Hello i am a french driver of a 1991 skoda favorit 136 ls. Infortunately I have a hard time keeping it on the road so i am looking for some help!

 

I have a problem when the motor is idling, when i stop at a stop or at a trafic light the car stalls everytime. 

I have renewed the seals of the carburator but nothing has changed.  I have noticed the wire of the 12v connector was broken (for automatic choke i guess) but cannot find the reference to repair it. Does anyone know it? I took a photo of it. 

Thank you for your help.

Bastien

 

Hello and welcome to the forum Bastien.

 

The part you've photographed is called TTV. Thermo-time valve.

If you remove the pin from its plastic socket, you may be able to fix it by removing the broken end of the copper and trying to solder the cable to the pin. If done correctly, it can be fixed.

 

If you are suspecting from an air leak, you should also check carb. middle gasket. (Where upper and lower parts of the carb. connects)

Also, air leak can happen from any of these:

- Brake booster hose.

- Vacuum advance hose.

- Idle cut-off valve seal.

- Minor air hoses on the carb.

- Idle mixture adjustment screw o-ring.

 

When the engine stalls at idle, is it when the engine is hot (normal operating temperature) or cold?

 

I've uploaded my carb. info collection for you. They are mostly for VW T3. Some of the adjustment values are different for our carburetor.

https://pixeldrain.com/u/hrWnLTPR

Hello and thank you for all these very complete elements i will study in detail. Ok i could try this as i think i will not be able to get a new pin...

The problem came in different phases. At first i simply noticed the idle speed was slowly reducing from normal (800 then 750 then 700 ect) until not able to keep idling. The motor stalls now whenever i push the left pedal even when i change a gear not rapidly! 

And this happens both when engine is cold or hot. I have changed all the gaskets of the carburator including the middle one so i hope this will solve my problem because i don't know what to change next...

 

 

The first thing I would do is a visual check.

You can run the engine without the air filter box. (For checking purpose, don't drive without the air filter)

That way, you can see the choke plate. When the engine is hot, it should be all open. Because of being automatic, a correct functioning choke is vital for the engine's operation.

Also, you can listen to it this way. If there is an air leak somewhere, you will hear a gurgling sound.

Without an air leak, carburetor should have a constant hiss. Like listening to the end of a vacuum cleaner's hose.

 

Edited 30 April, 20233 yr by R_Blue