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

Share your FORScan experience with other users

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

Postby 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 2407 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 2407 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 2407 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).
Posts: 1
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

Postby 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.
Blinded_EGR_causes_Load.png (24.63 KiB) Viewed 2034 times
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

Postby stojanhu1981 » Fri Nov 18, 2016 11:45 am


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. ( ... 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.

Posts: 1
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

Postby hojland » Tue Jan 16, 2018 3:08 pm

Have you fixed the problem. Mine dos the same
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

Postby 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.
Posts: 113
Joined: Mon Feb 06, 2017 3:00 pm
Vehicle: ford focus 16 zetec


Return to Diagnostics and Maintenance using FORScan

Who is online

Users browsing this forum: No registered users and 4 guests