Q-Jet part throttle lean condition

Discussion in 'The Venerable Q-Jet' started by buick64203, Sep 24, 2017.

  1. Aaron65

    Aaron65 Well-Known Member

    I don't think you can assume it'll run at the same AFR at cruise that it does at idle. Nothing I own works that way; it's usually leaner at cruise than it is at idle.
     
    Last edited: Oct 11, 2017 at 4:40 PM
  2. Daves69

    Daves69 Too many cars too work on

    Where did you get your kit? I have been thinking about this for a while and have a couple of vehicles that need some fine tuning.
     
  3. buick64203

    buick64203 Buick Hunter Staff Member

    I got it off Ebay. The basic kit was like $220 and came with an 8 foot cable and a weld in bung. I had to buy the 18 foot cable and the tailpipe adapter separately. The standard 8 foot cable wouldn't reach from the tailpipe to my front seat
     
  4. Daves69

    Daves69 Too many cars too work on

  5. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    Jason, see if the power piston is staying down at idle. Put a screw driver down the vent with the engine off. See if you can feel the piston go down, then spring back up. Then start the engine and put that same screw driver on top of the piston. Wing the throttle quickly and see if the screw driver pops up.

    powerpistQjet.jpg
     
  6. buick64203

    buick64203 Buick Hunter Staff Member

    Dave, this is the tailpipe clamp. Innovate Motorsports #3728

    http://www.ebay.com/itm/Innovate-Ex...ash=item4650f7d112:g:dVIAAOSw5HJXKotU&vxp=mtr

    And this is the meter kit I bought-

    http://www.ebay.com/itm/Innovate-LM...m3f17a8921b:m:mEkeQMT0dbwOaGBnmVc0FMg&vxp=mtr

    And the 18 foot cable-

    http://www.ebay.com/itm/Innovate-Mo...ash=item3613a34679:g:yMUAAOSwTM5Yt5Kn&vxp=mtr

    Its gets a little pricey but this way it becomes a tool in your toolbox and can be put on any car your working on

    Yep, did that one both carbs.
     
  7. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    Are you sure the jetting is stock? Could someone have messed with it before you?
     
  8. buick64203

    buick64203 Buick Hunter Staff Member

    Who the hell knows. I don't even remember how the Riviera wound up with a Stage 1 carb on it. I didn't know I had one. I have to open it up and find out
     
    techg8 likes this.
  9. buick64203

    buick64203 Buick Hunter Staff Member

    Ok, more results...

    Seems to idle now at 14.2-14-5. Pretty sure I can richen that up a little. Cruise seems to be about 12.9. So assuming the stock jets are in there, what rods do I install?
     
  10. wkillgs

    wkillgs Gold Level Contributor

    You need to check the ratio at WOT before thinking about changing rods.
     
  11. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    You need to verify the jetting is stock. Who knows what is in there.
     

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