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  #1  
Old 02-20-2006, 01:15 AM
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Glow Plugs

I'm wondering how long can one expect glow plugs to last for? And what would be the symptoms that would tell me that they need to be replaced?

Thanks

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1981 300 SD Turbo 390,000 miles
My mom's father-in-law bought it new, then my mom's husband had it for a while, and now it's mine. First week I had it someone hit the drivers door and took off! Other than that the body is great. As for the interior, the backseat needs to be redone and a couple of minor things. I love that iconic big body Benz look. My goal is to get it back to it's original posh condition. Thanks in advance for the help.
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Old 02-20-2006, 01:24 AM
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I haven't owned mine long enough to know how long they last in our cars. I read on here somewhere that 2-3 years of daily use is when they tend to start going bad.

When I was in the Navy, I was replacing glow plugs on Hummvees (with the craptacular 6.2 engine) pretty often, even though they rarely had over 30,000 miles on them. I think they were built by the lowest bidder.

Symptoms of bad glow plugs:

The short answer is that if it runs fine once warmed up, but doesn't like to start when cold, glow plugs are the first thing to check. Something else you may see is the glow plug light on the dash "short-cycling." When you have some bad plugs, the light will come on briefly and go out when getting ready for a cold start, rather than coming on solid and staying lit for 20 seconds or so.

Some glow plugs are better than others. The Autolites are said to be not good. Others on this forum have recommended Bosch or Beru for replacements. I went with Bosch for the two that were bad on mine when I bought it. That was five months ago. So far, so good.
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Old 02-20-2006, 01:29 AM
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thx
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1981 300 SD Turbo 390,000 miles
My mom's father-in-law bought it new, then my mom's husband had it for a while, and now it's mine. First week I had it someone hit the drivers door and took off! Other than that the body is great. As for the interior, the backseat needs to be redone and a couple of minor things. I love that iconic big body Benz look. My goal is to get it back to it's original posh condition. Thanks in advance for the help.
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Old 02-20-2006, 01:35 AM
ForcedInduction
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On my one engine, I have replaced about 8 glowplugs in two years. 5 when I first got the car as preventive maintenance and 3 as time went by. I've even left them on twice (manual control) to the point the battery didn't have enough juice to run the clock! All of them still work with an average of 0.9-1.2ohms each.

The main symptom that one needs to be replaced is when you suddenly have a "dead" cylinder on a cold start that goes away after 15-60 seconds of running. Another is a very short glow light (1-2 seconds) when the engine is stone cold.

Testing: (1) test them with an ohm-meter. Around 1ohm is good, but not more than 2ohms. (2) pull them out and bench test them (See pictures).
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Old 02-20-2006, 02:16 AM
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Smile Welcome.

Quote:
Originally Posted by New 2 Benz
I'm wondering how long can one expect glow plugs to last for? And what would be the symptoms that would tell me that they need to be replaced?

Thanks
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Last edited by whunter; 02-20-2006 at 02:42 AM.
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Old 02-22-2006, 04:07 AM
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Quote:
Originally Posted by New 2 Benz
I'm wondering how long can one expect glow plugs to last for? And what would be the symptoms that would tell me that they need to be replaced?

Thanks
Great, you have jynxed me. Now I've got 1 bad glow plug and a dead cylinder for the first minute or so of idle.

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