Ford 2.0.Tdci surging power

[diffeyp]

Hi All

I own a 2009 S-max with a 2.0 TDCi engine. For some time now I have been noticing that I get a surging power delivery when the engine is under strain. I first noticed this when pulling a fairly heavy trailer up a hill at about 50mph. I just backed off and it went away. However recently I have been noticing it during more normal driving.

At first I thought it might be the dual mass flywheel, but haven't found anything on the web about these symptoms. Then thought about the vanes on the turbo, however when I connect a vacuum pump to the actuator it moves freely. Also when I start the car the actuator is pulled in fully (by the vacuum from the engine) which is what I would expect.

I have had a look at all the hoses to and from the turbo and can't see any leaks.

I replaced the fuel filter about 25K ago and noticed today that at idle there are quite a few smallish bubbles flowing through the pipe from the filter.

I have no error codes.

If anyone has any thoughts I would be extremely grateful as I don't want to start taking things apart if I can help it.

Thanks

Paul

[r.g.]

I'm experiencing the same issue with my 2010 Smax. Can't find any split pipes, although does smoke a little under acceleration.

Would appreciate peoples thoughts on what could be causing the surging. Do I need to look harder for split or loose pipes?