E60 hesitation - torque convertor?

Thanks again for that. 

It was on my to inspect list.  Not sure when I'll get round to doing that though.

I will add that it only happens when engine is fully up to temp and that it is at very low engine rpms, i.e. 1,000 to 1,500 and not the rpms stated above. 

Happened again last night but effect was much less, don't know if this was due to the air con being on?

Andrew

Thanks Dergside.

It's not at the stage of I can't drive the car, more of a minor annoyance.  I'll see what other symptoms I get.

Andrew

Guys

I've got a very small and very ocasional slight hesitation in my engine. I am assuming it's the engine after convincing myself it's not the autobox.

Edit (11.12.09) I think it is the transmission; the torque convertor lock up clutch.

Light throttle about 1,500 to 2,000 rpm and only happens between 30 mph and 40 mph.  The engine rpms fall then rise back and there is a bit of an annoying jerk thru the car.

No engine warning lights are on the dash.

I am thinking another air fault i.e. engine is getting a bit lean momentarily. Edit (11.12.09) Not convinced that's the fault now.

Any thoughts? Appart from plugs, coils, cam/crank sensors, MAF etc.

I know deep down that I am not going to find out whats wrong till it is plugged into a diagnostic machine but has anyone else experienced something similar? Edit (11.12.09) if it is mechanical it won't show up as a fault code!

Andrew