Engine wont pull below 2000 rpm is it vacuum hoses

My K wont pull below 2000 rpm which makes road driving a PITA…
The problem follows a tidy up of the
engine bay and removal of the vacuum hoses which control the resonance valve as the valve has been removed at some time. The manifold vacuum pipe goes directly to the MAP sensor and one pipe from the vacuum resovoir was just dangling in the breeze,it had a T piece with short bits of pipe but not connected to anything The diagram shows this connected to the inlet vacuum pipe. the other pipe went to the the flapvalve control sensor thingys.
I think I have replaced as they came out a- la manual but it still wont pull properly… any suggestions??
Need the answer before FF6

Can you post a pic ?

Dave Andrews said “Air Leak”
Junks changed all the sensors (What a hero) To no avail,
concluded Air Leak.

Midnight last night I removed all the pipework on the inlet side to find the small vacuum pipes out of the manifold had split up against the block…3 out of four.
No way you could see the prob without dismantling…
Replaced and back to normal…
Just goes to prove the experts were right…thanks all.

Are these the ones that connect into plastic ‘T’ pieces and on to the fuel pressure regulator ?

Yep…you cant see them very well and the splits were on the block side so needed dismantling to find prob.
If you are doing a replacement job dont use petrol pipe …this expands in the heat and you are back to sq 1

Yep…you cant see them very well and the splits were on the block side so needed dismantling to find prob.
If you are doing a replacement job dont use petrol pipe …this expands in the heat and you are back to sq 1

Yep…have recently been through this and I tried 3 or 4 different pipes that all leaked when the engine got hot - this included some vacuum pipe I got from PartCo.

Have now installed some Samco vacuum hose I got from Demon Tweeks and it seems(!) ok…really need a trackday to be sure though.

ok…really need a trackday to be sure though.

There’s one just around the corner from you this Thursday

ok…really need a trackday to be sure though.

There’s one just around the corner from you this Thursday

I know…wish I could make it matey

  • but I’m off skydiving instead