Hi all, looking for some insight, but before that a little backstory.

I have a 2009 2ltr diesel mondeo lot of kms on the clock near 500k. Recently(last week) had to get a new flywheel and clutch. When I got the car back the mechanic said my injectors were knackered as the car sounds like a truck. Today the car has started chugging in lower gears/lower revs when I'm accelerating say after a red light. There is black smoke when I accelerate hard also.Are they related or what do you think it could be? I know nothing about cars and it's a bank holiday weekend here in ireland so I won't be able to get to a mechanic before Tuesday and I need the car for work. 

 

Sounds more like a boost hose has been left loose somewhere.

Though with over 300k miles on injectors, they will be well past their best also.

So can I get them clean or is it new ones?

Would be new ones at that age I'm afraid.  Internally worn, not just dirty.

Ah figured it'd be new, thanks for the info

11 hours ago, TomsFocus said:

Though with over 300k miles on injectors, they will be well past their best also.

They just don't make things to last these days 🤣

So I'll look stupid  but would it be just 1 injector gone? Funds wise I wouldn't be able to afford 4 new ones, only just replaced the flywheel and clutch 

Strange if it's suddenly started to do that since it's visit to the mechanic..

If it was perfectly ok before the visit, I'd suspect someone somewhere has had your good injectors away and fitted some bad ones, also hasn't programmed the ECU with the new codes. But that could just be me being paranoid....

Difficult if you can't do stuff for yourself, but I'd start by taking a pic of the injector code label on the exhaust manifold for reference, then using your camera, take pics of each individual injectors' code labels, write them down together with the cylinder # it's come from. Compare them with the label on the manifold to see if they're the same codes, meaning they'll be the original injectors. Buy a cheap code reader from Tunnelrat electronics, download Forscan and connect to the ECU and read the injector codes programmed in. If wrong, then you need to reprogram them. 

Also, you could do a cheap easy  test of the injectors called a leakoff test, inexpensive kits available on eBay or buy the individual plugs from a local fuel injection garage and some aquarium tubing and small bottles with ml markings upto, say, 100ml. I used a hamster water bottle! A leakoff test is just one of several tests of an injectors performance, but the only one you can do without specialist equipment. For that, you'll need to whip 'em out and take 'em to a fuel injection services garage to get tested,  not expensive, btw. They may even offer a service to refurb any worn ones, as spare parts are available. 

 

 

14 hours ago, Derek5179 said:

So I'll look stupid  but would it be just 1 injector gone? Funds wise I wouldn't be able to afford 4 new ones, only just replaced the flywheel and clutch 

They all wear at about the same rate.  So on a high mileage car, once one fails, I'd expect them all to need replacing within a short space of time.  They would need to be tested, as suggested by Nick above, to determine which are still within useable tolerances.

The black smoke still suggests a boost leak to me though, that's far more likely after a clutch change with a boost hose getting damaged or left loose.

Have you checked if the air filter needs changing... remember it's the underneath that collects the dirt, so you have to lift it out to inspect it, not just look at the top, which is always clean. Black smoke is an indication of poor combustion caused mainly by poor air/fuel mix, so air could be escaping from a split pipe as Tom says, or a dirty filter.