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  #1  
Old 10-22-2004, 04:47 AM
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84 300TD won't shut off, Help?

Mercedes Benz 84 300TD

Has anybody heard of this? It just started today and it shuts off but after a really long rumbling. It seems to be getting worse. Any solutions? What would it cost?

Thanks,

JAM

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  #2  
Old 10-22-2004, 11:08 AM
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Have you any problems with the central locking? auto trans shifting late? power brakes hard? If any of these, you have a vacuum problem.
Check by using the STOP lever on the injector pump. If the engine stops easily, start checking the vacuum system. If there is oil in the vacuum pipes, there may be a fault with the shutdown diaphram (Sp?), or in the worst case the vacuum pump itself.
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  #3  
Old 10-22-2004, 11:19 AM
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And after you check with the stop lever, check the vacuum shutoff by removing that line and use a miti-vac or equivalent on the unit. If that shuts off OK, check the rubber hoses for splits, etc. Could even be bad hoses connecting ignition switch.
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  #4  
Old 10-25-2004, 05:51 PM
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Off

Yes, When I lock the car all of the doors lock except front passenger, and the car does take some time to shift into drive and reverse. What do I need to do now.?

Thanks a billion.

Last edited by JAM300; 10-25-2004 at 06:02 PM. Reason: central locking problem
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  #5  
Old 10-25-2004, 06:10 PM
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Oil Change

I changed the oil the day before all of this started happening and I just checked to see if maybe I had disconnected a hose when I was changing the oil filter canister but everthing looked intact. What would the specifice hose(s) look like?
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  #6  
Old 10-25-2004, 06:31 PM
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stop lever

The car shuts off with the stop lever right away.
I pushed in and tightened all the hoses that I thought were relevant to the problem and all the doors lock and unlock now. Still doesn't shut off though.

What color is the hose or hoses that I need to worry about?

Thanks.

Last edited by JAM300; 10-25-2004 at 06:33 PM. Reason: change
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  #7  
Old 10-25-2004, 07:20 PM
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Shutoff lines.

Red Flag!!! Changed the oil... The shutoff valve is at the back fo the Injection Pump (IP) and the vacuum line that connects it can be knocked off. Check this first as you probably just knocked it loose.

Otherwise I wrote earlier...

The shutoff lines are generally brown. I think brown wiht a blue stripe to the IP shutoff valve. easy way to check this shutoff valve without a Mity Vac is to pull the hose from the rubber connector on the shutoff valve (it is located at the back of the injection pump under the white vacuum bleed valve) then start the car. With the car running connect the shutoff valve directly to the vacuum supply line going to the brake booster. You can disconnect one of the feed lines coming off this main line (like the one going to the distibutor oin top of the valve cover) and just use a short piece of tubing to connect the shutoff valve directly. If the car shuts off quickly then you need to start tracing lines to find and isolate the source of your vacuum leak. On a MBZ diesel a Mity Vac is an invaluable piece of equipment for testing the ACC system and vacuum connections to doors etc.

A huge word of caution. If you decide to DIY the shutoff valve read up on it here as some have accidentally had a bad install and had a runaway motor as a result. I have done two with no problems but I am very careful to ensure that the shutoff engages the fuel rack correctly. Even then I am still nervous when I first fire off the engine.
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Last edited by Fisherman; 10-25-2004 at 07:25 PM. Reason: Just noted the oil change thing...
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  #8  
Old 10-26-2004, 03:57 AM
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shutoff valve

You say the shutoff valve is at the back...........back of the oil filter canister?
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  #9  
Old 10-26-2004, 04:24 AM
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back of the injector pump.

the fitting points toward the oil canister

Did someone tell you that it can also be a clogged switch?

There is a thread in that somewhere, I saw it about 6 months ago.

The cure is to disconnect the vacuum line that goes to the injector pump and hook it up to an air source.

it blows all the crap and built up oil in the vacuum switch (ignition switch) out and all over the interior of the car. Or at least behind the dash. Aparently the switch can get clogged up and not send the vacuum to the shut off actuator.

If you have a door lock problem and shift problem check every hose you can. Replace all that are cracked or brittle.
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  #10  
Old 10-26-2004, 06:30 PM
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shutoff valve

I took the first step in making sure the shutoff valve was secure. There seemed to be oil all inside the rubber connector and around the end of the brown hose with a blue line. I wiped and cleaned it out really good. Still won't shut off. I'll try blowing through the hose with air source and to see if that helps, should I blow air through the brown line from the shutoff valve that leads up to the dash or through something else? If this doesn't work.......

where can you get a mity Vac and how do you use it to check all of the lines.?

Or could it be possible that oil is down in the vaccum pump? How would you fix this.....

Thanks,

JAM

Last edited by JAM300; 10-26-2004 at 06:34 PM. Reason: air
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  #11  
Old 10-26-2004, 07:27 PM
djfitzd
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If you can have someone shut the car off while you hold the vac line to the shut of solinoid, you should be able to feel the vacuum on the line by holding your finger to the opening. Also if you can put a vacuum sorce to the shut off solinoid , you can try to see if it shuts down the engine. This will tell you where to go next.
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  #12  
Old 10-27-2004, 09:50 AM
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oil in the shutoff line

Is usually indicative of a failing or failed shutoff valve. It uses vacuum to pull the fuel rack inside the IP back to the point of fuel starvation and if the diaphragm inside the shutof is bad it will pull oil all the way back into the key switch and eventually cause some leaking of oil in vrious other ares i.e. under dash or in my case on top of the radio.

I still find it hard to believe though that the shutoff valve just went bad after an oil change all of a sudden...

Mity Vacs can be had at almost any auto parts store or places like harbor Freight tools. It is just a hand held vacuum pump with a gauge attached such tath you can pump up the vacuum and then watch the gauge for leakage.

You might be able to get a local indy to test the shutoff valve for you for a few dollars if you approach them right about it. With the possibility of replacing this part they may check it for free. It is not a big job and the 1/2 hour or so of labor with them might be well worth the money if this is the bad part.

Good luck.

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