Question about 1990 Mercedes-Benz 300 Diesel

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1986 mercedez diesel 190 d 2.5 hard start

Car will not start in mornings only with starter fluid , could it be the cold start injector ? and i tried to locate on engine but could not find any help would be appreciated thank you .

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Glow plugs are probably bad

Posted on Feb 01, 2009

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1 Answer

Wont start in the morning when the engine cold


You don't state make or model, if carby fuel system check accelerator pump and choke are working, if fuel injection check cold start injector is working. If diesel motor check glow plugs.

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Are you certain that you put diesel fuel in the car? Had to ask that question. How long did the car sit before you refueled? If it sat for a while and if the temperatures and humidity were enough to produce a build up of water vapor, that might keep the injectors from sending "dry" fuel to the cylinders.

Just running out of fuel won't harm the glow plugs (hence poor starting) and won't require need for a new battery unless the current battery was failing even before draining the tank.

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Check your battery for proper volts (12.6). Sometimes the cold weather will bring a battery down. Also check the Starter Relay, again cold weather will make it stick causing it not to start. Those are the biggest problems with a car not starting in the cold weather unless you have something else going on then your starter and your ignition needs to be checked.

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I would try replacing the fuel filter it could be clogged and then when you prime it with starter fluid it gives it enough pull to allow fuel to flow. when engine is cold fuel can gel so when the vehicle is warm it allows fuel to flow easy allowing it to start. that is just one of many things it could be but if you haven't changed filter in a while it cant hurt to change it and who knows that might be the problem if not you have a nice clean fuel filter anyway. If you have the diesel it pays to keep the fuel filter clean because diesel fuel will gel quicker than gasoline .

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I just bought a 1986 F250 with a 6.9 Diesel in it. In the morning or when it is cold in general it has trouble starting. I am pretty sure this is a glow plug issue. I intend to replace the glow plugs, glow...


Hi,
I would recommend disconnecting your glow plug relay if you are going to use starting fluid.
With starting fluid in the engine and the glow plugs turn on it may explode the fluid and do head damage. Starting fluid and any kind of ignition source ( hot glow plug ) is like a bomb.
Wayne

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