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#1
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93 300d glow plug issue
Lately my glow plugs haven't been working right. The light doesn't come on when I turn the key on but after the car cranks up the light comes on and stays on for a little while. It doesn't seem like the glow plugs are coming on during initial starting because it starts slow if he doesn't try to start it all on cold mornings. Any ideas what might be causing that issue
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93 300d-turbo 85 300d(svo)320k 83 300d 440k 84 300d(roommates)260k 83 300td(svo)250k 87 isuzu pup(diesel)svo 320k 96 nissan 240sx(turbo) 08 suzuki m50 95 e350 prowerstroke boxtruck |
#2
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Your relay self-test feature is telling you that one or more glow plugs have failed.
You can do a quick check with a meter at the glow plug relay. Black box on the forward edge of the left front wheel well. Be careful under the cover, the big screw head and strip fuse have direct battery voltage on them so watch out you don't short that out. There is a 4-pin (control) and 6-pin (to glow plug) harness. Unplug the 6-pin plug and check resistance of each glow plug to the car body. Meter pin 1 to frame, pin 2 to frame, etc. You have a 5 cylinder engine so pin 6 is empty. If you have one or more plugs where the resistance is > 1 ohm then there's your problem. Glow plug change on an OM602 is not too difficult. I would go ahead and change all 5 while you are in there. The intake manifold has to come off unless you are a contortionist. So be sure to also order the intake manifold gasket, and cross over pipe gaskets as well (o-ring on one end, flat gasket on the other).
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
#3
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Thanks for the fast response! I'll get to checking!
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93 300d-turbo 85 300d(svo)320k 83 300d 440k 84 300d(roommates)260k 83 300td(svo)250k 87 isuzu pup(diesel)svo 320k 96 nissan 240sx(turbo) 08 suzuki m50 95 e350 prowerstroke boxtruck |
#4
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>1 and <50.
Not only can they short, they can also open.
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1985 300D 198K sold 1982 300D 202K 1989 300E 125K 1992 940T "If you dont have time to do it safely, you dont have time to do it" "The democracy will cease to exist when you take away from those who are willing to work and give to those who would not." |
#5
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I believe the behaviour of your light indicates at least 1 GP that is shorted and no power is going to the GPs. You should also try to find a GP that has 0 ohms which would be the short. Also check for .7 or greater ohms but anything above 2 ohms should also be considered no good. If its the first time you will be doing this allow some time and also clean out the intake since it will all be off anyways.
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