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[Sir Tigger KC]

The glowplug light on my Merc comes on and goes out as it should, but then comes on again for a short while when the engine's running.... 

Would this be an indication of a glowplug starting to fail? or failed??   

Thanks! 

[Sir Tigger KC]

Yep just had a peruse of the Mercedes forums and it looks like a glowplug has failed....    Apparently they are easy to shear off when removing....    but the good news is that I can get a set for £35! 

[omega3000]

Yep just had a peruse of the Mercedes forums and it looks like a glowplug has failed....    Apparently they are easy to shear off when removing....    but the good news is that I can get a set for £35!

Nice one , nice cheap fix 

[tidla]

Yep just had a peruse of the Mercedes forums and it looks like a glowplug has failed....    Apparently they are easy to shear off when removing....    but the good news is that I can get a set for £35!

Nice one , nice cheap fix 

As long as you go gentle with plenty of plusgas.

[waspy]

Apparently they are easy to shear off when removing.... 

Run the engine before hand, get it nice & warm all through. This should help big time

[Sir Tigger KC]

Yep just had a peruse of the Mercedes forums and it looks like a glowplug has failed....    Apparently they are easy to shear off when removing....    but the good news is that I can get a set for £35!

Nice one , nice cheap fix 

As long as you go gentle with plenty of plusgas.

I've never used Plusgas, is it better than WD40? 

[Sir Tigger KC]

I was looking through the service history and noticed that the glowplugs were changed in February, so I found a second hand glowplug relay and fitted that instead, but it hasn't made a difference... 

Is it possible/likely that a glowplug has failed in such a short time?    I suppose it's possible that my second hand relay is no good, but the guy said it'd been tested and he was pretty helpful... so... 

[Marks DTM Calib]

The fault indicates a failed glow plug.....just because they were changed six months ago does not mean they are ok 

Also, fit GOOD ones e.g. Beru or similar

[Sir Tigger KC]

OK Thanks Mark! 

[Andy B]

.....
I've never used Plusgas, is it better than WD40? 

Much better. Plusgas is a penetrating fluid/oil, WD40 by its title is a water disperser. 

[tunnie]

.....
I've never used Plusgas, is it better than WD40? 

Much better. Plusgas is a penetrating fluid/oil, WD40 by its title is a water disperser. 

Got some here and yes its much better, bit pricey though 

[Omegatoy]

and Duck oil is better than both!!!

[Andy B]

and Duck oil is better than both!!!

Not sure I'd agree     
The 'best' penetrating oil used to be Easit, but it doesn't seem to be around any more. 

[Andy B]

.

[Andy B]

.....
I've never used Plusgas, is it better than WD40? 

Much better. Plusgas is a penetrating fluid/oil, WD40 by its title is a water disperser. 

Got some here and yes its much better, bit pricey though

Never bought any in my life!