K-jet woes! Please help

[Robinxr4i]

Right when I brought the Sierra it misfired at anything over half throttle, the guy I got it off said he ran it out of petrol and ever since that it developed this problem. I changed the fuel filter which for one whole day seemed to cure the problem (the old filter was full of grey jelly!)........

The next day the car has the same problem so I took off the new filter assuming it was dirty again, but it looks all clean. I blew it out with an air line just to make sure. Put it back on and still it had the same problem.

I gave the car a good service (plugs, oil, filters, dizzy cap, leads ect) which seemed to make it a tiny bit better, but it still does it. Any ideas? Low pump pressure? blocked fuel lines? knackered metering head? could the fuel accumulator cause this?

The fuel pump is very noisy, got a new one in the post and the fuel tank has (what looks like) a chemical repair, so I've got a new one of those too. Both of these I'm fitting at the weekend.

Thanks in advance Robin

[Fiat Daft]

do these have a seperate pump in the tank and another underneath with the accumulator?

[Deleted]

I would try cracking the fuel lines at the injectors and seeing what sort of state the fuel is like that is coming through...

[steveo3002]

noisey pump wont be helping it

maybe a blocked injector?

[Robinxr4i]

May 20, 2010 18:36:40 GMT Fiat Daft said:

do these have a seperate pump in the tank and another underneath with the accumulator?

Just one pump, which is situated on the bottom of the spare wheel well next to the accumulator.

After I sold my old XR4i they guy I sold it too, put a new fuel pump on it and he said it had went much better once the fuel pump had been replaced. Could some debris from the tank damaged the pump?

[RobinJI]

May 20, 2010 19:34:39 GMT Robinxr4i said:

Could some debris from the tank damaged the pump?

sounds the most likely thing, especially if it's noisy. Failing that, try anything else in the fuel system. The fact it's happening only above half throttle suggests it's unlikely to be an injector.

[suterman]

The one common thing on the Volvos with K-jet was crumbling injector (and injector carrier) o-rings, letting unmetered air in.

Other than that K-jet (the actual kjet bits) was mega reliable and never went wrong for me anyway.

[datsundrew]

I had a golf, had 2 pumps in 5 years, both times lost power or misfired, at high revs initially and went on to lower revs over time. If the pump is not making a healthy buzz/hum and doing more of a whirring noise its goosed.