Author Topic: 1985 RC 318 With Lean Burn California Smog  (Read 1645 times)

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Offline thegrid22593

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Re: 1985 RC 318 With Lean Burn California Smog
« Reply #50 on: April 10, 2020, 12:21:10 am »
there IS a vacume choke "pull off" can the brings you rpm down when you blip the throttle , BUT it does so ONLY so much ,( sounds like that IS working) then the bimetal choke "stove" brings it down the rest of the way as it warms . What you discribe tells me that the choke is closed TOO much , after you blip it , its getting TOO little air for the amount of choke and it begins to "load up" blows black smoke and chugs . Adjust the choke rod so it is less closed . It can be tricky because you only get 1 chance each time , because the motor has to FULLY cool before you can try again . Shops were forced to keep customers autos over night in order to adjust a choke properly ..  After it is fully warmed check that the choke plate is vertical/wide open , a partly closed choke will BLOW every smog test ..

Thanks Dodge,

Yes the choke pull off and choke stove work, infact both of those parts are brand new.

I attached a couple photos of the carb, if I have my parts correct, the arm going down to the manifold is the choke stove and the pull off is the gold diaphragm looking thing on the left. Is the choke Rod the linkage between pull off and the stove arm or is it the other side connected to the cam? Which color arrow?




1985 RC 150LE 4X4 318 | 727A

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    Offline dodge82273

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    Re: 1985 RC 318 With Lean Burn California Smog
    « Reply #51 on: April 10, 2020, 03:27:04 am »
    you have your parts correctly identified . The green arrow side, the s shape goes to the pull off , the straight rod going down to the "stove" is the one that needs adjusting . If you look at the choke plate , you see that its fully closed , maybe tightly even . I don't know how to draw on this puter like you did , but the straight rod , needs a zig zag bent into it , 2 pliers , you don't want the bottom end to drag on the tin there, but you want to shorten that rod
    it will likely end up looking vertical as it enters the "stove" .. this should open the plate some more after bliping the gas then it does now . Perhaps post a pix of the cold engine running after you have blipped it and the choke pull off pulled it off a little ?   I'm assuming this pix is cold not running , not blipped ... full choke is only good untill it starts THEN it HAS to open some , warm it must be   FULLY     open .
    78 to 93 parts trucks
    91 w250 318 518 44/60 single 9 foot driveway plow locked
    87w150 44/corp727 kandy w/ ghost bats/summer
    86-D/W100 44/corp/318mag/carb/4500/aka shit box/winter
    93w150short/44/corp/360/le/mag "caddie"
    93w250LB51844/60posi 318"New Truck"
    93w350 6 tire CC 60 c/a flat bed dump

    Offline thegrid22593

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    Re: 1985 RC 318 With Lean Burn California Smog
    « Reply #52 on: April 10, 2020, 01:02:16 pm »
    you have your parts correctly identified . The green arrow side, the s shape goes to the pull off , the straight rod going down to the "stove" is the one that needs adjusting . If you look at the choke plate , you see that its fully closed , maybe tightly even . I don't know how to draw on this puter like you did , but the straight rod , needs a zig zag bent into it , 2 pliers , you don't want the bottom end to drag on the tin there, but you want to shorten that rod
    it will likely end up looking vertical as it enters the "stove" .. this should open the plate some more after bliping the gas then it does now . Perhaps post a pix of the cold engine running after you have blipped it and the choke pull off pulled it off a little ?   I'm assuming this pix is cold not running , not blipped ... full choke is only good untill it starts THEN it HAS to open some , warm it must be   FULLY     open .

    Hey Dodge, yes you are correct that photo is cold not running. I will do some before after photos today when I get a chance on on the engine cold vs cold and bliped. I'll see if I can even get a video of the whole thing so you can watch the process.
    1985 RC 150LE 4X4 318 | 727A

    Offline thegrid22593

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    Re: 1985 RC 318 With Lean Burn California Smog
    « Reply #53 on: April 12, 2020, 07:28:13 pm »
    Alright, finally got around to getting some photos of the different stages here.

    I'll do three separate replies to organize accordingly, this first reply has three photos of not running cold. Hasn't been started in over 24 hours.



