My diesel Mondeo has just clocked up 140,000 trouble free miles.
Yesterday though, on a 300 mile journey, I noticed a problem I'd describe as surging.
On very light throttle, the power seems to come & go slightly. Sometimes it's bad enough for the rev counter to show a drop in revs too.
I've had this problem before & have posted a thread asking for advice but nothing useful was suggested. The intercooler hose isn't split.
Last week I had a "fuel service" including adding an additive to the fuel. I also had the fuel filter changed.
Power seems slightly down but i could be wrong here. MPG is 48-50 on a long run so it can't be that bad.
I've tried revving to max with a warm engine which kicked out some smoke but didn't solve the sensation I'm getting.
Could this be a problem with an injector? At 140k miles, is this to be expected?
Any advice gratefully received.
I've just been out & noticed lots of black smoke from the exhaust, most of the time (I must clean my back window!) Also noticeably down on power.
Will more fuel additive or an expensive diesel tankful help? Can I thrash it better?
Halfords who did the fuel service did a "before & after" emissions check but didn't give me the printouts as they usually do. Is this likely to be relevant?