Hi all

 

My Polo has sat and not been used for around 3-4 months. I went to start the car yesterday and discovered that battery was completely flat and wouldn’t accept a charge from my battery charger.

 

Managed to replace the battery with one with charge and started the car up. The car will start but without applying any gas once the engine has started, the car simply dies.

 

does anyone know what is happening here or why this is happening? What do I need to do to make it run again without it cutting out?

 

thanks

 

 

A few ideas.

 

Pierburg auto-choke flap might be seized too far open.

 

Or fully closed and the pulldown unit is not cracking it open a little bit like it should when engine fires, because vacuum pipe or internal membrane perished.

 

Exhaust baffles have rusted and collapsed.

 

Rubber base mount for carburettor might have perished.

 

Idle circuit partially blocked.

 

Water in fuel if rusty filler neck and rain exposed (isopropyl alcohol will mix with water and burn).

 

 

You might be able to adjust the idle speed screw to make it run while looking for other issues like seized drum brakes.

 

 

 

Edited 25 July, 20224 yr by dvderlm

Is the carburettor earth wire attached to a  blade terminal on inlet?

 

I know the autochoke is partly electrical,and there's a part channel heater, but some Pierburg 2e's have an electrical idle-cutoff valve to prevent run-on (dieseling) when turn off ignition.

 

 

Check fuse S9. It supplies the carb.

Simple check is whether the horn sounds with ignition on.

Thanks so much for your replies, dvderlm.

 

During the brief moment where I did take a look to see what was happening, I did notice that the choke flap was practically open completely. I thought this was strange as on a cold start shouldn’t it be nearly closed in order to restrict the amount of air going into the engine?

 

The exhaust baffle I believe is intact. The car itself is garaged and the exhaust is standard and clean so I don’t think that this is the problem.

 

The rubber carb mount needs inspecting. The car has never run properly and the engine is always hunting. It also has cut out whenever revs drop etc so that’s a tell tell sign that the carb mount needs replacing. I’ve even applied pressure to the air box and the engine note changed and it started running better for the brief second whilst my weight was bearing down upon it. I believe that this is one of my main culprits, I just don’t feel confident enough to change it. I think I know how, but I don’t know how to reset my carb (Pierburg 1B3) again afterwards.

 

With regard to idle circuit, I believe that the idle jet needs spraying through with compressed air or carb cleaner and I’m hoping that this might clear any blockage or debris in there. I’ve never done this and believe this could be another factor in the car not idling properly anyway.

 

There is no water in the fuel. The car is garaged and is only driven in good, dry weather. The filler neck looks clean and I haven’t had any leaks from it when filling up.

 

I will take a look at the carb’s idle screw. Do you know which screw adjust the idle speed on a a Pierburg 1B?

 

I believe that the carb’s earth wire is attached the  inlet. I noticed that during my brief inspection.

 

I forgot to check the horn. I will do that first thing when I get back.

 

will be sure to keep you updated on this. Thank you