There is a ticking/knocking noise coming from engine and the interior of car you can smell the diesel on ford fiesta 1.4dtci on 56 plate.

have the injectors professionally checked as it appears that the tips are not correct ( squirting -not atomising)

Normal a dripping injector makes a knocking noise when you first start up. To me it sounds like a leek. Try looking at the pipes any were above the exhaust or turbo. For the smell to come in to the car the leek will probably be at the front. I'm only guessing here. But I had the same thing on my range rover and it was a joint in the fule pipe spraying on to the block..Good luck

sounds like a p[lugged cat...check back pressure

must have a leak somewhere drive diesol myself no problem with it
check for fuel leaking engine area

Normally, only 2 things stop a diesel from firing:
1. no fuel
2. not enough compression

No fuel can be caused by (obviously no fuel) or a failed fuel pump. To test, have someone turn the engine over and then sniff at the exhaust - does it smell of unburned diesel? (If you've run out of diesel recently, you may have an airlock in the system, this needs bleeding out.)

Not enough compression needs specialised equipment to test - that's a garage job.

my ford ranger run rought when i rare it up it blows some black smoke

I expect that you have an oil leak that is dripping/running on to the exhaust. The burnt oil will smells a bit like rubber. Check for oil leaks that are higher up on the engine. (Valve Cover gasket for example).

The battery could be slightly weak, making the computer go on the fritz, try a fresh battery!!!! The rev counters bounce often with a weak battery.

Leave feedback good or bad.

how is the oil level and pressure?, how many miles on engine? is this a loud knock or rather a clatter/ticking noise? knock is engine rod or crankshaft bearings, clatter loud ticking is valve follower noise. how long before it (the noise) goes away?

change your plug wires and oil