2t dies when normal engine temp is reached?

**jeffro ra28** · 19-07-2006, 10:32 PM

Hi,
Just thought id express this to someone that knows a little more about these old engines.

My ta23 with carbied 2t starts fine in the morning first turn key, no throttle at minus temperatures without a choke. This is good and tells me that the carby is tuned correctly.

However, say i drive 2km's down the road when the engine has nearly reached normal operating temperature and the engine decides to loose all power and when i apply more throttle it has a miss on every cylinder. Doing this basically makes the engine die. However if a nuetral bomb it whilst driving as soon as this occurs and let it idle(which it barley does when this is happening) and count to say 15 seconds(this is all while i am rolling along) i will kick it into gear and away she goes as good as usuall.

Its not really stopping my from going anywhere but is anoying when you are holding traffic up just as it happens going up the hill which is 2km out from my doorstep!

I find it only happens on cold mornings when the engine is cold aswell. Also it will only happen when it is nearly at normal operating temperature. I will also add that the car when warm has an odd and unpredictable miss when driving around town. It happens whenever it pleases but happens totally randomely, say every 30seconds to a minute.
This also occurs with freeway driving, but doesnt occure often enough to stress to much about it.

May i suggest it has something to do with the thermostat? Oh and it has a manual choke.

thoughts suggestions would be great!

**oldcorollas** · 19-07-2006, 10:43 PM

mixture sound rich, so it starts on cold mornings without choke.

it drives ok when cold, but there is fuel pooling in the cold manifold.
when the engine starts to warm up, that fuel starts to vapourise faster, and the mixture gets richer, so it starts missing..

if you give it a bootful and clear it's throat, so to speak, then it gets better? cos the pooled fuel goes away?

i had similar in K motor and could see the fuel pooling

a result of removing the manifold heating plate from between the intake and exhaust...

**jeffro ra28** · 19-07-2006, 10:48 PM

Yes, mixture is Rich. It is interesting theory tho. I must investigate that further. It just seems odd that it basically happens at the exact same section of road every morning(reaches same engine temperature). Then decides to be a pita. I will look into this tomorow morning on the way to work!

**Dale** · 19-07-2006, 11:16 PM

As usual, stu is right on the money!
Stole just what I was thinking

Back when I had a ta22 it did similar things, ended up being that the manual choke was stuck on, and mixtures were too rich. After a new set of points, a bit of a play with the timing, and mixtures, it was like a different engine all together.

By memory, turn the mixture screw all the way in until it's fully seated, then back it off 3 and a half turns. Have a play with the timing and mixtures a little and see how smooth you can get it running, they're pretty easy motors to tune 'by ear'.

**TRAV-KE55** · 20-07-2006, 10:09 AM

Dale, adjusting the mixture screw will only affect idle and just off idle as it is the idle mixture screw, if it is rich chances are its because the float level is to high (perhaps a hole in the float, or sticking or poor seating needle & seat) the power valve may also be stuck open as well, but what it sounds like to me is that your fuel filter is blocked and cant flow enough fuel for normal driving but at idle and very very light loads its ok, when the engine "dies" you sit at idle for a short time yes?? Then drive off fine, because the filter has then let enough fuel through to fill the bowl again and off you go for a bit untill it repeats itself, or just anothyer thought does the air cleaner have a heatriser pipe on it, if you live in the right climatic conditions (cold ect) you can get carbi freeze, which basically does what your explaining then you let it idle for a bit and the engine bay temp (warm air) melts the ice formed by the carbi ventury and discharge tube and your able to drive off again, quiet often only happen once then there is enough heatsoak in everything that it doesnt happen again untill cold starts etc etc.
Trav

**Rodger** · 21-07-2006, 11:45 AM

All other things being good, ie, fuel filter, float level, vacuum leaks, fuel pump, plugs, points etc then I'd back Trav's theory.

Both my 2T and 2T-B set ups used to freeze over on cold evenings and mornings here in Canberra. I was running the round aftermarket filters on the tops.

The first few times running the 2T-B set up was as discribed by jeffro. Driving down the parkway it would slowly die and stop me. By the time I'd tried to figure out what was happening it would start and run faultlessly.

I began to suss what was going on. Trouble was as I got closer to the problem the weather warmed up, the problem went away and so it was not until the next winter that I could test any theories.

Sure enough, next winter at the first sign of trouble I quickly stopped, got out and pulled off an air filter. I could see a whole build up of ice around both barrels.

My choice then was to either refit the original 2T-B filter assembly and drop the heat riser pipe down to the extractors or put up with it freezing by pulling over and letting the heat soak do its job. I took the later option as I saw cost involved with making the assembly pretty enough to match the rest of the car not worthwhile.

Look forward to find out how you sort out the issues jeffro.

Regards

Rodger

**jeffro ra28** · 21-07-2006, 09:10 PM

After being diagnosed by you guys i am almost sure that is because of the cold intake temperatures and failure of fuel to atomise properly. resulting in fuel pooling. As the carby is fresh.

Thanx alot for the help guys! I know wat to do next.