73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: dar06003 on September 14, 2016, 09:55:42 pm
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I'm trying to install an edelbrock 1406 carb on my 84 C10 Silverado. The old carb was a quadrajet that had three linkages to three different cables on the drivers side of the carb. Obviously one is the throttle, I've gathered one of the other two is an auto transmission kickdown cable? Is that right? What is the third cable?
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(http://uploads.tapatalk-cdn.com/20160915/93cfd16cccb3ce36353aaa1d6e849ddf.jpg)
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You can see two of the cables in this pic of the old carb, the third cable is hidden behind and underneath the two visible ones
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(http://uploads.tapatalk-cdn.com/20160915/d59f7503f54c345054ef4079b034d32b.jpg)
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Probably cruise control?
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So it's actually the linkage in that last pic, the one with the metal rod that's hooked through whatever that circular thing is next to the brake booster. That's the one I don't get
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Yeah I believe you're right Stewart, that's the cruise control servo I guess. Does anyone know where the vacuum lines coming out of the cruise control servo connect?
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Am I downgrading my carb by going from a stock quadrajet to an edelbrock 1406?
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The quadrajet does have a higher CFM capability but on a smallblock with a few upgrades, it won't be a downgrade.
If it was a Built Big Block it would be a downgrade.
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Edelbrocks are great carbs. I ran them for years. As long as you keep the trash and water out of them, they are basically maintaince free.
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Edelbrocks are actually the old Carter carbs...Edelbrock bought Carter out and back then Carter was a very good carb....i ran 2 of them on a 1970 Dodge charger with a 440 and she would tear up the roads.
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Is the choke plate supposed to be wide open when you start the engine up? It sounds like I have the pedal stomped to the floor immediately after I start the truck, and the choke plate is wide open
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An expertly tuned quad will out perform other carbs in performance and reliability. It just has to be set up for its specific application.
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Is the choke plate supposed to be wide open when you start the engine up? It sounds like I have the pedal stomped to the floor immediately after I start the truck, and the choke plate is wide open
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Yes choke plate should be fully open when you start the engine cold and should slowly close as the engine warms up.
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Is the choke plate supposed to be wide open when you start the engine up? It sounds like I have the pedal stomped to the floor immediately after I start the truck, and the choke plate is wide open
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Yes choke plate should be fully open when you start the engine cold and should slowly close as the engine warms up.
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So why does my engine idle at like 4000 rpm when I start it? I've done a lot of work on the engine over the past few weeks, I deleted the EGR and AIR pump, added headers new exhaust system, new carb, I'm not sure where I screwed up putting it back together.
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Is the choke plate supposed to be wide open when you start the engine up? It sounds like I have the pedal stomped to the floor immediately after I start the truck, and the choke plate is wide open
Yes choke plate should be fully open when you start the engine cold and should slowly close as the engine warms up.
Backwards.
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So why does my engine idle at like 4000 rpm when I start it? I've done a lot of work on the engine over the past few weeks, I deleted the EGR and AIR pump, added headers new exhaust system, new carb, I'm not sure where I screwed up putting it back together.
The new carb needs to be adjusted. In particular, you need to adjust the idle speed.
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Is the choke plate supposed to be wide open when you start the engine up? It sounds like I have the pedal stomped to the floor immediately after I start the truck, and the choke plate is wide open
Yes choke plate should be fully open when you start the engine cold and should slowly close as the engine warms up.
Backwards.
So choke plate starts closed, then opens up as the engine warms?
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Is the choke plate supposed to be wide open when you start the engine up? It sounds like I have the pedal stomped to the floor immediately after I start the truck, and the choke plate is wide open
Yes choke plate should be fully open when you start the engine cold and should slowly close as the engine warms up.
Backwards.
So choke plate starts closed, then opens up as the engine warms?
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Oh yeah its like this. My bad
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If you didn't swap the intake to a square bore, or put a spread bore to square bore adapter on it, then you're most likely sucking air around the wide spot where the spread bore pattern meets the square bore carb. Been there myself.
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Thanks for the responses everyone! I used the manifold adapter from auto zone. I'm going to try to adjust the fast idle screw, which affects idle speed when the choke is active. I'll see what happens and update
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Fast idle screw took care of it, sounds great at idle now! I just thought it was weird that the fast idle would be set so high right out of the box, you never see that in the instructional videos haha
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I just sold my hot rod that had a well built roller 350 and it ran better with the 1406 then with a Holley 3310 and it had over 400hp. On my 79 c15 I am going to try to stick with the quadrajet as it runs fine. Going the simpler stock route this time, Lol. Good luck with project and glad you got her running bud.