Adjusting An Edelbrock Carbureator on our 1986 GMC Small Block 400 Motor

all right folks we're back working on this 1986 gmc if you haven't seen all our other videos on it check it out donnie is a mechanic i am not and we're trying to figure out what the hell is wrong with this thing we had two guys work on it and uh they couldn't figure it out or get it quite right so we've got it it's up and running it's just idling like hell so we've been messing around with the timing uh we got the starter problem seems to be at least working for now we've got it all shimmed out but our next thing that we're going to do is we're going to adjust this edelbrock carburetor we've got the thing sitting here i don't know what rpms it's at because we don't have an rpm gauge but we're guessing around 800 might be a little higher than that kind of sounds like 800 um which might be a little bit high but it's running so rough that we kind of have to keep it like that whenever you get into it it seems like it runs better so we're going to look at the idle mixture screws on this edelbrock so the first thing that we want to do we're going to back the left one all the way out and then we're going to put the right one all the way in and then we're going back to right when two and a half turns out so we'll see if we can do it without installing it back the left one all the way out donnie don't take it all the way out but okay okay that's good now the right one take it all the way in when you feel it get all the way in come back out two and a half turns okay half one and a half two okay that's two and a half turns now the left one go all the way in and then back it out two and a half turn yeah keep going [Applause] well we didn't make it without stalling it but now that it's stalled let's let's check them both what's that one and a half we'll start from bottom okay okay half one and a half two okay all right check the right one again just to make sure so you basically want to start with them two and a half out you can do it while it's running was that all the way in yeah that's pretty good resistance okay okay all right half one and a half two and a half okay they both look about the same all right i'm gonna start it back up and then we're gonna tune them so basically what we're gonna do donnie you want to loosen the left one you until you get max rpms out of it once it once you loosen it and rpms go up about as high as they'll go and you keep loosening it they don't go any higher you want to kind of go back a little bit but keep them where they're kind of at their max rpms and then we want to do the same one and then we want to turn the idle back down to about 800 where we got it now and then you want to do the same thing with the right one loosen it up until the rpms come up to about their max and then and then you want to uh uh turn it back a little bit so that you're not all the way at the end of the of the that ring there'll be a range where no matter how much you loosen it it's still max rpms and then you want to once you do the right one we want to turn the idle back down again right okay once we do that you want to turn the left one in until the rpms just barely start to drop and when they do you leave it you want them to drop about 20. and then set your damn idle again how you want it and then the right one turn it in until the rpms just barely start to drop and then we'll reset our idle again okay so we're going to get it let me start the truck all right we started back we think we're at about 800 so he's going to loosen the left one until the rpms go up okay it's not really making an effect whoa did you hear it seemed like it it went down a little bit okay so that's good wait a minute uh let the uh put the idle back up just slightly i think you dropped it just slightly to turn the idle no no no not that one okay yeah right turn idle back up a little bit okay now we'll do the right yeah you want to go out okay yep i think that's it man that's it you just tuned it easy as that easy peasy baby all right stand out of the way nineteen i'll give him some gas gonna give it some gas in case it takes off now people the brakes aren't that great on this damn thing but it is in park but it's shaking a little bit so it might fall out of the park hopefully not if it does there's a field over here and a couple trees so um you think them trees will stop it it's not the house given that house is the lawyer he will sue the hell out of us he won't even have to pay for a lawyer because he's a lawyer yeah yeah i think i didn't check but i i think and you know me i never forget it all right i'm gonna rev it up a little bit people [Music] so [Applause] what's the problem i don't really see no problem what's the problem that sounds like a strong ass motor to me what's the problem it's idling a little rough but man we might be down to spark plugs and [ __ ] now did that not sound good what do you think didn't that sound reach in there tell me what you think um i mean the idols are still a little off but i don't know what the hell that ticking is that's scaring the hell out of me oh hey the damn emergency breaks down and those brakes are crap man well that would be the problem i can't go with the gear oh when it's in geared rpm's low as hell [Music] [Music] [Music] do what okay [Music] there's a cinder block in front of you [Music] there's a lot of exhaust leaks in it people that's why it's smoking up a little bit that's coming up it's got new exhaust but it needs welded together things burning my which i wasn't really even looking for i mean i kind of just wanted a stock engine but damn that thing's getting on it