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Mk6 1.6 Tdci Cold Rough Idle

Cold Idle Rough Idle Cold Start

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#1 stevehk

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Posted 18 January 2013 - 09:21 AM

Hi Chaps,

Apologies if this is placed somewhere else, but I have just bought an 06 1.6 TDCi Zetec S fiesta.

When started in the morning it seems to have a rough idle with some minor smoke on start-up, drives fine and within 20-30 secs it idles fine, no problems when its warm.

I checked the menu on the dash display, it doesn't appear to have any fault codes on there, but one thing I have noticed, I have never seen the glow plug light illuminate during starting.

Next step for me is to run some injector cleaner through the system, but has anyone had similar problems ?

Thanks,

Steve

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#2 DieselPig

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Posted 18 January 2013 - 09:34 AM

Could be the fuse blown on the glowplug circuit or the glowplug relay. How many miles has the car done?

#3 stevehk

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Posted 18 January 2013 - 09:36 AM

Hi Mate,

Its roughly 51,000, I did a lamp check to try and find where on the dash the glow plug indicator sits, the lamp does show on the test. But of course that could just be the lamp circuit.

#4 DieselPig

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Posted 18 January 2013 - 09:38 AM

Put the lamp across the glowplugs see if they get power when you turn the ignition on. If they do the glowplugs may have blown.

#5 stevehk

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Posted 18 January 2013 - 09:41 AM

Hi sorry, I meant lamps on the dashboard, I haven't been under the bonnet yet.

Off hand do you know where the glowplug fuse and relay is within the car, i'll check that first.

#6 DieselPig

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Posted 18 January 2013 - 09:49 AM

Should be in the box under the bonnet on the right hand side if I remember correctly.

#7 stevehk

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Posted 18 January 2013 - 09:57 AM

Great thanks very much for your help, out of interest do you have any idea when the glow plugs should normally come on ?

#8 DieselPig

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Posted 18 January 2013 - 10:05 AM

On my current 2011 Fiesta and my old 2003 Mondeo & 2005 Fiesta the dashboard light always came on, the ECU should check the engine temperature and power the glowplugs up accordingly. So if the engines hot no need to power them.

Don't know what the threshold temperature is maybe someone on the forum knows.

#9 stevehk

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Posted 18 January 2013 - 12:31 PM

Heya,

Just had a very helpful call from Vospers (Ford Dealer down my way), they asked the kind of runs i'm doing in the car, i'm doing fairly short 10mins runs to work, (no idea what the previous journeys were like). The chap then immeadiately pointed me to the EGR valve and suspected its was clogged, which would explain the rough idle (it was hunting above the normal idle point, rather than under) and the smoke puff on start-up.

He recommended to run it 2.5k rpm for 10mins, get the system hot to clear it, once a week, so I will go for that at the weekend. He also pointed me to diesel grades, again no idea what the previous owner used, but its now running on V-Power diesel.

I also asked about glow plugs, he said they would be unlikely to come on unless it reaches -2, even then they may not be needed.

Thanks for your help.

Will post outcome.

Steve

#10 DieselPig

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Posted 18 January 2013 - 01:12 PM

Having owned a variety of Ford diesels that won't clear a blocked EGR valve, the only way to clear it is to remove and clean the muck off by hand, a very dirty job.

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