does this sound like a freezing carb?

[Mac]

I bypass my hot air intake for the summer, but i forgot to reactivate it for the winter, my car was acting up after a long drive, but after being parked it would be right as rain again. i think ice may have been accumulating, and when i leave it sitting, it thaws and thats why the car goes back to normal.

anyways, heres the symptoms

-secondary throttle slow to open (big delay) or won't open at all
-car jerks when i come off the gas
-revs up very slowly
-at its worst the car wouldn't rev past 4000RPM, in neutral.

it only did it after driving about 100KM (60 miles)

I know my vacuum setting are a bit off on this carb i rebuilt, so i'm also going to swap the bottom cast iron piece from this carb i rebuilt and the one i took off.
I also think the diaphragm for opening the secondary throttle is now acting up, so i'm going to swap that too.

i think its time to raise funds for a weber, this carb is getting annoying.

[ptothej]

I went on a journey about a month ago from my place in kamloops to the shuswap where my brothers parts car was (for that axle) and on my way and on my way back both times my car basically started to flood itself and eat gas.. the only throttle I had was wide open. The trip out it started after about 30-40 mins into the trip.. when I stopped for gas (cause the car ate it all) I checked over the carb, and didnt see anything, plus got gas.. I fire the car up by holding it to the floor because I was playing with it and because of the problem (flooded) and once its fired it drives 20 mins to my destination completly fine. On my way back I get all the way back to Kamloops and just on the outskirts its acting up again.. then it sits at my dads shop where I unload tools and whatnot, and drives fine all the way home.. that was 100 k each way. Now its never done it to me again since.. but my dads mechanic did suggest a frozen carb as well since I ditched what was left of my heat tube thing when I got the car.. dunno, prob will never happen again and just be one of those mysteries

[neonsport]

The carb in my Tercel will ice up at highway speeds any time the temp drops below about 36 degrees. As soon as it happens the first time, I wedge the flapper for the heat riser open and leave it that way till spring. Mine will start to stutter at whatever speed I'm cruising at, refuse to accelerate, start slowing down, and then drop off to an idle. Once it sits for just a couple of minutes, the ice thaws and it'll run fine for a few miles. With the wedge in place, I never have a problem.

[takza]

I've tested the temp inside the air cleaner to be at ~110F at the vac heat sensor thingamabob. Set up OEM...it gets there real fast in summer...and takes a good while...20 mins?... in winter. This is with the OEM setup.

In summer I run it with no vac to the flapper and draw air from under the front by the headlight...in winter I run straight manifold vac to the flapper so the heat is always on full unless I floor it...when it will pull underhood air.

Unless you like messing around like I'm doing...put it back to OEM...you are getting carb icing. Nothing wrong with your carb?

[Snax]

Although I am not concerned about icing and have a Weber, I have installed a grille block over the upper portion of the grille. I don't know if it really does anything for raising intake temps, but it seems to warm up a bit more quickly in cooler weather. Perhaps it would help with ice prevention as well.

[Mac]

I've tested the temp inside the air cleaner to be at ~110F at the vac heat sensor thingamabob. Set up OEM...it gets there real fast in summer...and takes a good while...20 mins?... in winter. This is with the OEM setup.

In summer I run it with no vac to the flapper and draw air from under the front by the headlight...in winter I run straight manifold vac to the flapper so the heat is always on full unless I floor it...when it will pull underhood air.

Unless you like messing around like I'm doing...put it back to OEM...you are getting carb icing. Nothing wrong with your carb?

I do the same, i bypass the vacuum in the summer so my engine dosn't get any hotter than it needs to be, I just forgot to reconnect it. Previous winters i never had a problem, however this is the first time i've don't such an extended trip in winter time.

[takza]

I use a section of sheet metal that is a little longer than the "lips" on the back of the radiator...and maybe 2/3s the width of the rad. I keep it towards the drivers side away from the fan. It's "sprung" in there...with a coat hanger wire run across side to side as extra security.

This helps it warm up a little better in winter. But you don't gain much if a rad block causes your fan to run more than before.

I still have the same temp probe in there...and I'm lucky to see temps higher than 110F...sometimes 120 or more in warmer weather.

[xirdneh]

i think ice may have been accumulating, and when i leave it sitting, it thaws and thats why the car goes back to normal.

I had a '72 ford courier with a lever on the air cleaner housing that had to be manually operated at the start of the cold season to divert the hot air off the manifold to the carb so it would not ice up.
Once, just to see what was happening when I suspected icing was occuring, I pulled off the road, popped the hood, jumped out of the truck and quickly removed the air filter cover and looked into the carb. sure enough it was full of ice.