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Ford Mondeo 2.0 2002 - Rust coloured deposits on plugs #

Posted by Pete Mutlow on May 6, 2014, 4:51 pm

Year of Manufacture *: 2002
Engine Size and Code *: 2.0ltr
( Optional ) Scanner Used: n/a
( Optional) Fault Codes: None

Greetings,

A quick and easy one for those who may know. I am current investigating a sporadic misfire on this Mondeo and I am currently puzzled at the condition of the spark plugs. They are newly fitted correct NGK plugs and after about a week, the electrodes have very rusty coloured deposits. My research tells me that it is due to antiknock additive in petrol. Can anyone verify this please. It is not something I often see.

Regards

Pete M

Re: Ford Mondeo = Rust coloured deposits on plugs

Posted by Tony Ludford <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5539' width='330' height='300' border=0 style='border:none;'> on May 6, 2014, 8:27 pm, in reply to "Ford Mondeo = Rust coloured deposits on plugs"
Tony Ludford

Not sure how relevant it is , but these are prone to sticking piston rings causing plug-fouling.

Re: Ford Mondeo 2.0 2002 - Rust coloured deposits on plugs #

Posted by Chris Angus <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5111' width='330' height='300' border=0 style='border:none;'> on May 9, 2014, 10:41 am, in reply to "Ford Mondeo 2.0 2002 - Rust coloured deposits on plugs #"

There was an example of this in a competition I did some years ago, and it was due to fuel additives and would have a negative affect on ignition, som you could be right.

Also check the lead insulation and plug for signs tracking, that could be your fault, does it missfire during a WOT rev?

Re: Ford Mondeo 2.0 2002 - Rust coloured deposits on plugs #

Posted by Mark Robins <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3563' width='330' height='300' border=0 style='border:none;'> on May 9, 2014, 12:41 pm, in reply to "Re: Ford Mondeo 2.0 2002 - Rust coloured deposits on plugs #"
Mark Robins

I remember using Bardahl octane booster years ago and getting the exact same effect on the plugs.

Re: Ford Mondeo 2.0 2002 - Rust coloured deposits on plugs #

Posted by pete Mutlow <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1569' width='330' height='300' border=0 style='border:none;'> on May 9, 2014, 9:00 pm, in reply to "Re: Ford Mondeo 2.0 2002 - Rust coloured deposits on plugs #"
Peter Mutlow

Thanks for your inputs guys. It would appear that the deposits is a red herring and I can discontinue that route.

I have come across many Mondeos with mis-fires before which been tracked down to the usual plugs, leads, coil or valve stick problems. Unfortunately it never manifests any problems when I attend and the misfire is very random. I intend to put this one on the back-burner until it gets worse or the EML illuminates. I will not advocate throwing parts at it until I have something positive to go on.

My post was specifically about the plug deposits and that has been answered for which I thank you all for your kind interest and input.

Regards

Pete M

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