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Slightly Lumpy Idle


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#1 GavChap

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Posted 31 July 2012 - 03:08 PM

My 100HP 1.6 litre petrol (2005) seems to be a little bit lumpy on idle, nothing major, but you can feel the inconsistent idle through the floor.

Is this normal or maybe is something else wrong? MAF? Ignition leads? It did have the water down the plug hole problem, but that's been fixed and plugs changed.

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#2 Jay Ali

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Posted 31 July 2012 - 09:03 PM

My 1.8 mk2.5 does the same but mine has never had any other issues
Some help would be greatly appreciated ;)

#3 Jay Ali

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Posted 31 July 2012 - 09:04 PM

My 1.8 mk2.5 does the same but mine has never had any other issues
Some help would be greatly appreciated ;)

#4 Jamie Gwilliam

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Posted 01 August 2012 - 12:01 AM

Id guess a few things. Maybe low battery power, idle cotrol valve, a blocked filter, low oil, blocked breather pipe(s), gunky throttle body, 'a clutch related thing', (ie clutch sticking causing engine to struggle), engine mounts (ie vibrations if worn out), or 1st sign of gasket failure (possibly).

#5 GavChap

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Posted 01 August 2012 - 09:38 AM

My 1.8 mk2.5 does the same but mine has never had any other issues
Some help would be greatly appreciated ;)


Actually, thinking about it, previously to my 2005 1.6, I had a 2008 1.8, and that felt lumpy too, perhaps it's a ford thing?

#6 btmaldon

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Posted 01 August 2012 - 11:13 AM

Its not a Ford thing and it shouldn't run lumpy. It may be getting air in the intake system which is making it run lean. I would check all the vacuum hoses for leaks/splits initially. A blocked injector would also cause this on idle, so it may be worth putting some redex in the tank and cleaning the fuel system through.

When was the fuel filter last changed? Should be every 25k miles if I remember rightly.

#7 greggp

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Posted 01 August 2012 - 12:27 PM

My 1.8 (2008) when idle I can feel mild vibrations in the cabin, it is more noticeable when its warmer outside too. I understand these vibrations are due to the engine working to reduce emissions, my rev needle actually sits in a different position when its warmer i.e. 18 deg c externally than say when its 5deg c! I put my dash instrument panel into diagnostics mode and you can view the RPM digitally and while engine is running its fluctuating between 600-750RPM. Mine has been into fords numerous times and I raised concerns regarding this but they say its normal! hopefully this is the same sympton you're experiencing because its nothing to worry about...

#8 greggp

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Posted 01 August 2012 - 12:30 PM

In addition to the above, I only notice these vibrations on idle during summer warmer months and not cold conditions! Have you only just noticed this since temperatures outside have been warmer....

#9 GavChap

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Posted 01 August 2012 - 01:44 PM

In addition to the above, I only notice these vibrations on idle during summer warmer months and not cold conditions! Have you only just noticed this since temperatures outside have been warmer....


I've only had the car in warmer weather, got it about 1 month ago.

#10 GavChap

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Posted 01 August 2012 - 08:28 PM

Just noticed tonight that it seems to wobble up and down from around 720 to 800 rpm when idle using the dash trick to show you real numbers. There's a cut on the boot of one of the plug at the coil pack end, so wondering if I should change those, it seems someone's changed one of the leads before as I have 2 marked as number 1 in the set.

Anyone know the price direct from Ford?

#11 GavChap

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Posted 08 August 2012 - 01:07 PM

Changed the leads, no change. :(

Here's a video of the engine idling, is this normal? You can see it running slightly lumpy.



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