190d glow plug question - Mercedes-Benz Forum
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#1 (permalink) Old 01-11-2009, 04:54 PM
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190d glow plug question

My car has had trouble starting in the cold. I had no light come on for glow plugs.

I tested the relay as this page explains (up to testing the fuse mid page)

Mercedes Diesel Glow Plug Repair

In Cyl #1 i have a no ohm reading. The plug or wire may be the cause. I do not have time tonight to investigate further but came upon a weird discovery. Unplugging the relay connection



The glow plug light in the dash came on and went off after apx 3-4 sec.

Any idea why this is? I thought the light was supposed to come on while starting and connected.

Last edited by jsbarks; 01-11-2009 at 04:58 PM.
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#2 (permalink) Old 01-11-2009, 09:13 PM
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If the glow plug indicator lamp on the dash doesn't come on when turning the key to position 2, then there are two likely possibilities. The most likely possibility is you're glow plug relay fuse has fried the center connection gap due to a shortage. Then the other could be the relay itself.

Since cylinder 1 is not getting a reading it's probably shorted, that would cause the fuse to blow. Check the wiring to ensure the wire leading to the cylinder 1 is not touching anything but the end of the glow plug. And make sure the glow plug itself works. It'll be a lot easier to just replace them all while you're testing cylinder 1's glow plug.

Whatever you do, if you discover the GP relay fuse is blown, don't bridge it with a foreign metal object. And don't use ether to start the engine unless you want a nice knock. ha
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#3 (permalink) Old 01-11-2009, 10:39 PM
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I think the glow light fails to come on also when one or more glow plugs is bad. The relay still energizes the other plugs, but the light stays out to inform you that there is a fault. That seems to be the way mine works. '87 190D
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#4 (permalink) Old 01-11-2009, 10:40 PM
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Oh, and my car starts pretty well even on a cold day when one glow plug is bad. Starts acceptably when two are bad. Not so good when the third one goes! You may have guessed that I now have five new ones in place.
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#5 (permalink) Old 01-11-2009, 11:56 PM
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hi JSBARKS,

i have a 1992 190d and on mine when a glowplug stops working the light dosent come on when you turn the key but then comes on 5 seconds after and when you start the car it stays on for 30 seconds then goes off,

i test the glow plug circuit a different way , all i do is get a test light or volt meter ,
all you do is disconnect the plug like in the pic at the top of the page , and then put 1 side of your test light or meter to the battery + , and the other to each connection inside the plug itself "not the relay" . and if you get a voltage reading or lamp lights then you have a circuit, which means that the glow plug and wire is working, saves taking them all out 1 at a time, as some are a bugger to get to.

if all are ok then you have a more serious problem else where,

hope this helps a little

Ant
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#6 (permalink) Old 01-13-2009, 03:11 PM
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well i picked up 4 bosch glow plugs

how do I install them?
I've read about reaming ect...
What else needs to be done?
How long does it take on the 190?
thanks!
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#7 (permalink) Old 01-13-2009, 11:58 PM
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very simple to replace them ,

first locate where they are.
undo the cable from the top of glow plug
undo and remove glow plug.

replace in reverse order ,

just be careful not to cross thread them , try to tighten them by hand then just pinch them up with a socket.

then job done .

did all 5 of mine in 30 minutes on my 2.5d , 2 of them were a pain to get to .

Ant
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#8 (permalink) Old 01-15-2009, 08:15 PM
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They are a super pain to get to. I'm not even going to try. I'll take it to the mechanics tomorrow.

I wish I had the tools too...I need the U-Joint and extension and 1/2->1/4
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#9 (permalink) Old 01-15-2009, 11:28 PM
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i have the tools you can borrow .,
just a pitty your 1000's of miles away.

good luck

Ant
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#10 (permalink) Old 01-16-2009, 06:27 AM
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i'll swim over and swim them back.Dont blame me if they become rusty with saltwater!
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