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#1
05-04-2006, 10:37 AM
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Looking for help.............
this is my first MB experience, bought the 80 300CD with new glow plugs, has a cold start issue, needs starting fluid even in the now warm weather. I like to do my own work, even major rebuilds and have experience with diesels (off road). Most likely an electrical problem here, should check +and- (wiring), relay(s), is there a most frequent issue here to look for. Appreciate any help I can get here, thanks in advance.
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80 300CD new to me 
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#3
05-04-2006, 10:40 AM
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How warm is warm weather? Sounds more like a compression issue to me. Buy a cheap multimeter, search this forum for glow plug testing. If the weather is warm enough, it should eventually start with enough cranking, without glow plugs. Could be a valve issue, maybe.
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1989 300E 144K
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#4
05-04-2006, 10:41 AM
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By the way, welcome to the board and your new obsession (don't believe me? Give it a few months.)
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1989 300E 144K
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#5
05-04-2006, 11:14 AM
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Yes, the most frequent issue to look for is a cracked strip fuse in the glow plug relay. Follow the wires to the black box on the driver's side of the engine bay. The fuse is inside and looks like a piece of metal held down with 2 philips head screws. It can be cracked and look fine, so remove it completely to check. Be careful, because one of those terminals is hot all the time.
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Rick Miley 2014 Tesla Model S 2018 Tesla Model 3 2017 Nissan LEAF Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro Chain Elongation References
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#6
05-04-2006, 11:16 AM
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Welcome to the forum.
Following up with Rick's recommendation............. He's thinking the glow plugs are not functioning whatsoever. I agree with this. Find a voltmeter and look for 12V at one of the glow plugs immediately upon turning the key to the #2 position. If you do not have 12V, then, it's very likely that the fuse cracked, or the relay is not functioning properly. BTW.......do not use starting fluid on these engines. You run a serious risk of damage.........they are not like your garden variety Cummins. Last edited by Brian Carlton; 05-04-2006 at 11:30 AM.
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