    1985 RC 150LE 4X4 318 | 727A

    Offline thegrid22593

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    Re: 1985 RC 318 With Lean Burn California Smog
    « Reply #54 on: April 12, 2020, 07:30:19 pm »
    This reply is cold and just started, so choke pull off brings the choke open slightly.

    1985 RC 150LE 4X4 318 | 727A

    Offline thegrid22593

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    Re: 1985 RC 318 With Lean Burn California Smog
    « Reply #55 on: April 12, 2020, 07:36:08 pm »
    These next three links are videos

    1st video: Running at fast idle, haven't blipped the throttle at all. Idle is high but smooth

    https://www.dropbox.com/s/whadr3xpzm39bc8/fast-idle.mov?dl=0

    2nd video: Blipped throttle and stall ( this happens quite a lot, usually starts right up again and runs like third video)

    Dodge, I think this is what you were talking about for when I blip the throttle I can see the choke opens just a bit more but you were saying its not enough? Does that look suspect here? Barely opens more.

    https://www.dropbox.com/s/3c3xp8mmoik52pp/blip-gas-stall.mov?dl=0

    3rd Video: After blipped throttle and running, you can see and hear when it misses cause the air cleaner threads pole will shake and you can hear the rpms change.

    https://www.dropbox.com/s/teklv093hoh74kn/bliped-gas-running.mov?dl=0
    « Last Edit: April 12, 2020, 07:40:24 pm by thegrid22593 »
    1985 RC 150LE 4X4 318 | 727A

    Offline KurtfromLaQuinta

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    Re: 1985 RC 318 With Lean Burn California Smog
    « Reply #56 on: April 12, 2020, 11:08:33 pm »
    That carburetor looks like it came off a Briggs and Straton.  ;)
    « Last Edit: April 14, 2020, 06:57:43 pm by KurtfromLaQuinta »
    500 c.i.- Scat Crank, Scat Rods, Indy Aluminum heads, Comp XR280HR Cam, Six-Pack, Milodon 8 qt. Pan, 727  (reverse-manual, low band apply, 5 clutch disc, 3 qt. xtra. pan), N.P. 205, Ford 9" rear axle (4:11, 31 spline axles, Detroit Locker, converted/ disc brakes). Dana 44 front (converted/ disc, 4:10, Tru-Trac limited slip). Hydra Boost Brake Booster, Gear Vendors OD. 600+ ft. lbs. of torque

    Offline thegrid22593

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    Re: 1985 RC 318 With Lean Burn California Smog
    « Reply #57 on: April 13, 2020, 01:17:22 am »
    That carburetor looks like it came off a Briggs and Stratton.  ;)

    Hahaha yea
    1985 RC 150LE 4X4 318 | 727A

    Offline dodge82273

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    Re: 1985 RC 318 With Lean Burn California Smog
    « Reply #58 on: April 13, 2020, 02:43:17 am »
    na... its a 2 barrel
    78 to 93 parts trucks
    91 w250 318 518 44/60 single 9 foot driveway plow locked
    87w150 44/corp727 kandy w/ ghost bats/summer
    86-D/W100 44/corp/318mag/carb/4500/aka shit box/winter
    93w150short/44/corp/360/le/mag "caddie"
    93w250LB51844/60posi 318"New Truck"
    93w350 6 tire CC 60 c/a flat bed dump

    Offline KurtfromLaQuinta

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    Re: 1985 RC 318 With Lean Burn California Smog
    « Reply #59 on: April 13, 2020, 09:55:59 pm »
    na... its a 2 barrel
    It's soooo tiny.  ;D
    500 c.i.- Scat Crank, Scat Rods, Indy Aluminum heads, Comp XR280HR Cam, Six-Pack, Milodon 8 qt. Pan, 727  (reverse-manual, low band apply, 5 clutch disc, 3 qt. xtra. pan), N.P. 205, Ford 9" rear axle (4:11, 31 spline axles, Detroit Locker, converted/ disc brakes). Dana 44 front (converted/ disc, 4:10, Tru-Trac limited slip). Hydra Boost Brake Booster, Gear Vendors OD. 600+ ft. lbs. of torque

    Offline thegrid22593

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    Re: 1985 RC 318 With Lean Burn California Smog
    « Reply #60 on: April 13, 2020, 10:01:31 pm »
    Were you all able to see the videos, just want to make sure they are working for you.
    1985 RC 150LE 4X4 318 | 727A

    Offline KurtfromLaQuinta

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    Re: 1985 RC 318 With Lean Burn California Smog
    « Reply #61 on: April 13, 2020, 10:02:23 pm »
    Nah.
    These are two barrels...

