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Old 25-01-2019, 12:10 AM   #1
Faolan
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Unhappy MC Mondeo Tdci -misfire?

Drove from Syd back to Canberra. First set of lights the engine felt lumpy.
Stopped at 2 more sets and definitely something wrong.
Got home, put car in Park, when I got out of the vehicle it was as if I could smell burning, the engine was seeming to misfire, the fan was running strongly.
When I revved the engine it seemed to smooth out, but at low rev's it definitely seemed to be misfiring.
The coolant temp was normal, smack bang in the middle of the range.
Fuel economy seemed normal for the run, power didn't seem down- but then it sits on 2.2k rpm all the way along the Hume Fwy.

Any guesses?
I will have to locate a mechanic - don't want to go to Ford after the tranny disaster (it still whines accelerating or engine braking)- but hate going in blind.
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Old 25-01-2019, 05:54 AM   #2
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Default Re: MC Mondeo Tdci -misfire?

Does it drive OK now? Maybe a DPF regen gone wrong?
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Old 25-01-2019, 07:32 AM   #3
Faolan
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Default Re: MC Mondeo Tdci -misfire?

Went out and started it this morning.
Seems fine.
Perfectly happy at idle.
Will go for drive a little later.
Hope I just interrupted a DPF regen
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Old 25-01-2019, 09:10 AM   #4
Faolan
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Default Re: MC Mondeo Tdci -misfire?

went for a little test drive.
seems happy.
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Old 25-01-2019, 12:51 PM   #5
Mondaveo
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Default Re: MC Mondeo Tdci -misfire?

Sounds like a regen to me. The telltale would have been the instantaneous fuel consumption when you were stationary. Normally idling will read around 1.1L/hr (with a/c on), while undergoing a regen it will be well higher. That and the raging fan and generally noisy idle as heard from outside the car.

I've seldom noticed when my car does a regen, but the one time I was sure of it was on a trip when I arrived at a rest stop and noticed the car at idle sounded loud from outside, and the consumption was up as above.
On one other occasion in Sydney I felt the car seemed rough when stopped and accelerating from traffic lights, and in hindsight I think that could've been a regen in progress.

I wish Ford had fitted an indicator of some kind to take the guesswork out.
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Old 25-01-2019, 08:11 PM   #6
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Default Re: MC Mondeo Tdci -misfire?

I've had a number of regens happen after long motorway trips. I expect the engine load at a constant 110 km/h isn't enough to keep the DPF clean.
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Old 28-01-2019, 09:01 PM   #7
bundybear75
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Default Re: MC Mondeo Tdci -misfire?

Quote:
Originally Posted by Faolan View Post
Went out and started it this morning.
Seems fine.
Perfectly happy at idle.
Will go for drive a little later.
Hope I just interrupted a DPF regen
Have you the facility to scan for error codes?

That may point you in the right direction.

At least you can see where the dpf levels are at, i know mine burns every 120-150 km highway driving.
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Old 29-01-2019, 08:57 AM   #8
Faolan
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Default Re: MC Mondeo Tdci -misfire?

it was fine over the weekend around Canberra.
Came up to Sydney last night. First couple of lights near Bankstown was doing it again. Cleared up by the time I got to Newport. Hoping it is a regen and not heat (hot day/engine) related.
Haven't noticed it (the rough idle) ever before.
Ah well, getting my timing belt changed in the next few weeks, will get them to have a sniff around. Particularly around the DPF injector, make sure its functioning properly.
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Old 29-01-2019, 09:11 AM   #9
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Default Re: MC Mondeo Tdci -misfire?

Quote:
Originally Posted by Faolan View Post
it was fine over the weekend around Canberra.
Came up to Sydney last night. First couple of lights near Bankstown was doing it again. Cleared up by the time I got to Newport. Hoping it is a regen and not heat (hot day/engine) related.
Haven't noticed it (the rough idle) ever before.
Ah well, getting my timing belt changed in the next few weeks, will get them to have a sniff around. Particularly around the DPF injector, make sure its functioning properly.
When I had issues with my DPF fuel vaporiser, the only indication was the malfunction warning and then error codes obtained using Forscan. Apart from that the car drove as normal.

If your timing belt is due maybe it is a timing issue (stretched belt maybe??) but unlikely?

Definitely worth getting a scan for error codes. I work in Canberra area so if needed I could scan it for you if your timetable crosses mine. PM me if needed
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2012 MC Mondeo LX TDCi Wagon - Highway Hack 392K km and counting - Now gone 😢
2008 Peugeot 308 HDi - Highway Hack II
2008 Citroen C4 HDi - Highway Hack III
2010 Peugeot 308 HDi SW - Shaggin Wagon II
2016 VDJ200R Landcruiser GX Wagon - TTD V8 Power !
2017 Toyota RAV4 GX Wagon - Shopping trolley - Gone
2022 Volvo XC40 T4 Inscription - Shopping trolley II
2002 BMW R1150GS
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Old 28-02-2019, 02:04 PM   #10
Faolan
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Default Re: MC Mondeo Tdci -misfire?

problem has gone away.
Hoping just interrupted a regen.
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