[kingcreole]

Sean .I know this doesn't help............but anything correctly engineered shouldn't have to take a 10-15 mile 'Italian Tune' on the motorway to sort things out with a DPF....I've read hundreds of threads and post on it and my estimation is that the it is over-engineered...in short a money spinner for Dealers...and filter manufacturers..who are hand in hand.

If to rectify marginally shorter journeys ..you have to waste £10 worth of fuel blasting clear a DPF then ..the whole concept is a scam as it was with TWC...burn off the un-burnt fuel (which should have been burnt in the 1st place) with some hot platinum..its the same shit all over again....intentional inefficiency to keep industry and oil refinaries outputing at max vol.

Mech Eng myself ...Strathclyde Uni 1994

 

[decky_eire]

Relief to find this thread. I have had the same issue occurring for 6 months, its an absolute nightmare.

So far I have had dpf regenerated numerous times, replaced air and fuel filters, cat has been changed on it, injectors have been replaced.

Final step we took back in october was to plate the EGR and the car has driven perfectly ever since. Until this week, after the bad raid, the car is juddering randomly, especially in early acceleration. Just like a giant Hiccup. Hope its something simple like the EGR plate has slipped or somehting but doubt its going to be that simple

 

[iot]

Hi

Has anyone managed to resolve this problem?

I too have issues re jerking/hesitation at 1500RPM have had the problem for 2 years, I bought the car at 1 year old and it was present from day 1.

The car has been in on 6 occasions and went to 'Ford HQ' for 5 1/2 weeks once.

The most annoying part is that it is intermittant and didn't happen when I took out a Ford engineer (Typical).

Injectors checked, EGR valve changed, diagnostic checks via Ford IDS system and no faults - Well, at least this is what Ford tell me they have done.

It's about to go in for a seventh time and I'm just trying to do anything I can think of to help them solve the problem.

Thanks.....

 

[Focused]

Certainly a strange one. Jerking/hesitation would suggest poor combustion.
Am thinking a thorough check of fuel & air supplies is needed here.

Considering the diagnostics performed to date, which is rather comprehensive, have you done a thorough check of air intake i.e. air filter, MAF, hoses. Fuel lines i.e. high pressure lines, fuel filter.

 

[El cargador]

i have a 2.0 tdci 2005 and mines had this problem for a few years niw.just recently i cleaned the EGR valve and system i also replaced 2 injectors with 2 second hand ones.this has improved the stutter but now winter is approaching the problem is returning as always also the exhaust fumes smell horrible(see my post under "DMF?"

 

[n5ayl]

I've also the same fault on my 2005 tdci and I can tell ya I've changed most parts including dmf and clutch dpf fuel system apart from pump had injectors cleaned very annoying and no one seems to have a a scooby doo

 

[n5ayl]

Just a update on my post today I have found air bubbles traveling from the fuel filter housing through the clear return pipe I'm guessing that this is my fault as any air in the fuel system would cause issues be interesting to know if any other cars above have the same issue you can seen this by removing engine cover and watching the clear pipes when engine is on tick over

 

[sevvymck]

King creole, totally agree with what you're saying. It is annoying having to do your own fixes to simple problems that shouldn't exist and that have arisen in order to save a few quid.
N5ayl, I had the same issue with the same observation regarding the air bubble. This issue seems to occur post fuel filter replacement. This car doesn't have an LP pump in the tank so any form of leak in the LP side of the fuel system will draw air in. This does collect in the opaque corrugated hose to the rear drivers side of the engine bay. The fuel system needs to be purged of air.
It depends on your skill set. If you're confident to loosen the injector pipes and crank the engine to purge them of air then go for it. If not get a garage to do it for you.
I have also read that the fuel pressure sensor can be faulty. This is apparently located in the common rail manifold and comes with the manifold at a nice price circa £300.00. I'm not sure how accurate this is?
Good luck and if you get it sorted please feed it back to us all.
Regards
Sean

 

[El cargador]

i have a focus 2005 2,0tdci and have had the same juddering almost like a misfire since i bought the car in 2007,i've had it checked by ford.i've changed filters cleaned the egr valve.put in 2 injectors(2nd hand ones)
it was a lot better but after 3k it's returning to as was.it is more noticable on start up at 1400rpm and is more evident in cold weather.

 

[El cargador]

regarding air bubbles in the fuel lines.i have had the same problem some mechanics have told me that's normal and they are removed later and some said there should'nt be any bubbles. so it was suggested that i cover the fast connect fuel connectors with grease which seems to have cured the bubble problem so it seems the connectors are worn

 

[RB2004]

Juddering below 1500rpm is because your turbo isn't spooled up.

