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sean, UK Ford Master Technician
Category: UK Ford
Satisfied Customers: 3105
Experience:  Ford Master Tech since 2001 & MOT tester mechanic since 1984.
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Ford Mondeo: 2200 tdci runs lumpy after overrun and sometimes

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2200 tdci runs lumpy after overrun and sometimes on pickup from standstill.
rattles a bit whilst running lumpy but clears once accelerating and running at higher revs

Hello, I hope the following is of assistance.

From the description you've given this is likely to be the start of an injector concern. The poor running and noise is due to the injector either spraying the incorrect pattern or incorrect amount of fuel (usually too much) which can be caused by a leaking injector.

The rattle is a diesel knock due to the uncontrolled burning of the excess fuel, at higher engine speeds the fuel is burnt faster and not as uncontrolled due to the engine needing more fuel which is why the noise disappears.

The cheapest option to start with would be to run some fuel additive through the system, try running the fuel low then putting the additive in the tank, also I wouldn't recommend Supermarket quality fuel.

If the car hasn't had a fuel filter for a while it would be good practice to replace this as the low pressure fuel system affects the quality of the high pressure fuel system.

If after these point then to confirm an injector concern you need to have a "leak off" check carried out on the injectors, this will identify if an injector is leaking fuel into the engine. If an injector is replaced then the new injector correction value needs entering into the engine management control module, this can only be done with suitable diagnostic equipment.

Start with these points let me know if I can assist further or if you have more questions regarding this and I'll reply as soon as I'm able to.

Best wishes,


Customer: replied 4 years ago.

Thanks Sean, I'll try a filter and addative first and come back with results



Hello again,

no problem I'll keep an eye out for your reply.

Best regards,


Customer: replied 4 years ago.

Hi Sean


It certainly improved things but not solved.

I think it is a dodgy injector as you said.


Is it possible to reset computer by removing battery connection for a while if I fitted new/recon injectors or do I have to take it to garage ??






Hello again,
the injector values are individual to each injector, unfortunately they need to be entered using a suitable diagnostic tool such as Ford IDS.
Let me know if I can assist further.
Best wishes,
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