Trouble starting 87 190d Turbo after replacement of glow plugs - Mercedes-Benz Forum
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#1 (permalink) Old 11-02-2011, 07:31 PM
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Trouble starting 87 190d Turbo after replacement of glow plugs

Hi,

I'm not super mechanically inclined but I attempted to change my glow plugs with the help of a friend this last evening. The glow plug lights on my 87 190d 2.5 turbo diesel have been coming on and staying on after starting the engine but I had not gotten around to checking out the problem as it has been fairly warm outside. This last week or so I have not started it since it's been quite cold and so we decided to change the gp's in order to start using the vehicle again.

As those of you who own this particular vehicle may understand access to these gps are a royal pain to access. We chose to take the intake manifold off in order to get to the plugs and were able to take everything apart and put back together with relative ease. I stupidly did not take the time to find a multimeter in order to check the gps or the wires going to and from the relay to the gps. After putting it altogether, the glow plug light does not come on when I turn the key to the position just before starting the engine. In addition the engine turns over but does not want to start running.

I have replaced the intake gasket and also bled the fuel lines going into the head to make sure that the engine is getting fuel. It was a nice 60F day here in Columbus, Ohio so there is no way that it was too cold for the engine to start sans gps. Right now I am recharging the battery overnight and hoping to get a hold of a multimeter to check the gp relay system to make sure the preglow system is working. In the meantime are there any ideas as to why the engine does not want to start up?
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#2 (permalink) Old 11-02-2011, 10:04 PM
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Sounds like a short in Glow Plug lines, which has caused the fuse in the GP control module to blow
Double check all GP lines to make sure there are no shorts to ground
Pop the GP control module cover and check the fuse, it's a aluminum strip about an inch long, order from dealer.
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#3 (permalink) Old 11-03-2011, 06:34 AM
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Thanks, I will check the fuse and the lines once I get my multimeter today.
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#4 (permalink) Old 11-03-2011, 09:31 AM
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Quote:
Originally Posted by NMBMBZ View Post
Sounds like a short in Glow Plug lines, which has caused the fuse in the GP control module to blow
Double check all GP lines to make sure there are no shorts to ground
Pop the GP control module cover and check the fuse, it's a aluminum strip about an inch long, order from dealer.
I agree. Check for shorts that may be grounding from the wires going to the glow plugs. You might want to use a multimeter. Your glow plug relay fuse is likely blown because of the short.

They're very cheap; I'd recommend buying 5 or so just in case it happens a second time after you adjust the wires. Don't try to jump it or repair the fuse btw, just get the right amp fuse or something slightly higher
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#5 (permalink) Old 11-03-2011, 01:41 PM
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I am having trouble finding the fuse. Should it not be on the relay here or have I blown it completely off?
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#6 (permalink) Old 11-03-2011, 04:10 PM
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You're missing the whole thing for some reason. The fuse AND the screws
http://www.dieselgiant.com/glowplugrepair.htm

Last edited by AMGViper; 11-03-2011 at 04:20 PM.
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#7 (permalink) Old 11-03-2011, 04:16 PM
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So it seems... I took the screws out to see if there was some sort of fuse in there but there seems not to be. I'm wondering if it was replaced at some point with an older version or if that is the OEM part.

At this point I am very confused, because I checked the glow plug wires and relay as described here (Mercedes Diesel Glow Plug Repair) and everything is checking out. There doesn't seem to be any shorts in the wires or the relay.
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#8 (permalink) Old 11-03-2011, 04:19 PM
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Another development I forgot to mention is that after having it plugged into the block heater overnight, she started right up in the morning. This time, however, the glow plug light did not come on before or after the car had started. To make matters more confusing, after letting it sit for four hours and looking at testing the glow plug relay system, she would not start.

Last edited by 190ddiesel; 11-03-2011 at 04:38 PM.
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#9 (permalink) Old 11-03-2011, 04:31 PM
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That definitely does not look like a 1987 glow plug relay

here is the correct part :
87 190D Glow Plug Control Relay

maybe somebody switched it to a later model, could be a 1995 S350D.

Last edited by NMBMBZ; 11-03-2011 at 04:35 PM.
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#10 (permalink) Old 11-03-2011, 04:41 PM
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Well, if the problem lies with the relay I will definitely look to get the actual one. The inside of the relay box looked good and I tested it with a multimeter and it checked out. Would there be another fuse that could be blowing out somewhere?
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