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  #1  
Old 02-08-2021, 11:51 PM
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Om606 difficult to start in cold

It has one bad glow plug in it (broke in the head). If it sits overnight and for maybe about 8 hours in 35 degrees or less, it is damn near impossible to start without needing to throw a jump box on it. Is the one bad glow plug enough to throw it off this bad? I ordered a block heater cord for it. This is the first year in PA Iíve ever had an issue starting it and Iíve been running it off 5 plugs for about 3 years. 227k miles, running Lubromolly synthetic oil 10w40 (mb spec sheet approved).

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Old 02-08-2021, 11:52 PM
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BTW, all the fuel lines have been replaced and updated. No air or leaks anywhere.
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Old 02-09-2021, 05:43 AM
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What's the state of your injectors?
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Old 02-09-2021, 07:45 AM
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I had a dead broken plug on mine that I could not remove and it would still start ok at those temps even on 50/50 veg and diesel mix, you probably have another couple of dead plugs or possibly internal breaks in the glow relay outputs.

Video shows broken outputs and how to fix
https://youtu.be/D8YIfvHnHnw
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Old 02-09-2021, 08:08 AM
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Quote:
Originally Posted by jake12tech View Post
It has one bad glow plug in it (broke in the head). If it sits overnight and for maybe about 8 hours in 35 degrees or less, it is damn near impossible to start without needing to throw a jump box on it. Is the one bad glow plug enough to throw it off this bad? I ordered a block heater cord for it. This is the first year in PA Iíve ever had an issue starting it and Iíve been running it off 5 plugs for about 3 years. 227k miles, running Lubromolly synthetic oil 10w40 (mb spec sheet approved).

Is it possible that another glow plug has failed?? My 96E300d had one bad plug, and it started in 15 degree temps in Jersey on a regular basis. It took a little bit longer than usual, but it did start. My car had 130,000 on it at the time, and the battery was about 2 years old.
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Old 02-09-2021, 08:40 AM
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In addition to checking for additional failed plugs as others have mentioned, you might check for voltage at the glow plugs. It's possible the glow plug relay is packing up or has a connection that isn't being made when it gets cold.

You're *CERTAIN* there's no air in the fuel? Tank vent isn't blocked and pulling a vacuum on the fuel system?

Lastly, I'll kick that dead horse - but how's your compression?
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Old 02-09-2021, 09:55 AM
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Should start fine with only one bad plug....did that through a New England winter (maybe two?) on my 98.
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Old 02-10-2021, 01:24 PM
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I will throw out there again that I have the complete Baum tool set, complete with a Time-sert kit for repairing the head threads, for drilling out stuck OM606 glow plugs, pm me to set up borrowing it.

OM606 glow plug change - one broke off
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The OM 642/722.9 powered family
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)
2008 ML320 CDI (Older sonís DD)
2008 E320 Bluetec (Younger son's DD)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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gone but living on
1983 240D (body to greazzer, engine to t walgamuth)
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Old 02-10-2021, 09:52 PM
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Thanks folks for the response. I got 227k on original injectors no smoke yet. Good compression, afaik. The engine has been HIGHLY maintained. Synthetic oil changes every 3k and fuel filters every 6k miles.

Jay Bob, I will be in touch with you this spring. Iíd like to wait til we get out of this 20 degree weather in pa. I really miss having my lift at Mercedes with a heated shop. But career paths changed.
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Old 02-11-2021, 04:00 AM
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Quote:
Originally Posted by jake12tech View Post
Thanks folks for the response. I got 227k on original injectors no smoke yet...
You should at least check them for spray pattern because if they don't atomize properly then that will affect cold starting
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Old 02-11-2021, 06:35 AM
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Sounds good. You would be surprised how much better it will run with refreshed injectors.

I would plan on pulling the injectors and sending them off to Greazzer and have him rebuild them while you're doing the glow plug work.
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The OM 642/722.9 powered family
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)
2008 ML320 CDI (Older sonís DD)
2008 E320 Bluetec (Younger son's DD)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
----------
gone but living on
1983 240D (body to greazzer, engine to t walgamuth)
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  #12  
Old 02-13-2021, 06:34 PM
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Jay Bob, I absolutely agree. That is the plan.

Weíll update, as much as I really felt otherwise. Thereís air in the lines somewhere!!! It died last night at 1am and wouldnít reprime this afternoon. I am going to install an inline electric lift pump til the weather clears up. That should bypass the issue of no prime correct? My plan is turn it on before the car runs and keep it on while running so it doesnít die.
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  #13  
Old 02-15-2021, 03:23 AM
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Is the shut off valve o ring new too? Those needed replacing regularly (every year or two) on the one I had, it's an easy job though.
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  #14  
Old 02-16-2021, 09:28 PM
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Blockheater 3-4 hours before starting

I use the block heater with a lamp timer and extension cord for my E300. I let the heater run for 3-4 hours before starting in the morning. And, instant interior heat in the cabin!

I also go through glow cycle twice, and then the third time start the engine.

Make sure your battery is in good shape. I have a trickle charger on it over the weekend.
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  #15  
Old 02-22-2021, 01:09 AM
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You might want to look at a thread on rebuilding the Fuel Supply/Lift Pump and see the symptoms that caused the rebuild.

Personally I think injector nozzles are good for about 125-150 thousand miles before they are worn out. They certainly should be at least checked by that mileage.

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