Cleaning Diesel Injectors?

MrMemory

War Hero
I noticed my car put out a good burst of black smoke this morning when I started it up. Not surprised as it's a diesel with nearly 170k on the clock. A colleague suggested that as my driving method was 'steady & stately' my diesel injectors might need cleaning.

On the way back home I gave it some foot off a roundabout or two in the hope that it might clear them some, but I'm also wondering if any of the diesel detergents like Wynns or Redex were effective and if so how often I should apply them.

Cheers.

MM
 
Is your wagon fitted with a DPF, this may also be a culprit.

It might be an idea to post the make/model/age to help diagnosis.
 
Italian Tune Up

Welly the living daylights out of it for a few days, but chuck some Wynn's in it first. Wynn's is my preference but Redex works too.
 

MrMemory

War Hero
Is your wagon fitted with a DPF, this may also be a culprit.

It might be an idea to post the make/model/age to help diagnosis.
Apologies - Ford Focus 1.7 TDCi 2009.

DPF - Diesel Particulate Filter. Is that the same as the exhaust gas recirculation (EGR) valve?
 

Sttrory

Old-Salt
Take of air filter box shaped pipe and then start car spray carb cleaner down remaining air filter pipe it will help clean Egr valve also buy some premium diesel far better then redex
 
Apologies - Ford Focus 1.7 TDCi 2009.

DPF - Diesel Particulate Filter. Is that the same as the exhaust gas recirculation (EGR) valve?
Different thing, similar job. EGR is more often found in petrol engines. IIRC DPF failure can lead to lots of black smoke when accelerating. Ignore at your peril.
 
Start with the cheap- Italian tune-up.
Check air filter.
Next go for Redex or similar for a few tanks and do the carb cleaner thing.
You can get similar additive for DPF filters, poss worth a go.
Years ago I had a 320i BMW 'carbon cleaned', that cleans everything (injectors, head etc), it felt like a new motor had been fitted.
If EGRs are clogged, a carbon cleaning chap will be able to tell you that.

My work van (Transit Custom) has 170k on it, 43 months old. I run 1 redex every 4th tank, dump the lot in. It runs sweetly enough.
 
If you can get access to an electronic fault reader ...

 
Different thing, similar job. EGR is more often found in petrol engines. IIRC DPF failure can lead to lots of black smoke when accelerating. Ignore at your peril.
Wrong. EGR rarely on petrol cars.
 
Italian Tune Up as others said:
Accelerate hard, keep high revs in low gears along motorway/any 70mph road

Forte Diesel Injector cleaner if you can source it. Drain engine bay diesel filter, then pour the can of cleaner into filter.

If it's clogged DPF Italian Tune Up and DPF cleaner fluid.

Check aftermarketonline.net for more info
 

neil82

Old-Salt
Italian tune up will not work with DPF`s, thrashing the arse off it blasts soot out of the exhaust system, DPF during regen needs steady revs and running at that rev range for long enough to complete the cycle
 
I use redex in my car and bike every couple of months.

Back in the day my boss got us all to throw a jerry can of petrol into the MK's every so often. The thinking was that the ptrol made the diesel burn hotter so burnt the diesel crap out of the injectors. Personally, if he hadn't told us to do it I would not have done it..............."so tell me son, how was it again that you blew up the engine of that MK".
 
Black smoke is due to un-burned Diesel particles, usually it happens because the fuel to air ratio is wrong.

Most common causes of black smoke are faulty injectors, a faulty injector pump, a bad air filter (causing not enough oxygen to be supplied), a bad EGR valve (causing the valves to clog) or even a bad turbocharger.

Test for a bad air filter is easy - remove the filter - then run the engine for a short while, if you don't get any black smoke then you know your air filter is partially blocked.

Injectors can be tested like this - run the engine, then one at a time loosen the nut on the injector (with the fuel pipe going into the injector), you should hear a difference in revs when you loosen the nut - if not, that's likely your dodgy injector.

Turbos - these draw oil up from the engine for lubrication, if the seals are gone this can enter the inlet side and put oil into the engine cylinders - check your exhaust pipe for signs of oil around the outlet - (not dirty carbon, but check for oil).

EGR - not really a good way to test these without taking them off, just take it off and clean, these sometimes become stuck - you can buy EGR valve cleaning spray - that will clean off most of the gunk.
 
Nothing except taking the injectors out and cleaning them properly will remove baked on carbon. The " injector cleaner " fluids are just snake oil for the gullible, basically your paying ££££ 's for some coloured kerosene .
 

Sttrory

Old-Salt
Also check rubber plastic pipework around engine bay mates Mondeo would smoke it's arse off one of the rubber plastic pipes to the turbo (I think) had ruptured
 
Italian tune up will not work with DPF`s, thrashing the arse off it blasts soot out of the exhaust system, DPF during regen needs steady revs and running at that rev range for long enough to complete the cycle
Hence why I wrote "keep high revs in low gears along motorway/any 70mph road" - successful regen needs constant exhaust high temp.

Something Gov't/EU "forgot" to tell public when promoting diesel cars (esp city cars eg Corsa) & DPFs
 
At 170k miles, the injectors themselves may be worn out. The tiny holes are designed to make an extremely fine spray which burns efficiently. Over time the holes wear larger due to the friction of the fuel bring forced through them at several hundred bars pressure.

if a good dose of injector cleaner and a motorway run doesn't improve the situation then take it to a diesel specialist.

It may just be that the system needs adjustment or it may be that you need new injectors.
 

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