That's usually the symptom of the balance flap stuck in mid=position because the actuator has stopped working but (1) you said that the balance flap was o.k. and (2) you haven't got a fault code for the VIS system.

Are you going to try Phil-T4's suggestion?

Simon

Hi simon. Yes sorry we have tried Phil-T4 suggestion and injectors all appear sound and pulsing fine.

I checked the butterfly valve and it moved etc. But not checked the actual motor. So waiting for new VIS motor to arrive. Slowly ruling things out.

So it appears after a compression test one of the cylinders is half what it should be which is what is causing the misfire. Possible a leaky/burnt/bent valve. Looks like I'll be dismantling this engine to try and fix it :duh:

A sticking hydraulic tappet would cause that too. Or if the oilway to the tappet is blocked the tappet(s) will slowly lose oil and this will cause lack of compression.

A couple of months ago I had a KV6 that wouldn't start, history was that the car had been stood for about 3 months. The owner had tried everything. When I looked at the car and tried to start it it turned over as if all the plugs had been removed. There was no compression at all.

After numerous attempts to start the engine it would give an occasional slight hiccup. It had a full charge in the battery so I thought I'd do something I don't like doing I turned it over on the key continuously for a good 40-50 seconds :eek:
The engine spluttered and then roared into life, result :D
What had happened was that while the car was stood the tappets had lost their oil, turning over the engine sufficiently built up the oil pressure which refilled the tappets enabling the car to start.

Not saying this is the cause but it can be a possibility ;)

Russ

Interesting you should say that as the car was stood still for quite a while. However we've done about 200 miles since it was stood still so I would have thought it would have had time to clear?

I am having a slightly similar problem. Occasionally when I start the engine from cold the engine fault light comes on. Misfire on cylinder 2 is detected. If I clear the fault with my Autel gadget the fault clears and everything is perfect until the next cold start. Although sometimes I can have several cold starts without the light coming on. I have changed the plug and the coil on that cylinder. Yesterday I replaced the injector. The new injector looks differrent from the one I took out see photos. I was sure I had found the culprit but no, this morning the cylinder 2 misfire fault came back. I am hoping that the plug may be fouled (if the injector was faulty) and it will either clear itself or a new plug will do the trick.

Fred

cylinder 2 misfire has come back. Looks like a major overhaul when the spring weather comes!