Hi guys,

My brother in law has a 56plate Mondeo tdci which between 75-80 develops a hesitation the will pop and send a cloud of black smoke out the back before returning to normal for a couple if minutes then it will happen again.
It also occasionally does this coming on boost around town, any ideas??

Much appreciated,
Kieren

 

I would change the fuel filter and go from there.

 

Diesel fuel has to have a minimum of 10% biofuel mixed in. Super market diesel can contain as much as 15%. As a result sludge/fungus can build up in the tank, lines and fuel filter which can cause misfires and hesitation. There are additives that dissolve this sludge/fungus. This happened to my mondeo ST tdci. Plus try adding mineral 2 stroke oil into the fuel. Mix ratio is about 300ml to 50litres of fuel.

 

clean the egr valve or replace it should be a cheap fix i had similar problems with 1

 

Sounds like the EGR valve is sticking. Clean or blank it off.

 

Check the large EGR to intercooler hose that runs downwards at the front of the engine. Mine had a split in it and caused this. It's an easy fix and the hoses aren't that expensive either.