    500 c.i.- Scat Crank, Scat Rods, Indy Aluminum heads, Comp XR280HR Cam, Six-Pack, Milodon 8 qt. Pan, 727  (reverse-manual, low band apply, 5 clutch disc, 3 qt. xtra. pan), N.P. 205, Ford 9" rear axle (4:11, 31 spline axles, Detroit Locker, converted/ disc brakes). Dana 44 front (converted/ disc, 4:10, Tru-Trac limited slip). Hydra Boost Brake Booster, Gear Vendors OD. 600+ ft. lbs. of torque

    Offline dodge82273

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    Re: 1985 RC 318 With Lean Burn California Smog
    « Reply #62 on: April 14, 2020, 05:07:20 am »
    WELL !! it actually looks to be the opposite of what I suspected , fixing stuff virtually is NOT so good , easy . LOL

     Now what I see , ( IF your engine was COLD like overnite cold , when you began the videos ) you choke plate is NOT closing enough / long enough , the pull off is working , it comes down off the high idle cam part way , at which point the choke appears almost fully OPEN , So , either the small s link between the pull off and choke shaft plate ( pass side ) is too short , OR the choke stove needs to pull the choke tighter closed , or a tad of both ... either way , its close , I might start with tighter closed . How old is the "stove " in the manifold ?


     I looked at your previous pix , they do not match the videos , so the choke stove rod , straight is as "tight" as it can adjust , bending that rod can only lessen the choke , so I reverse some of what I said above
     try this first , driver side , the screw that contacts the stepped high idle cam , screw it IN a little , raise the high idle rpms , so when your pull off pulls off , it is a little more rpms that I hear on the video .. Just be sure that when the choke is warm or held open that screw tip does not rest on the cam at all , it can TOUCH the slowest part of the cam , but the electric thingie there is suppose to be in control at that point ... other than that , the pull off's little s rod needs to be opened/lenghtened just a  LITTLE bit ...  it is close to working ...
    « Last Edit: April 14, 2020, 05:46:06 am by dodge82273 »
    78 to 93 parts trucks
    91 w250 318 518 44/60 single 9 foot driveway plow locked
    87w150 44/corp727 kandy w/ ghost bats/summer
    86-D/W100 44/corp/318mag/carb/4500/aka shit box/winter
    93w150short/44/corp/360/le/mag "caddie"
    93w250LB51844/60posi 318"New Truck"
    93w350 6 tire CC 60 c/a flat bed dump

    Offline thegrid22593

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    Re: 1985 RC 318 With Lean Burn California Smog
    « Reply #63 on: April 14, 2020, 12:07:47 pm »
    How old is the "stove " in the manifold ?

    Thanks Dodge, makes sense. The stove is only maybe 3 months old. I always thought the choke opened pretty quickly just didn't really understand what they meant fully.

    I will screw in the high idle cam screw a bit more and see if I can get the choke plate to be more closed when cold not running by adjusting the rod coming off the stove.

    Like you said, minor adjustments first, start the truck, then wait another day to make adjustments again if needed. I'll let you know how it goes today hoepfully with some more choke pictures.
    1985 RC 150LE 4X4 318 | 727A

    Offline thegrid22593

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    Re: 1985 RC 318 With Lean Burn California Smog
    « Reply #64 on: May 28, 2020, 11:43:54 pm »
    Wow! It's been a while looking at these dates. Sorry I ghosted everyone there for about a month, was dealing some work stuff for this COVID thing.

    Anyway, just adjusted the S arm on the pull off tonight to lengthen it a bit. Going to start her up tomorrow to see how she fairs.

    I'll let you know!
    1985 RC 150LE 4X4 318 | 727A