cls glow plug module

[clspaul]

hello people,im new to this forum and im looking for some advice,i have an o8 cls 320 cdi v6 facelift model and my question is about the glowplug module,is it somthing i can change myself or do i have to take it to mercedes to get it changed? is it connected to the ecu? ie. does it need to be reprogrammed if i replace it with a new module or can i just swap it out myself? any any help would be greatfully recieved thanks

 

[S.Speed]

Hi Paul..
I did my own about 3 weeks ago and yes it is something you can do yourself.
You will need a torx set for the bolts..
I cant remember the size and I cant check for you as my car isn't with me at the moment.
Do you know where the Relay is located on the V6 or do you want me to send you a photo ?
Its plug and play and NO recoding is needed.

Photo attached of the location.
You remove the engine cover by pulling upwards..

 

[clspaul]

thats brilliant,thanks for your help,i will order the module and hopefully have it done somtime next week now that i know it dont need recoding

 

[mersum1es]

Remember, if there is a faulty plug it may fry the new control box right after installation.

Here some control module DIY repair (you may open the faulty one after you've changed it):
http://forums.mercedesclub.org.uk/showthread.php?t=80809&page=2

 

[S.Speed]

Remember, if there is a faulty plug it may fry the new control box right after installation.

Here some control module DIY repair (you may open the faulty one after you've changed it):
http://forums.mercedesclub.org.uk/showthread.php?t=80809&page=2

I tested all my glow plugs and all were reading below 1ohm..
That means they were all ok.
It certainly started readily enough the following morning.

 

[mersum1es]

S.Speed, In your case that was ok, OP has not stated why he wants to change module, what are symptoms etc...

These V-engines are known to have difficult glow plug diagnosis, even measuring resistance will not always pin point faulty plug. That's the reason why usually all plugs are recommended to change at once.

 

[virin]

what if i keep driving like thid

 

[onefortheroad]

what if i keep driving like thid

?? Explain.

 

[Wighty]

?? Explain.

I was equally stumped

 

[Blobcat]

He's asking if he’ll damage his engine if his glow plugs aren’t working (I’m surmising)

 

[Wighty]

He's asking if he’ll damage his engine if his glow plugs aren’t working (I’m surmising)

Your guess is 3x longer than his statement (but you are probably right )

 

[Blobcat]

Your guess is 3x longer than his statement (but you are probably right )

(I read his other post...)

 

[Wighty]

(I read his other post...)

That is why you are one of the "forum grande fromages " , and I'm one of the worker chumps

 

[Oldspanners]

I found this video excellent on the glow plugs and module on the OM642 although it's on a Jeep it's the same.

 

[virin]

He's asking if he’ll damage his engine if his glow plugs aren’t working (I’m surmising)

You guessed it right.Will i harm something if i use the car with following condition:Glow light on before starting ,goes off after engine fire,comes back immediatly and goes off after 15 secs.Never comes back again in to this cycle once engine is warm.Will this damage something in the car????Now dont call this 6x guys

 

[Wighty]

You guessed it right.Will i harm something if i use the car with following condition:Glow light on before starting ,goes off after engine fire,comes back immediatly and goes off after 15 secs.Never comes back again in to this cycle once engine is warm.Will this damage something in the car????Now dont call this 6x guys

The cdi engines use the glow plugs when the car is running as well , not just at start up , so yes it will not allow maximum efficient combustion ? I wouldn't call this "damage" but if you intend to keep the car long term I would get the repairs done .

 

[virin]

The cdi engines use the glow plugs when the car is running as well , not just at start up , so yes it will not allow maximum efficient combustion ? I wouldn't cause this "damage" but if you intend to keep the car long term I would get the repairs done .

Thanks buddy

 

[onefortheroad]

Im selling a used relay for £30 if interested..

 

[matthew k]

My glow light stays on, (om642) this is after I changed the module too, so one or more of the plugs is knackered. Given the risk of one or more snapping in the head, (they're very thin) I've decided to leave it until I notice an issue, it starts very nicely and idle smoothly, even below freezing.

Now this probably isn't considered 'best' practice, but until I notice a problem, lumpy idle, white smoke maybe, I'm not risking it.

Make sure who ever tries to change them if that's what your going to do gets the engine really hot beforehand, I understand that reduces the chance of them breaking, others will advise though hopefully to confirm.

 

[virin]

My glow light stays on, (om642) this is after I changed the module too, so one or more of the plugs is knackered. Given the risk of one or more snapping in the head, (they're very thin) I've decided to leave it until I notice an issue, it starts very nicely and idle smoothly, even below freezing.

Now this probably isn't considered 'best' practice, but until I notice a problem, lumpy idle, white smoke maybe, I'm not risking it.

Make sure who ever tries to change them if that's what your going to do gets the engine really hot beforehand, I understand that reduces the chance of them breaking, others will advise though hopefully to confirm.

Yes I too have faced such issues.removing one that is stuck is risky.I changed 5.light goes off now.But now light is on for 2 seconds before starting.Isnt it too less?