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#1
02-28-2008, 03:16 PM
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1999 300D - glow plg and chk engine light on
New to me....1999 300D turbodiesel....I've had about 6 mos., 175Kmiles on the odo.
Today, after starting, the glow plug light came back on after the engine was started, ....then the check engine light also came on. I'm a decent DIY mechanic, worked a fair amount of VW Vanagons and Subaru engines, but this car and diesels, in general, are all new to me. Not sure where to start. Need help w/ making diagnosis and deciding if this is a fix I can manage or will I have to take it to a shop. Suggestions and tips please. Warren C. 
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#2
02-28-2008, 03:40 PM
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Probably a bad GP; maybe the relay. You should get the code read. PO380, or P1366,1367 or 1368 are possibilities.
To test yourself, go to dieselgiant.com and then to his tutorial for Checking the W123 GP system and follow the instructions therein. The write up is not for your engine but everything is still in the same locations and the prinicipals remain applicable. Search "606 broken (and/or siezed) GP's" here before attempting to change one.
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.)
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#3
02-28-2008, 03:45 PM
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ditto to what Terry said, and, when you find you have a bad glow plug be sure you do a thorough search regarding the pitfalls of removing plugs in these engines before you attempt the removal. Long story short, they have a tendancy to get stuck, and when forced, break off in the head. That is bad so you should do everything you can to prevent that from happening.
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Marty D. 2013 C300 4Matic 1984 BMW 733i 2013 Lincoln MKz 
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#4
02-28-2008, 04:17 PM
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I have the same thing right now. Once I start the engine, the GP light & CEL come back on. Car still starts fine, but runs a bit rough for the first minute, with blue smoke.
I just unclipped the harness for the glow plugs, and ran a test light between + and each GP connector. #6 was the only one that didn't light up: dead. I'm pulling the IM tomorrow after work. Shoudl be fun! I order a GP reamer for Diesel911 the first week he started selling them. Mine were all changed by the PO 2 years ago, so I'm hoping they're less likely to be seized.
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Jake 1999 e300d PlantDrive WVO/SVO conversion **note to self: oil changed at 268k kms** 1990 Toyota 4Runner FrankenDiesel swap
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#5
02-28-2008, 04:44 PM
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Quote:
Also can you send me a link to the reamer source. diesel911 Also need a link to the Lightman article on R&Ring glow plugs. This car was purchased from a dealer, ...no maintenance records, so no idea how long it's been since GPs were replaced. WC.
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#6
02-28-2008, 04:57 PM
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IM=Intake Manifold.
Check the DIY tab above and look under the 606 section for the GP article. This is the reamer Found under buy parts and then special tools tab above. Reamer must be for the correct engine. http://www.peachparts.com/diy/mb_tools/mb_tools.php?page=4 An appropriately sized drill bit has been used by some in a pinch.
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.) Last edited by TMAllison; 02-28-2008 at 05:07 PM.
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