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#1
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Need repair advice for my 87 300D
I purchased a nice 87 300D (150K) last year. I have driven it about 8k miles. Coming back from a trip in November I would have to turn the key serveral times for the glow plug lamp to iluminate before starting. This means one or more of the glow plugs needs replacement. Latter the engine started hammering really bad and it is hard to start and spews grey smoke. Now when I start the car the idiot lites do not illuminate. I think the injectors need rebuilding/replacement. I don't want to blindly replace parts. I have the factory manual.
What is the best way to go about diaganosing the problem in order to not waste a lot of money on needless repairs? Mercedes source sells diagnostic guides. Are these any good? Can I do the work my self? Can anyone recomend a good diesel mechanicl in the Los Angeles (Redondo Beach) area? |
#2
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It sounds like you need to check a number of things!
I'll start with a few simple things. If you haven't replaced both fuel filters in six months or so, do so! Add some boibore to your fuel (stops algae growth) Change air filter too! Make sure all six GP's glow. Ohms for each GP should be 03.0 to 08.0 but not 00.0. Just curious, but does this engine still have the trap oxidizer? Try this and report back. BB |
#3
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For the idiot lights not coming on check the fuses. Make sure none of the spots where the fuses make contact are corroding or look bad. Also, instead of repeatedly turning the key till the light comes on, just turn it to the right for 5 seconds or so, turn off, then turn back on and voila the light should come on. Or, even though the light doesn't come on with a bad GP, the rest of the plugs are still working so just wait awhile when the key is in the on position to start.
Thanks David
__________________
_____________________________________________ 2000 Honda Accord V6 137k miles 1972 300SEL 4.5 98k miles _____________________________________________ |
#4
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Yes, you can leave the key on until the GP relay/timer clicks, about 30 seconds, listen and you can hear it click from under the hood!
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#5
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Congratulations on the purchase, and welcome to MercedesShop!
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Best Regards, Jim |
#6
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A few questions
Thanks for all the quick replys.
1. When I change the the large fuel filter on the 87 300D do I have to purge out the air? If so how do you do this? 2. I want to fill the large filter with a diesel fuel purge/additive. Are there particular brands you recomend. It is ok to us what pepboys carrys? Are there certain products to stay away from that could cause damage? 3. How do I remove the glow plugs to check their resistance? I have the factory manual but it is sometimes hard to navigate. 4. How long do glow plugs and injectors last. If one goes as a preventive measure should I replace the rest? |
#7
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Injectors can be rebuilt, there is a debate on quality of parts. If they aren't obviously bad, I'd say leave them alone for the time being... Best Regards, Jim |
#8
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More Glow Plug and Injector Questions
I measured an infinit resistance from the connector glow plug 3 to ground. This indicates either a bad cable or bad glow plug.
Question1: In order to replace the glow plug on an 87 300D does the intake manifold have to be removed? If I go to all the trouble to do this than I plan to replace all the glow plugs. Question 2: Many posts here state to hold on to the injectors. Where can I find a reputable injector rebuilding source? |
#9
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Best Regards, Jim |
#10
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Injector rebuilds
Go to the Robert Bosch Gmbh website to look for a service station near you.
The problem we are seeing with New and Rebuilds is/are substandard injector "Pintles". Hang on to your O.E. injectors and the servicestation can rebuild them for you,using your original "Pintles". IF you actually need rebuilding! Try the injection "Purge" first.(Lubro-Moly) Do a search for the above,instructions included! |
#11
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Could I have a tank of bad fuel?
I changed both fuel filters. I filled the large fuel filter with diesel injector cleaner. The car started fairly quickly. No smoke and very quiet. After a while it started hammering. After 3 min. the hamering sound level leveled off (very loud), but no smoke. My last tank of diesel I bought in Arizona at the Califorina border. Could it be that I have a bad tank of diesel fuel. I have about 3-4 gallons in the tank. Should I drain the tank? How do I do this? Or do I have another problem like bad injector(s)?
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#12
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How do I turn crankshaft for ATF change
How do I turn the crankshaft in order to access the ATF drain plug of the transmission torgue converter. I am changing the ATF fluid and filter.
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#13
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how can I post a new thread
I can't find the creat new post or thread button on my screen.
Where is it? |
#14
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The button is on the left side, just below the title block. |
#15
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also double check the glow plug fuse
Folks,
I had an intermittent problem starting my 87 a while back. No glow plug light or on for just a moment. The fuse for the glow plugs ( 80amp?) in the glow plug relay had a hairline crack. Cold it would conduct, warm it would separate, then no glowing. $1 later and a new fuse - it was fixed. Hope it is simple and cheap for you. Chuck |
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