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Thread: 3.0L engine swap

  1. #571
    Administrator Ron's Avatar
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    Quote Originally Posted by Farrar View Post
    I decided to fire up the engine and tune the idle mixture: I set the screws out 1.75 turns as a cursory "enough to get started" position, then cranked.
    Base setting for a 2150 is 1.50 turns out...

    Quote Originally Posted by Farrar View Post
    "enough to get started" position, then cranked.

    And cranked.

    And cranked.
    If it starts and instantly dies, it could be the mixture screw settings. But since it just cranks and cranks, I'd suggest you look elsewhere... Whether they are all the way in or all but removed, it should fire off. (The setting has virtually nothing to do with cranking or running when off idle.)

    Quote Originally Posted by Farrar View Post
    By now I figured the engine was flooded, so I propped the choke plate open with a 3/8" drill bit and cranked again..
    The engine must be warm when setting the screws, so the choke should have been fully open...

    =======

    I agree it is probably flooded now...Pull a few of the easy to get to plugs and see what they look like. If they look OK, look for a vacuum leak. (Possibly cross-wired?).

  2. #572
    Owner since 2007 Farrar's Avatar
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    Quote Originally Posted by Ron View Post
    Base setting for a 2150 is 1.50 turns out...
    Thanks, I'll lean the mixture a full turn before trying again.

    Quote Originally Posted by Ron View Post
    (Possibly cross-wired?).
    Ron wins! I had wires 3 and 2 reversed at the cap. I can be a real doofus sometimes...

    So yes, I propped the choke open and held the throttle, and cranked until the engine caught. Then I revved the engine until the extra fuel was gone, waited until the engine was warmish, and set the idle mixture.

    Then I went on a test drive. Much better: the misfire is gone!
    3.0L, automatic, carbureted

  3. #573
    Not a DeLorean Guru
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    That makes me so happy that I will let you buy me a donut.
    -Mike

    My engine twists my frame.

    1981 DeLorean, Carb LS4 swap completed
    1999 Corvette, cam/headers/intake manifold, 400 rwhp
    2005 Elise, stock
    2016 Chevy Cruze

  4. #574
    Owner since 2007 Farrar's Avatar
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    Quote Originally Posted by opethmike View Post
    That makes me so happy that I will let you buy me a donut.
    With that LS engine in the back, you can probably use your DMC to make donuts.

    ... Moving on ...

    The coolant looks a bit mucky. I think I will flush it again, and also start using the DMC to drive to and from work (less than five miles each way and no highway driving) because it has been badly neglected these past few months and the brand-new tires have flat spots in them already. :P
    3.0L, automatic, carbureted

  5. #575
    Not a DeLorean Guru
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    Slowly but surely getting there! Solving this misfire is a huge step. I personally would still go ahead and replace the remaining wires if you haven't done so already.
    -Mike

    My engine twists my frame.

    1981 DeLorean, Carb LS4 swap completed
    1999 Corvette, cam/headers/intake manifold, 400 rwhp
    2005 Elise, stock
    2016 Chevy Cruze

  6. #576
    Administrator Ron's Avatar
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    Quote Originally Posted by Farrar View Post
    Thanks, I'll lean the mixture a full turn before trying again.
    1.75 - 1.50 = 0.25 turns...

  7. #577
    Not a DeLorean Guru
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    He said a full turn ron!!!!!!!!
    -Mike

    My engine twists my frame.

    1981 DeLorean, Carb LS4 swap completed
    1999 Corvette, cam/headers/intake manifold, 400 rwhp
    2005 Elise, stock
    2016 Chevy Cruze

  8. #578
    Administrator Ron's Avatar
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    Huh?

  9. #579
    Owner since 2007 Farrar's Avatar
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    Quote Originally Posted by Farrar View Post
    Two and a half turns out, no start.
    Quote Originally Posted by Ron View Post
    Base setting for a 2150 is 1.50 turns out...
    Quote Originally Posted by Farrar View Post
    Thanks, I'll lean the mixture a full turn before trying again.
    2.5 - 1 = 1.5
    3.0L, automatic, carbureted

  10. #580
    Owner since 2007 Farrar's Avatar
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    Quote Originally Posted by opethmike View Post
    I personally would still go ahead and replace the remaining wires if you haven't done so already.
    You mean the remaining boots, right? The wires are fine, but I have had to replace two plug boots already. I have plenty of silicone spray so I may just do the other four this weekend.
    3.0L, automatic, carbureted

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