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make sure the choke plate is where it needs to be, (needs to be almost closed but with enough gap to allow starting)

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It is. It has the gap specified when I rebuilt the carb. It's closed but open enough to let air in. Is there a way to check the EGR valve without removing the intake manifold? Also, what is the vacuum supposed to be off the manifold & into all the vacuum hoses?

there is, but it requires a steady hand, a mirror and a vacuum pump.

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what is thee easiest way to find out if I slipped a tooth on timing or not? Could that happening prevent me from firing, when I confirm compression, spark & gas going to the carb?

So a friend came over & we got it to fire and idle, but barely & not for long. Very weak & erraric. Seems like there was too much air or not enough gas. Then he noticed on the barb where the main body & throttle body meet... there is a gap. I can wiggle the gasket. It wont tighten down any further. Sux as I didn't do that part of the rebuild. The metel tube coming off the main body wont go all the way into the hole for it on the throttle body. WTF? How do I handle this? It's the stock DCH340.

take a picture, im having a hard time understanding what you're saying...

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To the Oquirr hills for awesome thrills! Go-go 4wd, Activate!

You can see the gap & angle with the metal tube. It wont sandwich down together flush. The gasket doesn't make seal. WTF? How the heck do I fix this?

There are screws there from the bottom to hold the throttle assy to the carburator body, did you tighten these?
If it will not seat, then remove the assy again and realign the dowel pins to seat it properly, do not force, it will fall together easily when everything is aligned properly.

I'm confused. There is only one dowel tube and it is lined up but it's hole isn't deep enough to allow it to fit all the way. I just don't get it. The kit came with a thin gasket for this spot. Does it need a spacer?

Anyb ody ever tore down or rebuilt a DCH 340 or simular and know if the area I'm talking about needs a spacer or just a very thick gasket? I guess I have to try to make my own since the one provided doesn't fit.

I bet egg has. Are you sure the hole/holes the dowel goes in is clean all the way to the bottom? If there is anything stuck in there it might cause what you are seeing.

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1980 4x4

Yeah, the hole in the main body is clean. The dowel is part of the casting on the main. The hole serves some purpose as the recieving hole in the throttle body only goes in 1/16th of an inch in fit diameter, but the center hole opens right next to the primary butterfly. I guess someone rebuilt it before me or the manufacture did something weird. If I was to drill or grind, lowering it down changes how the linkage all meets up. Should I try that step anyhow? The gasket pattern is too small for me to make my own gasket. Does anybody have a stock DCH 340 or simular that they can check if this joining location is a flush meet or gapped by a spacer or thick gasket?

I found the rebuild kit I bought a few years ago all I used out of it was the accelerator pump and the carb to intake gasket I think. Anyway the gasket in this kit that you need is the same thickness as two quarters stacked flat on top of each other about 3 milimeters 1/8th inch.

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1980 4x4

As I remember the gasket was fairly thick, 1/8th inch sounds about right. The tube is usually staked in place. I would try tapping in down lightly with a hammer, it may drop a bit. Sounds like someone has kind of messed it up for you.

So I used a cork/rubber material & got it all back together. Then when started, she started right up fine. Seemed to need a slight timing adjustment & fuel mixture done, but then after like 5 minutes or so, it died. Then when I tried to restart it caught and backfired very loudly. I took off the aircleaner and noticed that the choke butterfly is lose and flaps around. Is it right to assume that the linkage isn't set right and when it heated up the kickdown & choke didn't work right? Could this also cause the backfiring?

yes...

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FIAA!

SFPP!

anybody have a photo of what the linkage should all look like on a stock DCH 340 carb?

Its been three months since its ran, right? I'd let it idle with the air cleaner lid off and see what is going on. This is a day to celebrate!!!!!!!!!! Search anything with the word carb in it and you will probably find a picture. The choke butterfly is always loose and I dont think it is actually physically connected to the throttle linkage but I could be wrong on this. The backfire could be from any number of things. If it choked out it would probably just die but if it was trying to die and you were pumping the gas and it backfired and died I wouldnt worry about it. Did it backfire out of the exaust or out of the carb?

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1980 4x4

died out of the carb. I wasn't pumping it either. Then I went out there yesterday to start & it almost fired. Wanted to again. Smells real rich in fuel. out the tailpipe and bowl. Aircleaner was removed to make things easier. vaccum line is plugged. We were all cheering and clapping when it started, but then it sucked when it died in 5 minutes. when it did, my dad was adjusting the mixture screw alot back and fourth. It's back out 2 turns and still not starting. Now there is a super rain storm happening so outside sux. MAy put a tarp up. wonder what to do next?

If the mixture screw was opened far. then screwed back in, is there any way that something is stuck open inside to make it too rich?