    Portland, OR
    Vehicle

    1986 Mitsubishi Mighty Max
    Engine

    Chevy V6
    You use a vacuum gauge to set the idle mixture on the carburetor. not sure how much vacuum our trucks have?

    http://www.allpar.com/fix/carb-tuning.html

  15. #15

    Array
    Status
    Offline
    Join Date
    03-26-2011
    Posts
    112
    Location

    Rock Hill, SC
    Vehicle

    1995 Mitsubishi Mighty Max
    Engine

    4G64
    Thank you it helped

  16. #16

    Array
    Status
    Offline
    Join Date
    04-28-2011
    Posts
    111
    Location

    Lewistown, PA
    Vehicle

    1984 Dodge Power Ram 50
    Engine

    Dodge V8
    Quote Originally Posted by Rickdees View Post
    You use a vacuum gauge to set the idle mixture on the carburetor. not sure how much vacuum our trucks have?

    http://www.allpar.com/fix/carb-tuning.html
    On a fresh 2.6L (stock rebuild) in one of my old trucks, it had 23" of Vacuum at an idle. On a older engine with some miles, maybe 19 - 20" of vacuum. A higher mileage engine, 15" or so.

  17. #17

    Array
    Status
    Offline
    Join Date
    03-26-2011
    Posts
    112
    Location

    Rock Hill, SC
    Vehicle

    1995 Mitsubishi Mighty Max
    Engine

    4G64
    Sweeetnesss

  18. #18

    Array
    Status
    Offline
    Join Date
    04-28-2011
    Posts
    111
    Location

    Lewistown, PA
    Vehicle

    1984 Dodge Power Ram 50
    Engine

    Dodge V8
    Also, low vacuum is common on radical engines too. The 340 Small Block in my '74 Duster only builds about 12" of vacuum at an idle (and that's a brand new radically built engine)

  19. #19

    Array
    Status
    Offline
    Join Date
    11-15-2011
    Posts
    8
    Location

    Advance NC
    Vehicle

    1989 Dodge Power Ram 50
    im sorry for bringing up this tread form way back..... i have the same problem with my '89 shutting off, however my mechanical fuel pump has 3 nipples and one is capped off, thats how it was when i got it. Is there a reason why? It looks new, Also can i get rid of all the vacum lines except for the ign advancer now that i have a weber carb?

  20. #20




    Array
    Status
    Offline
    Join Date
    03-20-2011
    Posts
    4,857
    Location

    Pittsburgh, PA
    Vehicle

    1980 Dodge D-50
    Engine

    G54B
    The capped fitting on the manual pump goes to the return line to the tank. As for the vacuum lines, only the vac advance and the booster hoses are needed to run with a Weber.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  21. #21

    Array
    Status
    Offline
    Join Date
    11-15-2011
    Posts
    8
    Location

    Advance NC
    Vehicle

    1989 Dodge Power Ram 50
    Thank you!!!! so i can disconnect all the other vacum hoses for the exception of the vac advancer and the break booster?

  22. #22



    Array
    Status
    Offline
    Join Date
    03-26-2011
    Posts
    1,507
    Location

    Vacaville, CA
    Vehicle

    1989 Mitsubishi Mighty Max
    Engine

    4G63-T
    Yes you can
    Josh
    09 BMW 335i E92 Twin turbo
    89 Macrocab 4g63 Turbo swapped & Bagged: Build Thread

  23. #23

    Array
    Status
    Offline
    Join Date
    11-15-2011
    Posts
    8
    Location

    Advance NC
    Vehicle

    1989 Dodge Power Ram 50
    i changed it sorry about that!!!!

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •