4wd Tercel power and performance tips carburetor vaccum timing

How to fix or tune up, tricks for 3a Toyota aisan carburetor, vaccum and timing power loss acceleration or performance issues

[@arne6787]

From what I have seen the primary side solenoid is used to prevent fuel leakage thru the idle jet when the car is not being used. When key is on it opens up to allow the idle jet to work. If that jet is plugged car will not idle but will run at higher rpms.

[@arne6787]

Another thing I found out. Start car, warm it up. Then turn off. With a flashlight inspect the secondary bore/butterfly. If there is fuel pooled over the butterfly the vent hole in the fuel feed jet is plugged and fuel is being siphoned out of the fuel bowl onto the secondary butterfly.

[@1esaus]

I have a corolla ae82 with the 4ac engine and the carborateur. Im having a slight issue where it runs rough at 2000rpm and at idle sometimes. It has been like that since i got the car almost 4 years ago. Ive replaced the sparkplugwires, the ignition module which was out of spec and kept it tuned up. I will try to rebuild the carb at some point when i have the time for it to try solve the issue. Im guessing just dirty primary jets and such. It is also hard to start when warm where i have to crank on it more. Ive noticed that sometimes i get worse fuel consumption normally its around 0.75 l/10km or 0.8l/10km but sometimes it shoots up to 0.9 or even 1l.

[@M3GAN3116]

Have the same problem on my 87 Toyota Corolla

[@WilberWobbler]

I wish you'd visit eastern Washington to fix my '83 !!!

[@mechmattldschannel4105]

If i make it that way we'll have to meet up. I love to the the old tercels still running..

[@chopperclark516]

great job!! thanks i have one with 2 parts cars, one runner i want to turn into a poor mans turbo relley car any suggestions on suspention mods?

[@mechmattldschannel4105]

Thanx for you comment, and yes i do have a bit a lift info; if you get the FRONT shocks for a jeep cherokee i believe the mid to late 90s model, they will fit on the back shocks of the 4wd tercels,(im going with air shocks for them soon)theres a bushing where bottom bolt on the jeep shock that you will have to pull out to make it fit...easy shmeeesy and it will allow for an easier lift with some stiffer springs on the back and also some nice extra drop down travel for the when the wheels drop down 4wheelin, i think my one 4wd video on here i posted actually shows the rear wheel dropping way down while 4wheelin it, i also put spacer washers on the tranny mount to drop the tranny just a hair, to allow the drive shaft to keep straight with the new ride height.... On the front i just put some simple 2 inch spacers between the strut tops and the unibody, and will need fresh alignment ,couldnt do much more then that properly with out moding out all the suspension and drive train, big diff though!!! Good luck... I'd love to hear how it all turns out, or even see another a tercel vid!!!

[@mechmattldschannel4105]

Also if your running a turbo just make sure to put it beetween the carb and the intake not before the carb cause that wouldn't work to well, cheers!!

[@adelaideautowashes]

I have an Aisan carburetor identical to yours, and i've just realised I attached the needle valve onto the float incorrectly. Never knew that metal wire on the needle valve went around that tab on the float. Welp, looks like i'm taking my carb apart again.

[@mechmattldschannel4105]

It took me quiet a few times to get these carbs correct they are quiet intricate with all the solenoids and power valves and check ball bearings. Good luck my friend happy tercel days, haha!!

[@adelaideautowashes]

@@mechmattldschannel4105 Thanks! It's been 5 months since i've made that comment, and my carb is back on the car, ready to start. Haven't tried to start it yet, though.

[@mechmattldschannel4105]

@@adelaideautowashes I'd love to hear how it works once ya get it going.. best of luck on that !!

[@adelaideautowashes]

@@mechmattldschannel4105 Good news! The car runs now.

[@justinramalingum]

I have a 1983 Corolla with a 3T engine. I want to change the jets so that I can get better gas mileage. I also want to know if there's a better way to make my car lighter on gas

[@mechmattldschannel4105]

Those are sweet cars, i miss my 82 Corolla..i can't really say any facts but skinnyer tires make less friction and better fuel mileage, there may be some tricks with the EBCV, maby if you could rig up a second or third EBCV off a gas vapor tank or something...i think there's a KZbin video of a guy running a lawnmower on fumes ,it's kinda the same concept....it'd need some experimenting though..not sure of I'd mess with the jetting too much unless you understand jetting and air fuel ratios..the most i could say is less air restiction the better mileage, including exhaust restrictions, you could run a bigger air filter , but would have less suction on the jets, so you wanna run a bigger or more rich jet and still keep your mixture correct, ....good luck on that, it is possible, let me know if your able to find something that works!!

[@arne6787]

What about the accelerator pump diaphragm getting stiff and working poorly.

[@mechmattldschannel4105]

Those can be a trick but really all they do is work when the car is cold to make them run richer and when they warm up it doesn't do anything. But they can leak when they get old . Usually the rebuild kits should come wih a new one and fairy easy to change.

[@henryruiz8381]

which number of jets you use on primary and secondary?

[@mechmattldschannel4105]

You know im not really sure, I put in the leanest ones i have (for high altitude) and i forget the numbers, I'll be in there again in the next few months some time as to the carb is leaking gas somewhere into the intake, probly through one of the lead plugs but not sure yet, seems a common problem my back up carbs are doing it as well, I'll check the jet sizes when im in there and try and let ya know, and im going to make a video when i find where the leak is as well.

[@jimstenlund6017]

Does anyone offer new/rebuilt carbs for these? I’ve got a ‘86. Seems like every other carb is available but this one.

[@mechmattldschannel4105]

You know i bought thta one from Rock auto and it had wrong peices and was just a mess.. but i managed to fix it all right and the one good thing was the throttle bushing were replaced. But there is a guy who does the throttle bushing in oregon i think, he has them mailed there and fixes them up then mails them back. I can get ya the number if ya want.

[@jimstenlund6017]

@@mechmattldschannel4105 I’ll try a simple rebuild kit first I guess.

[@mechmattldschannel4105]

@@jimstenlund6017 a new trick or 2 i learned is to take an old ball bearing and Litely tap it in its home to make a clean seat for the new one, another thing im looking at is there ia some lead inserts that can leak gas into the intake, there is some videos to show how to fix it on you tube. I'd also recommend an electric fuel pump as to the gas nowa days seems to vapor lock at lower temperatures, i had to lower the temp on my thermostat as well and also threw in a aftermarket fan controll unit, it enables me to adjust when the fan comes on. Maby ill make a videos of all the mods on my tercel in the next few weeks when i have time. Feel free to check out my video on how to fix the blow by issue, i just uploaded it 2day as well, its an easy fix for the tercels.

[@jimstenlund6017]

@@mechmattldschannel4105 I’m thinking of hood hinge spacers to raise the back of the hood for more ventilation/get rid of some heat.

[@mechmattldschannel4105]

@@jimstenlund6017 i had one i put hood scoops on a few years back.. it did help but also caused some problems with dust and when it snowed.. thats a great idea though cause you could take them back off easy if needed.

[@tylersmith4486]

Where are you at in Idaho? I'm near Kalispell MT

[@mechmattldschannel4105]

Im south near Boise, but hitting up some dirt biking in southern Utah at the moment!! Love that big sky country!! I cant wait to get in those mountains again...hows the weather looking up there?

[@tylersmith4486]

Back and forth but it's getting better. We've still been getting snow but I live a few miles from glacier national park in Hungry Horse and we never have sun anyways.