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  #1  
Old 12-03-2009, 06:23 PM
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glow plug light comes on, then I hear a belt screech

I don't know if this was just a coincidence, but my glow plug light came on for a couple of seconds about 3 minutes after I started driving the car from a cold start, then I heard a screeching sound from the engine. The screeching was temporary. It sounded like a belt, so I checked to see if coolant had leaked from the cooling system 5 minutes later when I got home. The alternator belt felt very dry, maybe I should change it soon, since I don't know how long it's been on there. Is it possible that I'm having alternator issues that are affecting the glow plug relay, or light?
Also, I have an afterglow relay and glow plug wires in my garage that I've been meaning to put into this car. I've already upgraded to pencil type glow plugs by removing the ground wire from the first glow plug. Does anyone know the wiring involved to complete the upgrade? Thanks

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  #2  
Old 12-03-2009, 06:47 PM
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You have a dead plug I believe.
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  #3  
Old 12-03-2009, 07:15 PM
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Really? These Bosch plugs are only a month old. I'll check for loose connections at the plugs.
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  #4  
Old 12-03-2009, 07:39 PM
Craig
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Either that or the relay is acting up and it kicked the GPs on while you were driving. The extra load on the alternator could account for the slipping belt.
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Old 12-03-2009, 07:44 PM
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^^^^What He Said.......
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  #6  
Old 12-03-2009, 07:51 PM
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I think vise versa, your alternator / regulator is acting up, the belt is not helping, and your charge voltage went low, and some indicators lit on your dash. I've seen a few of the "sensitive system" indicators (SRS, lamp out indicator, etc.. ) flicker a bit when weird voltage issues hit.

In my case, the starter did not dis-engage, and was acting like a generator until finally it chewed its brushes... this lit some unexpected lamps on the dash. Just voltage related issues, not issues with the indicated system.
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  #7  
Old 12-03-2009, 10:14 PM
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Quote:
Originally Posted by otto huber View Post
I don't know if this was just a coincidence, but my glow plug light came on for a couple of seconds about 3 minutes after I started driving the car from a cold start, then I heard a screeching sound from the engine. The screeching was temporary. It sounded like a belt, so I checked to see if coolant had leaked from the cooling system 5 minutes later when I got home. The alternator belt felt very dry, maybe I should change it soon, since I don't know how long it's been on there. Is it possible that I'm having alternator issues that are affecting the glow plug relay, or light?
Also, I have an afterglow relay and glow plug wires in my garage that I've been meaning to put into this car. I've already upgraded to pencil type glow plugs by removing the ground wire from the first glow plug. Does anyone know the wiring involved to complete the upgrade? Thanks

Sounds like you have a loose alternator belt. Replace the belt if it's cracked and tension it correctly and you shouldn't get that belt screech under a heavy elec. load anymore.
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Old 12-04-2009, 10:25 AM
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On my SD the glow plug light would come on occasionally while driving. Turned out the GP relay was bad and may have been the cause of why I went through 3 alternators in a short period of time. I replaced the relay with the new style afterglow and the light has behaved as normal since and no more charging issues.

If the light comes on again while driving, this is the route I would take. On all my tests in the garage the GP relay seemed like it was working but clearly wasn't.
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  #9  
Old 12-04-2009, 10:38 AM
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My 240 does the same thing I also have the upgraded plugs. Its the altenator belt it does it only after start up . Its your belt saying " I'm giving it all I got" try tightening it or replace.
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  #10  
Old 12-04-2009, 02:50 PM
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Thanks guys,

I have an afterglow relay from an '82 240D in the garage which I will replace my current relay with. I've done a search, and there are plenty of instructions for the Bosch afterglow relay, but not the OEM relay from a later model. Does anyone have a link to that swap? Thanks
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  #11  
Old 12-04-2009, 02:53 PM
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Originally Posted by otto huber View Post
Thanks guys,

I have an afterglow relay from an '82 240D in the garage which I will replace my current relay with. I've done a search, and there are plenty of instructions for the Bosch afterglow relay, but not the OEM relay from a later model. Does anyone have a link to that swap? Thanks
I'm not familiar with your model but I believe the relays are interchangeable. It should be just pull the old one out put the new one in and hook everything up the same.
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1998 E430
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1980 300SD
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  #12  
Old 12-04-2009, 03:04 PM
Craig
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Originally Posted by Graplr View Post
I'm not familiar with your model but I believe the relays are interchangeable. It should be just pull the old one out put the new one in and hook everything up the same.
Yup, I believe it is just "plug and play," I have one in my 300D and it helps cut down on the smoke considerable for the first couple of minutes.
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  #13  
Old 12-04-2009, 04:41 PM
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The '82 relay mounts to the front left fender. So you're saying I can just splice the wires coming from under my dash and connect them to the wires on the '82 relay?
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  #14  
Old 12-04-2009, 04:45 PM
Craig
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OPs, I didn't realize we were talking about a 79. Do you have the old style GPs?
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Old 12-04-2009, 06:56 PM
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Quote:
Originally Posted by otto huber View Post
The '82 relay mounts to the front left fender. So you're saying I can just splice the wires coming from under my dash and connect them to the wires on the '82 relay?
Hmmm...like I said, I'm not familiar with your model.

I thought the 79s had the same type relay. Apparently is doesn't. Here is a link to Fastlane with what the relay looks like- http://catalog.peachparts.com/ShopByVehicle.epc?q=&yearid=1979%40%401979&makeid=63%40%40MERCEDES+BENZ%40%40X&modelid=6139%3AMBC%7C1489%3AED%7C10000129%40%40240D&keyword=glow+plug&subcatid=P:240809@@Glow+Plug+Kit&mode=PA

It doesn't look the same as the one on my SD, so I don't know if you can make it work or not. Sorry.

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