Weber? Maybe.. maybe not.

[Phatcat]

I’ve been contemplating a Weber for my 84 T4WD 3-AC. Yes, I know there’s a LOT of cons with the pros. Many prefer the factory carb to an Weber. I absolutely loved my Weber on an old 81 pickup 22R I had though. It was really fun to play with and learn. Stupid simple, and a breeze to play with. I’m in PNW where it doesn’t get crazy cold or hot often. Anyway, my factory Aisin 3-AC carb functions pretty well. Very well in fact. It took some finagling to replace diaphragms and clearing clogged passages, but we got it running well. So why do I want a Weber? Because I’m sick, a diseased man that cannot leave shit alone. For the record, I’m still on the fence about it, and I’ll keep the factory carb and emissions systems parts safe in a storage bin.

Now, if I were to go to the Weber, what’s the common thing to do with the air suction system? EGR is a simple removal and block off plate, but that air suction pipe seems to run aaaaaalllll the way under the intake/exhaust manifold. I can’t get my eyeballs in there to see with the flashlight what/how it terminates into the manifold. Plug the pipe and leave it? Block off plate way back under there? If I leave and plug it, doesn’t that pipe get really hot without fresh air flowing through?

Secondly, my AC still works and blows cold, not that I use it really ever.. but it does work and occasionally I pop on for a few seconds to cool off. AC may be fine without the compensation linkage, just have to bump the idle up on the Weber..

IDK, just some things I thought I’d ask everyone prior to doing this, IF I actually go ahead.

[dlb]

I can't comment on the air suction system because the Tercels here in Canada don't have them. For the EGR though, the most popular solution someone came up with was to turn that into the PVC port, since you have to remove the phenolic spacer for the Weber to fit under the hood and that spacer is where the stock port for the PVC is. It's an easy enough mod but I just wanted to mention that.

Re: A/C, I agree and would just raise the idle speed slightly in the summer.

I personally don't think the Weber swap is worth it but to each their own.

[Phatcat]

Hey, thanks for the reply. Yeah, I saw a few people had modified the egr port to run PCV to, not a bad idea. I’ll consider that if the Weber doesn’t fit under the hood. I’ve seen people with mixed results on whether the Weber fits with/without the phenolic spacer. I would get the 1 7/8” shorter air filter assembly if I do go that route, and from my research the Weber will fit if you have the shorter air filter, but I could be wrong. I know it’s close. I wonder if my 1.5” coil spacers may help with that clearance issue, not sure what the spacers changed without looking right at it.. Anyway, I still do not have a good answer on the air suction system, and it’s looking like I will probably go ahead with the Weber. I have myself about 95% convinced. Carbs Unlimited here in Auburn, WA is only about 45 minutes away (depending on traffic), and they sell that K740 for $390. Plus, I can get a good deal on a jet kit, fuel pressure regulator (if I choose the redline one). I may just go with the Holley off amazon for the regulator though. It’s not as expensive and will very likely do the job fine. I had a redline regulator on my 81 pickup 22R though and liked its consistency and durability. Ideally it’d be cool to have a regulator with a return port on it. That way I can dial in the 2.5-3psi if fuel and really get it running well.

Let me know what you all do with your air suction/injection emissions systems people.. I know that once or twice I’ve forgotten to plug that hose back in and that it got really hot in a short time without fresh air going through. So I’d assume people plug the pipe or make a block off plate. Idk. Everyone skips that aspect when they do install videos.

[dlb]

I had the short filter (I think everyone does, the tall one wouldn't come anywhere close to fitting even with the phenolic spacer removed) and it didn't fit even with the spacer removed. I ended up cutting the hood and putting a hood scoop over it.

In some photos I've seen of other Tercel's with webers, the air filter is crushed down a bit, so I think some people have different ideas of what "it fits" means. Not saying there's anything wrong with that, just something to keep in mind depending on how detail-oriented you are.

[Mattel]

There was a guy on the facebook page rebuilding factory carbs. but even if you go the weber route please hold onto your old carb for someone else.
I went weber with my Tercel and got it professionally installed but reverted back to a rebuilt original as it had better drivability and less flat spots etc.

[Phatcat]

Absolutely. The old carb will go into a storage box. If I go that route.