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#1
05-16-2013, 09:45 AM
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83 240D hard to start
Does anyone know if vacuum is req'd to start a 240d? Does the vacuum fuel shut off use the vac to switch off the fuel or to enable fuel flow? My 240 has just developed a reluctance to start first thing. Not temperature related, just hard on first start, turns over well, appears to have fuel at IP, just doesn't fire for ages. Wondering if the low vac at idle (10) is a factor....
Once it has been started once, it's easy to start for the rest of the day... 1983 240D, auto
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I choose to be happy, even when the Mercedes is being awkward, lol 
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#2
05-16-2013, 10:22 AM
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I don't think vac has any bearing on starting. I'd look at glow plug function and if fuel might be bleeding away on shut down.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#3
05-16-2013, 11:54 AM
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Quote:
The first start of the day takes about 60 secs of cranking, sometimes two cranking sessions(with a starter cool down break in between). The temps are warm enough that the glow plug light isn't coming on; I have tested them, found OK.
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I choose to be happy, even when the Mercedes is being awkward, lol
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#4
05-16-2013, 12:07 PM
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I guess you have clean primary & secondary fuel filters.
Did you check the fuel tank screen "filter" ? If this is clogged it will starve power. ...
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'87 924S '81 280SEL Sold -> 81 300SD - 93 300E w/ 3.2 85 300D- 79 300SD 82 300CD 83 300CD - CA 87 190E 5 spd 87 Porsche 924S "..I'll take a simple "C" to "G" and feel brand new about it..." 
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#5
05-16-2013, 12:15 PM
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Quote:
Power is normal, once running...
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I choose to be happy, even when the Mercedes is being awkward, lol
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#6
05-16-2013, 12:21 PM
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Like Tom said sounds like a GP issue, I would check this first.
Here is the Diesel Giant GP troubleshooting info. Mercedes Diesel Glow Plug Repair If the problem persists, pump the Primer Pump a few times and if she starts then it could be fuel bleeding off some. with a full tank of fuel, the gravity flow would keep this from happening, maybe a tank below 1/2 this could happen. Fuel filters would be the next thing to change, and the often over looked tank screen. since this is your summer car and it sits all winter, you could have some bugs growing in the tank. how does the Pre-filter look? Vacuum is to turn the fuel off and shut the engine down. However if there is vac applied to the Vacuum shut off valve, then it won`t start. The brown line at the rear of the Injection pump goes to the vac shut off valve. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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#7
05-16-2013, 12:30 PM
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Dang you guys are fast.
You can change the tank screen, but it would be best to wait until you are down to the reserve light. thin there will be only 3 - 4 gallons to drain. If the screen is say 3/4 plugged up, then you will have more fuel. the screen is about 3 inches tall. I had the surprise one time when I dropped the screen and got my Baptismal Diesel bath.  The fuel hits the Axle, Diff and goes everywhere. I used one of those cement mixing pans sold at home depot, placed under there to catch any fuel. next time I will have a tarp on the ground first, more rags and maybe some oil soak stuff. (Kitty Litter). As far as dropping the tank. it comes out from inside the trunk, so the fuel line to the Screen has to be unscrewed first anyway. you need a 46mm socket to unscrew the screen. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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#8
05-16-2013, 01:49 PM
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Your glow plug light should come on regardless of outside temperature....there is a temp sensor in the head on the car....it may be hot outside but the cylinders may be cold inside....you need glow plugs....you may also need a relay....
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#9
05-16-2013, 02:06 PM
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__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#10
05-16-2013, 02:37 PM
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85 300D turbo pristine w 157k when purchased 167,870 July 2025 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked
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#11
05-16-2013, 02:50 PM
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X3 or 4, Bad GPs are the most likely culprit in a no start situation. One bad one in a 616 will cause a problem as you describe.
__________________
 1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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#12
05-16-2013, 04:19 PM
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Quote:
Quote:
If you glow the plugs and do not attempt a start, how long does the relay remain closed? You should be able to hear it "clunk" when it opens.
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#13
05-16-2013, 04:40 PM
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#14
05-16-2013, 05:09 PM
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A hot wire from the battery and quickly touched to the top of the GP will tell the story..no spark= No good. (not for the "looper" type) Thats a quick check if your on the road or dont have your tool box. I have never set a car on fire by doing this
 or has the old mechanic that showed me this quick check.The best check is to pull them out (I pull the hard injector lines also) and use that hot wire and a ground wire and see if they quickly get red hot.
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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#15
05-16-2013, 05:20 PM
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Quote:
__________________
1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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