glow plug temperature sensor?Where is it?

[Olivier]

Hello,
the dreading glow plug light come on again after I started the engine...
The glow plugs are only 2 month old.
I have checked them from the relay with a light tester and there is current going through them, I don't have a multimeter therefore cannot get the reading on them but none are broken apparently.
I switch the glow plug relay with my old one, same story.
Now after all this I am thinking that this could be a bad wataer temperature sensor that tells the relay how long the light should go on.
Any idea where is this sensor on the engine?
What part number?
And mainly, would a faulty sensor causes this?
Thank you.
Olivier

 

[Dieselman]

It will be a glowplug down. What brand did you use?

Rig a test lamp up between the wiring plug for each plug in turn, and the +12v connection on the inner wing to test.

 

[Olivier]

This is what I did, with a screw driver with a little lamp inside, they are all working. I had to use NGK as there was no other alternative this day & I needed the car on the road ASAP.

 

[Dieselman]

I bet one is down. What's probably happened is the control coil has shorted, so it still registers as conducting, but it won't work.
If you get them out and test them on the +12v post, one may get very hot half way down instead of the tip.

Buy a digital meter, they are only a few pounds.

 

[Olivier]

Humm,I go and take the manifold off now.I hate this manifold with a passion
I'll report in an hour or so.

 

[AANDYY]

Oliver, your so intimate with your manifold, you are the expert now!

 

[Olivier]

Diesel man, did we had a bet? Not sure anymore? Did we???
OK, if we did you wan. It was one glow that was bursted. The look at the other is not goot either... And this after 3 month. I put back my old 5 BERU that after 6 month still looking great. The one that failed last time of course was alreeady a NGK. Defo not good at all. The worse is that I changed my injectors as I burned a set of glow plugs in 6 month, thought it was bad atomisation ( might have been tho?), guess what the glows were, F....ing NGK!
Now I put the last NGK at the front, hopefully I'll be able to change it without moving the manifold.
Thank you DM.
Happy weekend to all.
Suggestion of the day:
Avoid NGK glows!!! At all cost!

 

[corned]

My previous motor - a Peugeot 406 - had Beru glows. The consensus was that Pug owners strayed from Beru at their peril. Seems the same is true of MB!

 

[Dieselman]

Diesel man, did we had a bet? Not sure anymore? Did we???
OK, if we did you wan. It was one glow that was bursted.

Suggestion of the day:
Avoid NGK glows!!! At all cost!

Add Denso to that list.

 

[Olivier]

I know, I couldn't get the beru the last time and I couldn't check which one as failed or how many then I had no choice to get a whole set of wonderfull NGK...Grrr...

 

[Olivier]

By the way, anyone fancy some NGK?
30 pound for the lot, anyone?
Postage included. No?

 

[duncanh]

I changed a glow plug tonight

I put a new glow plug in my c220cdi (2002) tonight.

I will not tell you where I got it or who made it as I will get serious abuse from other members for buying a cheap one (it was not a Beru, but it was not an Ebay gamble.

The originals lasted 190,000 miles, then the warning light came on. Only one tested as faulty (using a multimeter), so I took the Scottish option and only replaced that one.

I fully expected to take out a Beru, but it was a Bosch (Bosch part no 0250202056, Mercedes part no 001 159 4801). I know it was the original as I have had the car since new.

It was glowplug no 4 (nearest the bulkhead), the most difficult one. I expect others to fail soon, but at £6 each incuding postage, I am not too worried.

The only tips I can give are:

• Make sure the engine is really hot before removing the old one
• Use a torque wrench to remove (set at less than 30nm). Beru quote the breaking torque of 35nm on their glowplugs (I set mine at 25nm and it came out)
• Put plenty of penetrating oil round the old glowplug over a few days before attempting to remove the old one.
• Set torque wrench at 20nm to install new glow plug

This worked for me.

Don't be afraid to give it a DIY attempt, it will be OK unless you are really unlucky. (Glowplug 4 on the W203 c220cdi is the most difficult as there is a diesel line and electrical cables in the way. You don't need to remove them, just carefully manoeuvre them out of the way).

(I would have taken pictures and done a DIY but time and light were against me. It was almost dark when I started, and fully dark when I finished).

Best of luck

 

[Reza]

Damn! I've just bought a set of NGK's to install tomorrow!

 

[Olivier]

Bring them back, trully, not worth the trouble to put them in.
Hey, I got a used bunch for sale...

Oh, ok, I'll take my coat...

 

[Number_Cruncher]

>>thought it was bad atomisation

There's nothing stopping that being the case again - particularly considering the abuse given to your fuel system....

But, yes, use Beru and accept no other.

 

[Olivier]

Might be, but we'll never know now. There is no abuse in the fuel system. I am actually certainly looking after the car much better then the general public. It's not shinny as I don't wash and buffer, there as been troubles/ tweakings needed to be done, but now all is good fuel wise.
I wish you come to Edinburgh to try the car performance, nothing less then diesel,0 to 60 in 9 second, slower then originatly build, but hey, I'm on veg.
I am actually a wee annoyed with that, I thought I was going faster then the original spec with the few tweak I did... I need a bigger turbo, maybe...
Olivier

 

[Number_Cruncher]

>>on WVO and top this up with 15% diesel.

I make that about 85% abuse, and 15% fuel.

 

[Olivier]

Just Pm you. we crossed text.