1976 300D Wont start - Page 4 - Mercedes-Benz Forum

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post #31 of 40 (permalink) Old 05-11-2010, 09:20 PM
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Start blocking off other vacuum circuits, such as vacuum locks, AC. One of them must be leaking vacuum. If all those systems hold vacuum check the vacuum shutoff valve on the IP see if it holds vacuum, then you can check the vacuum switch on the ignition itself.

'79 280CE with 226,000 miles
'76 240D 4 speed with 190,000
'85 300D Turbo with 266,000 miles


GONE but not forgotten
'76 300D with 195,300 miles
"83 300D with 174,000 miles

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post #32 of 40 (permalink) Old 05-11-2010, 09:34 PM Thread Starter
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Start blocking off other vacuum circuits, such as vacuum locks, AC. One of them must be leaking vacuum. If all those systems hold vacuum check the vacuum shutoff valve on the IP see if it holds vacuum, then you can check the vacuum switch on the ignition itself.
there are a couple of tubes coming through the fire wall that have pipes missing and are just hanging there in mid air, can you post me any links so i can see how they are set up in lay mans terms( where they should terminate etc.) ?
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post #33 of 40 (permalink) Old 05-11-2010, 09:36 PM
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I dont know of any sites that show diagrams for W115's. But if you post pictures of your set up im sure i can help you get it set up right.

'79 280CE with 226,000 miles
'76 240D 4 speed with 190,000
'85 300D Turbo with 266,000 miles


GONE but not forgotten
'76 300D with 195,300 miles
"83 300D with 174,000 miles

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post #34 of 40 (permalink) Old 05-11-2010, 10:20 PM Thread Starter
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cool
will do tomorrow
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post #35 of 40 (permalink) Old 05-13-2010, 10:18 AM Thread Starter
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I dont know of any sites that show diagrams for W115's. But if you post pictures of your set up im sure i can help you get it set up right.
i think i can manage to figure out the wiring method from the diagrams on that pdf for relay testing link you sent thanks
i should get it.
That car is great fun but still quite smokey. My associate assures me it is a carbon build up burning off from the car sitting idle for 6 months. i thought it was a worn piston ring seal but the compression is good and she fires right up in the morning now first turn of the key ..but still a little smokey..
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post #36 of 40 (permalink) Old 05-13-2010, 08:48 PM Thread Starter
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someone was running the damn car on kerosene heating oil and that was causing it to smoke more than usual plus low power output!!
fixed a leak and boosted the a.c. today , man these cars are wonderfull
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post #37 of 40 (permalink) Old 05-14-2010, 07:19 AM
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50 cool Congrats!!

You sound like me............I love doing car revivals!!! Did it on an old XJ6 a few years back that was sitting for 7 years...with forums like this I got it "singing like a song"!
I am relatively new here and am "looking" to buy a 78 280ce............the guys on this site are AMAZING. How many miles on that old bird of yours?
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post #38 of 40 (permalink) Old 05-14-2010, 08:01 AM Thread Starter
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Smile

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You sound like me............I love doing car revivals!!! Did it on an old XJ6 a few years back that was sitting for 7 years...with forums like this I got it "singing like a song"!
I am relatively new here and am "looking" to buy a 78 280ce............the guys on this site are AMAZING. How many miles on that old bird of yours?
yes this forum is great. your picking a cool car .i love the look of them 280's though i never actually driven one. I do this the 70's era was mercedes finest hour- better than the 123's sorry guys i just cant get enough of the layout of them. I got two 123's but they just dont do it for me like that 70's one.

i went through all the service history the other night, it starts from day1 and tapers off at 2001. the odo stopped working at 73000 i worked out it has about close to 300,000 on it. Shes still only a baby and just stretching her legs and clearing her throat.. I actually bought the car from a guy who worked in mercedes garage and they couldn't get it going lol
anyone would think i am crazy to buy a non running mercedes from those guys that work on them all day long...

anyway back to the questions. i was driving the 300D yesterday and looking at the temp guag. it looks like it runs a little hot (although it doesn't over heat) the needle seems to point to around the marker on the gauge between 175 and maximum temp. I suppose if it had a marker number for this needle position it would read 200? is this a normal operating temp or is it high??

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post #39 of 40 (permalink) Old 05-20-2010, 11:19 AM Thread Starter
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Start blocking off other vacuum circuits, such as vacuum locks, AC. One of them must be leaking vacuum. If all those systems hold vacuum check the vacuum shutoff valve on the IP see if it holds vacuum, then you can check the vacuum switch on the ignition itself.
i got the car to shut off ok now. the pot had come loose under the dash.
Trying to get the door locks to self lock now. Do you know where all the yellow lines branch off from to each door? I notice there are only 2 lines going to each door. so they must all branch from a central location i presume.
My main check valve is good. I think my drivers door valve is bad it looks damaged. and even from the drivers door on each line they wont hold vacukum with the mighty vac. The actuator in the passengers door works well with the mighty vac and the doors look not to be tampered with so i think the problems are elsewhere. i notice i dont have a big yellow check valve under the hoodas seen in the pics...


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post #40 of 40 (permalink) Old 10-21-2010, 08:03 AM
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Did you get issue fixed?
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