924Board.org

Lau Christophersen · Joined: 17 May 2013 Posts: 123 Location: Denmark/Copenhagen

Today I got my test kit for the fuel pressure.
The following results:
Valve closed(system pressure) 5,5 bars
Valve open, WUR and AAV disconnected 4,2 bars
Valve open, WUR and AAV connected 5,5 bars.
There is no pressure when you stop the fuel pump(leak test).

I tried to turn the car on with the test kit connected(valve open, WUR+AVV connected), the engine does like it always do; the engine starts to stumble, and I can see on the pressure test gauge that the pressure is jumping around between 2,5-3,9 bars and the car cant drive, if you try it dies.

Can it be the fuel distributor that needs rebuilt, or? I hope someone can help me, or the next question will be how I convert the car to EFI.

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Year and model of car?
_________________
Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Lau Christophersen · Joined: 17 May 2013 Posts: 123 Location: Denmark/Copenhagen

Sorry I forgot

It is from 1979 euro spec - so a 931 s1.

Lau Christophersen · Joined: 17 May 2013 Posts: 123 Location: Denmark/Copenhagen

I can see that the system pressure is too low, and cold/warm is too high, can someone give me a clue what could be wrong?

Lau Christophersen · Joined: 17 May 2013 Posts: 123 Location: Denmark/Copenhagen

I was looking one more time at the car and the problems yesterday the jumping in fuel pressure can be seen if I take the intake boot off and look on the "air flow plate"(don't know the name for that one?) at idle then it is jumping up and down at the same rytm as the fuel pressure.

what would course that? a big vacuum leak somewhere? or bad fuel accumulator?