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1959 220S cabriolet, 1983 240D original owner, 1999 E300 turbo diesel, 1988 560SL, 2003 SLK320
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3,513 Posts
Discussion Starter #1
For the past month or so there has been a slight rough idle for a few seconds when I start the car. Finally yesterday I got around to checking the glow plugs. Turns out #3 is reading bad. All the others were reading about 0.8 ohms. Interesting thing is that I had no check engine or glow plug light on. This is the second time I had one plug go bad and got no warning lights. Once I had two plugs bad and did get both the check engine and glow plug light.

So I will soon see if my theory holds up about how easy the plugs are to remove on a hot engine with anti-seize lathered plugs.

I just checked my records and I have replaced glow plug #3 twice in the past 18 months, but both times with good used glow plugs. It's been a really long time since I replaced them all with new ones. Since I've got new ones on hand, maybe I'll just replace them all and keep the good used ones for spares.
 

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E250 Bluetec Sprinter250 Bluetec
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36,982 Posts
Good luck. I am watching the GP topics as our first E300DT has still the same we bought it with almost 70,000 miles ago. The other E300DT come with no records but at 255k on odometer I think I have good chance to have a GP going bad soon.
 

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E300TD 1997 W210 Running on WVO and a % of dino...
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1,206 Posts
This is what I do too, I change them all at once and keep the old one as spare.
Then if one burn I use an old one, but usually they don't last that long.
Bosch Duraterm were the best buy for me.
 

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1959 220S cabriolet, 1983 240D original owner, 1999 E300 turbo diesel, 1988 560SL, 2003 SLK320
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3,513 Posts
Discussion Starter #4
Well, I'm sticking by my story - change your glow plugs on a hot engine and use a generous amount of anti-seize. I got to my bad plug yesterday and just changed them all. Did it on a hot engine and they all broke free rather easily and all came out with no issues. Reamed the holes about three times before the carbon seemed to clear up. Also cleaned out the manifold. It cleaned up very easily with just carb cleaner since I had done it about a year and a half ago and it wasn't very bad this time around. Also replaced a few of the broken plastic injector line clips while I had access to them.
 

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Current 2008 320ML CDI. Previous 1998 E320, 2007 E320 Bluetec
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2,515 Posts
Sokoloff, did that cure the slight rough idle?
Any thoughts as to why the same GP (#3, IIRC), wore out sooner?
Skippy


Sent from phone.
 

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1959 220S cabriolet, 1983 240D original owner, 1999 E300 turbo diesel, 1988 560SL, 2003 SLK320
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3,513 Posts
Discussion Starter #6
There was just a little bit of stumbling and rough idle upon starting it cold. I'll bet that most would not have even noticed it - I know my wife didn't. That appears to now be gone. Not sure why glow plug #3 has conked out on me twice in 18 months. Maybe using used glow plugs was not a great idea? Maybe it gets more carboned up on my car for some reason? Just don't know.
 

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E250 Bluetec Sprinter250 Bluetec
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36,982 Posts
Could be that you just had bad luck with replacement?
I am still thinking why I don't have GP going bad? Where we live, we do have about 20 mornings with frost every year. It sure is not -20F like I have seen in Dakota, but GP still do some work here.
Other thing I notice the W210 have slow warming GP. Those take about 10 seconds for the light to go off, while on W124 diesel the light goes off in 3 sec.
 
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