Cold start - engine vibrations, changing RPM - what to check

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AdvTechTS
Posts: 2
Joined: Sun Jan 17, 2016 2:58 pm
Vehicle: Ford Focus LT TDCi 2.0L

Re: Cold start - engine vibrations, changing RPM - what to c

Post by AdvTechTS » Sun Jan 17, 2016 5:01 pm

Hi, is your car fixed now?
I had very similar problem with a Ford Focus with the same engine it had the following cylinder contributions
IMAGEDATA_FOCUS_PCM(PowerTrain Control Module)_DAT_0003.jpg
before injector was replaced
IMAGEDATA_FOCUS_PCM(PowerTrain Control Module)_DAT_0003.jpg (122.06 KiB) Viewed 5222 times
I then checked the back leakage and found that #3 was excessive (others were good).
back leakage 2016-01-11_hot_lowres.jpg
back leakage
back leakage 2016-01-11_hot_lowres.jpg (401.53 KiB) Viewed 5222 times
I replaced Injector #3, car is now perfect.
IMAGEDATA_FOCUS_PCM(PowerTrain Control Module)_DAT_0008.jpg
after injector was replaced
IMAGEDATA_FOCUS_PCM(PowerTrain Control Module)_DAT_0008.jpg (167.07 KiB) Viewed 5222 times
You need to remember that cylinder contribution is purely looking at crankshaft spend in correlation with injection at idle,
if your injector #1 dribbles fuel it could cause a pre-ignition (knock) and then accelerate that piston (hence the 1.40 contribution).
Diesel engines are always lean, any extra fuel will cause an increase in speed and because one cylinder is accelerating the PCM must stall others in order to maintain the desired RPM (otherwise you will have a runaway engine).

rmkk
Posts: 17
Joined: Thu Jan 07, 2016 6:20 pm
Vehicle: Mondeo 2007/2.0TDCi/103kW, Focus 2006/1.6TDCi/66kW

Re: Cold start - engine vibrations, changing RPM - what to c

Post by rmkk » Sun Jan 24, 2016 11:18 pm

Hi, thanks for posting Your case, because it gives me a hope for such easy solution.

Anyway, my car is not fixed yet. I'm waiting for my service to fix another car and makes a room in garage to replace injectors in mine. New injectors was already delivered to service.

Today I made a live data record of idle engine, relatively warm at 19C. Interesting is, that after blinding a EGR, there is still a hunting of engine probably caused by EGR. It is something I cannot understand. I'm posting part of diagram where EGRVP_V reguraly opens/closes what increases a load and it makes a shakes of engine and all the car. If somebody has an idea how to explain it, please let me know.
Attachments
Blinded_EGR_causes_Load.png
Blinded_EGR_causes_Load.png (24.63 KiB) Viewed 4849 times

stojanhu1981
Posts: 12
Joined: Fri Nov 18, 2016 8:22 am
Vehicle: mondeo 1.8 tdci 130hp 2007

Re: Cold start - engine vibrations, changing RPM - what to c

Post by stojanhu1981 » Fri Nov 18, 2016 11:45 am

Hi.

Did you solve the problem? I se you have high fuel pressure (460 bar). On idle must be 300+-10 bar, when cold 360bar(360 kpa). Did you check glowplugs, IAT sensor? I also have an issue with cylinder balaces on mondeo 2007, 1.8 tdci (330.000 km on clock), but i didn't notice any starting/driving problems. The only thing is that i can't drive under 1800rpm in 3rd uphill. I have balances cyl.= 0.8, cyl.= 1,cyl.= 1.3, cyl.= 0.8. They fluctuate up and down. I replaced reconditioned injector on cyl. 3 but stil the same. After that replaced ultrasonic cleaned injector from cyl. 3 to cyl. 1-still the same, so i gived up. The slight improvement i noticed when i used lubricating and cleaning additive from bosh specialist. (http://www.motornaolja.com/produkt/dize ... ppante-25/).

Description : additive for Common rail cars with/without DPF. It lubricates an cleanes injectors and pump, reduces smoke. For lubrication 0,1lt on 50lt of diesel, for cleaner hole botlle on 5 lt of diesel.

Stojan

hojland
Posts: 1
Joined: Tue Jan 17, 2017 6:47 am
Vehicle: Ford mondeo tdci 2.0 2010

Re: Cold start - engine vibrations, changing RPM - what to c

Post by hojland » Tue Jan 16, 2018 3:08 pm

Have you fixed the problem. Mine dos the same

denbo
Posts: 612
Joined: Mon Feb 06, 2017 3:00 pm
Vehicle: ford focus 16 zetec

Re: Cold start - engine vibrations, changing RPM - what to c

Post by denbo » Tue Jan 16, 2018 8:13 pm

On the mondeo mk4 i will only fit NEW. Always get problems with rebuilt ones sooner or later.

stojanhu1981
Posts: 12
Joined: Fri Nov 18, 2016 8:22 am
Vehicle: mondeo 1.8 tdci 130hp 2007

Re: Cold start - engine vibrations, changing RPM - what to check

Post by stojanhu1981 » Tue Oct 16, 2018 8:01 am

idle_hotengine.png
idle_hotengine.png (5.65 KiB) Viewed 1628 times
AdvTechTS: where did you buy injector? Was it new ? I have also bad balances however engine runs fine in idle. Somethimes i only hear a slight diesel knock when engine is cold and weather is cold. On operational temperature is fine. Injectors on cyl1 and 4 were already cleaned and tested on test bench and they are fine. Do you recomend me to do a back leak to see why do i have on cly3 high balance?

Regards,
Stojan

AdvTechTS
Posts: 2
Joined: Sun Jan 17, 2016 2:58 pm
Vehicle: Ford Focus LT TDCi 2.0L

Re: Cold start - engine vibrations, changing RPM - what to check

Post by AdvTechTS » Wed Oct 17, 2018 11:41 am

Hi Stojan, I bought my injector from my local siemens diesel dealer. you are supposed to replace all 4 at once. The siemens injection system doesn't allow you to enter different calibration codes so you need to order a new unit with the correct compensation code. It was new and it wasn't cheap. In my case the back leakage corresponded with the cylinder that was different to the other 3. Yours look a little different, your 4 codes are all different so which ones are good??? If you have access to a picoscope you could try to do a running compression/balance test when it is cold and try to determine which cylinder is playing up.

stojanhu1981
Posts: 12
Joined: Fri Nov 18, 2016 8:22 am
Vehicle: mondeo 1.8 tdci 130hp 2007

Re: Cold start - engine vibrations, changing RPM - what to check

Post by stojanhu1981 » Wed Oct 24, 2018 7:06 am

Hi,

I have 1.8 tdci LYNX. This engine has no clasification codes (3,4 or 5 like other PSA engine with siemens injection) and you can replace injectors as you want. Injectors from 1 and 3 cylinder were tested on a test bench and they are OK. Injector from 4 cylinder has a new piezzo and nozzle. Backleak from injectors from 3 and 4 cylinder are also the same. In a few days i will do a back leak test for all 4 injectors and i will see if there is a problem in injector on 2 cylinder. I think that if are all 4 injectors equal i will leave it as it is, because i have the same values 30,000 mls (since i own this car). But I noticed that this diesel knock is related with blanked egr valve so i drilled a biger hole in a blanking plate and this sound has almost gone. However my balances are diferent the engine doesn't shake, the idle is fine and at 2000rpm they are all equal. Fuel consumptin is 56mpg (5lt/100km) The engine has only a slight movement on the side of gearbox which can bee moved also with hands.

Regards,
Stojan

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