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93 Carry DD51T Carb Tuning

Discussion in 'Suzuki Carry' started by Cole, Aug 6, 2017.

  1. Cole

    Cole Member

    Hey awesome! No problem. Glad it helped you. If everybody can contribute something we all will benefit!
  2. milmor88

    milmor88 Member

    Great write up i have attached some diagrams and such that i found to be helpful, as well as a picture showing the actuators as well as what they do and finally an diagram to show the diff between 2+3 and 3+2

    Attached Files:

  3. KCCats

    KCCats Member

    So have we ever found the best place and price on the parts themselves?
  4. dalez0r

    dalez0r New Member

    milmor88, what's that black line off the manifold right in front of the carb going to?

    I'm drawing up diagrams for the 94 Scrum Van to share, once I get it all sorted :D
  5. rugerman

    rugerman Bronze Supporting Member

    Are you referring to those carb coolant lines?
  6. milmor88

    milmor88 Member

    Which one are you refering to and which picture...the photos I found online but I shared it here
  7. dalez0r

    dalez0r New Member

    milmor88: in the "vacuum lines overview" pic, black line going to a union in the intake manifold directly left of the alternator and north of the carb, oriented north-south. The nipple/union itself is hidden under the black/gray line running east/west to the thermo switch. It's definately a vacuum line.
  8. dalez0r

    dalez0r New Member

    Still trying to figure out my 4wd van. I suspect that union is either for the 4wd or the airbox hot air flap system. Leaning towards airbox. Can anyone confirm?
  9. dalez0r

    dalez0r New Member

    ^^ 99% sure that union is connected to the airbox hot idle compensator now, which lets extra air into the engine to lean it out when the fuel in the carb is hot and running rich. The 4wd is connected to the fast idle circuit's vac supply, and works now! woohoo!

    See my "1994 Every/Scrum van w/AC and part time 4wd vacuum diagram" thread in the Microvans subforum to see the master vac diagram I put together for these vans.

    I'm 99% sure I got it right, BUT it's not quite working right on my van. As soon as I start the engine the fast idle actuator pulls up even though everything is turned off and the engine cold. I disconnect the cables to the two vacuum valves, and it still pulls it up w/ vacuum coming from BOTH valves, so I'm guessing when no power is applied to them they default to passing vacuum. Any ideas how to troubleshoot the fast idle circuit??
  10. VanOne

    VanOne Member

    Have you tried pulling the wire from the fast idle relay that is under the dash(based on parts Diagram I'm fairly certain you can reach it by hand) to see if the actuator stops pulling up? If it does, you have a faulty relay.

    I had a 1995 Every where that relay, the place where it is supposed to be screwed on, and the wiring was removed and the actuator did nothing due to not getting power. It moving when no accessories are on would indicate the relay is not functioning correctly.
    Last edited: Jan 29, 2019
  11. dalez0r

    dalez0r New Member

    Well, I'm assuming those vacuum valves are normally open, because even with power disconnected from the two valves I'm getting vacuum from both of them, so pulling the relay would not change anything that that did not accomplish... The system DID work before I fixed other parts of the vac system, but I've got it plumbed according to this diagram and I'm not sure what's going on:

    Attached Files:

  12. milmor88

    milmor88 Member

    Hey just replacing a carb now and the small line from the manifold direct downstream of carb goes to a tee which then goes into the airbox right beside where it connects to the boot that goes to carb, and the other part of tee goes to the forward airbox vac. Line nipple on bottom of airbox. Back bottom nipple on airbox connects to the warm air actuator thing which i have removed and therefore capped. The line off the intake came off on mine today couldnt figire out why it couldnt idle and dipped in rpm randomly on way to work. It also had a hell of a time starting...backfired so loud it was like a 12 ga.
  13. SDK1968

    SDK1968 Member

    can anyone tell me where this #6 screw is? i cant find it.... the pictures Cole has posted here isnt exactly how my carb looks...

    manual hasnt shown up yet.

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