How can you tell if the fuel injectors are bad?

i had a faulty diesel injector on my 2.4jtd it had done 110000 miles.

the faults on a diesel are it sounds like a tractor as most new deisels run quite quiet, the engine shakes like mad, very bad mpg, unburned diesel smoke out exhaust when the injector fails and sometimes no fault will regester on the comp when hooked up. mine did not took months to find what was At Fault. i also advise to clean egr valve out on routine every 6 months as they are bad for sooting and sticking open.

im not sure the fault on petrol cars but im sure it will also have a missfiring problem and unspent fuel out of exhaust and lack of mpg.

listen for a clacking noise like the piece of plastic u used to put on ur back wheel of ur push bike. mine sounded like a more intense version than that. Ford Mondeo's are prone to injector faults in there deisels.

running cars on low dirty fuel is a major cause of these problems.

i would say to anyone put injector cleaner in and run high revs aslong as it does not sound too badly damaged it could just be a blocked injector and new injectors are not exactly cheap. mine cost £300 then the labour cost of fitting it

hope this helps for any unlucky people who have this fault.