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muggo

Member Since 17 Oct 2011
Offline Last Active Jun 27 2014 07:20 AM
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Posts I've Made

In Topic: 2.0 Tdci "surging"

26 June 2014 - 09:27 PM

I've just had this very problem. Mine was also accompanied with a judder on over run around 2000-2250 rpm when I backed off gradually on the accelerator. From a stand still it looked like the end of the world in my rear view mirror because the smoke was getting gradually. I took the usual wishful thinking steps by servicing. Next step I took the egr valve off and then the inlet manifold and cleaned the inch thick layers of carbon off and put it all back together. Took it for a spin. Still the same. Only slightly less black smoke. By chance I checked the intercooler hoses and found a split. Not all the way through but being held together by the weave inside the hose. Replaced with a silicone one and took out for a spin. Power totally restored no smoke no surging no juddering on over run and more importantly. Mpg up from a terrible 44.2 to an impressive IMO 54.6 mpg. All for a 20 quid silicone hose from flee bay.

Thanks for all your help & advice Stevo.  

I have a Haynes manual so I'll find out where the intercooler hoses are & check them out.  I get 46-48mpg usually so I'd appreciate an increase to 54mpg.

Cheers

Paul


In Topic: 2.0 Tdci "surging"

29 June 2013 - 11:56 AM

Thanks again for the comprehensive reply Feet On The Table.

I'll have a look at the air filter & get the fuel filter changed.  I do tend to run the fuel tank a bit low!

Cheers

Paul


In Topic: 2.0 Tdci "surging"

28 June 2013 - 08:16 PM

Is it a mk3 or mk4 Mondeo tdci? (presumably its a mk3 as it says "130")

 

Mk3 Mondeos do not have DPFs, (diesel particle filter) just a small, passive (non- electronic) catalytic converter

 

It could be a number of things, including transmission shunt caused by play in the DMF (dual mass flywheel) that can interact with the anti - stall, or it could be a "feedback loop" in the anti- stall - just use a bit more throttle,/ revs - it is not good for the engine/ trans/DMF to let the engine "labour" anyway

 

There are other things that can cause this, a good service can help,  and cleaning out the inlet manifold, and take it from there    

Thanks for the reply.

I believe it's a Mk3 (the one before the current model).  Glad to hear it doesn't have a DPF as they can be trouble.

I don't like the sound of the potential DMF issue.  It's an ex lease car so although the mileage is high, I think it has spent most of those miles in 6th gear on the motorway rather than stressing the DMF.

I should point out I never labour the engine - I get the new problem when driving on light or no throttle.  Revs are high enough for it not to be that that's causing the shunting.

I used to road test cars for a living so I'm quite in tune with what's happening, but shunting has only recently started.  I just wondered if it's a common problem that could be sorted by, say, adding injector cleaner to the fuel system.