Start problem Mk1

In the last weeks, sometimes the normal rpm relentie( about 800 rpm ) relapsed to 400 rpm…
But yesterday the motor dropped out and didn't start anymore…
If i start now the engine, you can hear the motor run, but can not accelerate in an higher rpm….

The ignition is oke……………. :

Excuses my english language

   

Best regards

Ivan

If K Jetronic, could be Fuel pump relay? Also check fuse.

I have already been through 4 fuel pump relays I'm past 2 years….at the end I decided to replace my fuel pump as it was noisy and probably causing load on relay.

Best to test the fuel pump relay for function. Also check fuse.

Only last resort with caution and at your own risk:
You can also use a jumper to bypass relay only to carry out a test or use No 13 relay, turn upside down and connect……again only for a quick test. Not recommended for long term use as the fuel pump will work continuously and you can cause damage.

Good luck

Hey Brinz,

The problem is situated in the

If i start now the engine, you can hear the motor run, but can not accelerate in an higher rpm….




 

Hi Ivan,

Test this solenoid. When you apply voltage, the plunger should pull backwards……this works as a safety cut off of fuel to carb.

If it doesn't work when applying voltage, then this could be the issue as it's restricting the fuel……it's fairly common problem and not expensive to replace.

If it works by applying voltage, then test the live wire which feeds into it….when you turn ignition it should supply a positive live.

Let us know how it goes.

Cheers

I hab exactly the same last year.
After a lot of trial & error I found it was the fuel vapor separator which was clogged.
Most probably due to the ethanol in the petrol and some standing still.
I replaced this by a MkII part.
Succes.

Hey Kris,

Thanks for your advice,

But i don't think is the fuel vapor, because i have fuel on the engine of the carburrator…..

Best regards

Ivan

Hey Brinz,

Also thanks for your advice…..

This week, i going to test the solenoid, and keep you informed….

Best regards

Ivan

If the solenoid and wiring to the solenoid is ok, then next step to check the jets to make sure they are not blocked. You should see the small hole through light. Smallest microscopic blockage can cause issues with idling and running. I experienced this with my 1.3 engine (GF code).

Hey Brinz, Kris

Today, i tested the solenoid….(



 

Has someone a wiring diagram of the environment of the
 

That's good news…..I would check the red crimped joint to make sure it has clean contact…… otherwise there could also be a possibility that the wire has broken from inside with twist and turns over the years and heat damage……best to test continuity of the wire and replace wire if necessary.

Good luck and keep us posted

Check these wires and joints



Best to check Haynes manual for wiring diagram or check this website out

https://workshop-manuals.com/volkswagen/golf-mk1/running_gear/technical_data/wheels_tyres/

Ok I checked my manual and below is the wiring diagram.
N3 is the solenoid which is earthed to the carburettor and the positive goes through 3 single connectors (Txxxx) and to Fuse S9.

So when the ignition switch is turned on the positive is fed through the fuse, then wire going through a series of connectors to the solenoid…..another thing to check is weather you have earth wire from your engine block to the carburettor screw? The carburettor sits on rubber gasket so having a good earth is very important…..if there is earth wire check the condition of the wire and continuity so with heat damage it can break from the inside which can effect the solenoid operation.

Hello Chris, Brinz,

Brinz, first of al,l thanks for the manual.....

I found also a map of the fusee box on the internet.....

This afternoon, i tested(with a ohm meter ) the connection between the conduction solenoid and the connection A15 in the connector
on the fusee box.....this was perfect

also massa connection - battery en cabburator is oke...

There was also no

Best regards

Ivan
 

If wiring ok, just simply replace solenoid, it is not expensive at all…..it is probably a faulty solenoid and works on/off.

Worth replacing as you can rule this out completely then.

Good luck

Hey Brinz,

Do you have an web adress, where i can buy this solenoid???

best regards

Ivan

double check the part number of your original one and check with VW Heritage if they have compatible one for your carburettor.

https://www.heritagepartscentre.com/uk/volkswagen/golf-mk1/fuel-induction/carburettors-parts.html

VW Heritage are good and I believe you may be able to get some discount if you are a paid member in this Mk1 forum

https://vwgolfmk1.org.uk/index.php?page=membership

Hey Brinz,

Here Ivan again…………..

I bought a new solenoid in Germany and placed them in the cabburator….

3 times start ok… the fourth time not ……………….

Contact between A15 en solenoid ok……

But in the fuse box, there is also a contact who goes to the the startcontact key….

This contactpoint is the E2, but these contact is not described in your map ( in my opinion)

Now i have a map from a old dutch manual , and there, you can see E2 goes to the startcontact key…

And yes, a was a bad contact in the connector E ( contact E2)..(.i replaced the contact)

Engine starts again..!!!!

And when you put the contactkey once on, you can here the click of the solenoid….

If you want also the map of the old manual, i can sent you this by post…..

Best regards

Ivan