Drive with revs above 1800 at all times whenever possible and it will be fine.

My guess is 30mph in 4th gear?

And people wonder why they have dpf problems, DPF requires heat, drive around at low revs all the time and exhaust will never get hot.

Rev to 3k rpm when pulling away and drive with revs at 1800rpm or higher and it will drive better than ever.

If turbo isn't spooled up which it isn't below 1800rpm it's gonna judder, the engine compression is designed for compressed air, if the air isn't compressed it's not getting enough air... Hence juddering.

 

[MatRIX115]

I had this problem for the last four months, my local garage told me it was the turbo pressure sensor. The vehicle would judder / hesitate as if it was starved of fuel. I contacted my local Ford main dealer for a price for the part, however it comes as a complete unit on a plate, as it includes the pressure sensor for the egr valve. The Ford dealer price was £360, took a while for one to come up on ebay and was purchased for £46. Once fitted the problem has gone and has been the case for three weeks. Vehicle pulls like a train with no black smoke.

History of my vehicle

Ford Focus 1.8 TDCI 115bhp Duratorq Lynx engine

All work below done prior to the issue above occurring:

DMF shattered at 68k, replaced along with new clutch

New timing belt and water pump at 96k

All injectors reconditioned, new fuel pump and filter at 100k

Turbo replaced at 105k (was starved of oil due to a crack in the intercooler and connecting pipe)

 

[arcon]

Sevvy you misunderstand the purpose of the EGR. It is to reduce nox emissions caused by too higher combustion temp. It dilutes the mixture by redirecting exhaust gasses which are insert to the inlet side.
It opens during heavier loads, not under light acceleration

 

[kingcreole]

the true pupose of any EGR sstem is to reduce CO2

 

[kingcreole]

can u think of another reason why dirty burnt air is introduced? a cheaper CO2 licence bracket perchance? perhaps its to do with warmer air > better 4 cruising...cold air better for power....

 

[arcon]

the true pupose of any EGR sstem is to reduce CO2

No it's not
Co2 is the product of the cat which wants co levels down.
Egr is to reduce nox emissions by keeping combustion temps down.

 

[arcon]

can u think of another reason why dirty burnt air is introduced? a cheaper CO2 licence bracket perchance? perhaps its to do with warmer air > better 4 cruising...cold air better for power....

Reduce HC emissions
Greater control of combustion temps as they are typically inert
Reduce nox emissions produced when temps get upwards of 800c ish

 

[kingcreole]

CO2 is primarily the product of combustion..cat CO2 is secondary

C8H18 (octane) + O2 >> CO2 + H2O

..3 way cat...1) to turn unburnt HC into CO2 +H20

2) to split NOX and recombine into N2

3) to burn CO into CO2

reduction of NO2 is better dealt with by keeping lambda at or around 1.00 other wise the catalytic converters cannot cope and their NO2 to N2 efficiency drops off fast.

what do you mean by inert...unchanging?...combustion temps are level.?.in steady state driving ,in steady temps and humidity ..then ok.

The higher the combustion temp. the more NO2 will be formed.....but its not alot

http://www.alentecinc.com/papers/NOx/The%20formation%20of%20NOx_files/The%20formation%20of%20NOx.htm

..how can introducing a very hot (lets say 8%) of bile decrease the chance of NOx forming, the very opposite would be the aim?

NO and NO2 is formed when lightning strikes...how long has the world been ok with that?

MOT 's in the UK only measures (as printed receipt) ppm of CO and HC so in the EU CO2 (tax band) CO and HC is all that matters to VM's... not that they know all things..but who does?

 

[arcon]

Inert as in doesn't combust. Same as gas when welding for example is inert.
So you have 500cubic centermetres to fill and combust in a cylinder.
You want change the mixture to control temperatures nor can you put in less as you'll get running issues as compression won't be what it should.... So put in an inert gas, exhaust gasses, say 10% so you now have 450cc of air/fuel mixture and 50cc gasses. So combustion pressures remain unaffected but combustion won't be as hot.

 

[kingcreole]

I would hope combustion temps don't combust and are inert..as neither make sense in the English language..in terms of combustion

A temperature cannot combust as its a property OF a material at aspecific time. A material can combust at at given temperature and pressure.

If this gets more cemantic than it already is then you can have the thread arcon