Question about 1994 Ford F250 Supercab

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1994 7.3 wont start without ether runs good after it starts turns over good after it warms up .still wont start without ether

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There are two areas to check for this problem. The fuel and the spark. There is a Timer for your Glowplugs and you should hear clicking and notice the lights dimming in Synch with the clicking. This should work with your "Start" lamp in the dash.

Test one or two Glowplug wires with a Testlight and see what kind of Spark you have. If the spark is present you need to pull about half of your Glowplugs, if not all, and Test them with Battery voltage. They should be uniform in glowing and be careful not to melt them. Any Glowplug that remains cold or sluggish should be replaced. If no Spark, then check the Timer or replace it. Some models may have a Relay, check with Autozone or Oreillys or similar for parts listing.

The Glowplugs start a cold engine. In a warm engine, the Timer will not engage at a certain temperature. Engine compression will ignite the Ether if the Glowplugs do not work, but compression will not ignite a cold diesel engine.

Fuel, if you have a bleeddown in the fuel system the pump may be weak or there is a hole in the line or bad "O" rings. The Ether simply gets the engine turning fast enough to siphon the fuel and draw it back to the pump. A shop can pressure check the fuel system for leaks or use a "smoker machine" for difficult to find leaks.

I hope this helps and you are happy with the info I provided.

Posted on Aug 24, 2010

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  • iceman28390 Mar 25, 2011

    after 1300 dollars and still no fix. Starts only with either hot, cold, rain, or shine. Stall when coming to a stop like it runs outta fuel and gotta get the either out

  • fordexpert Mar 25, 2011

    Hello, When you had your truck in the shop, the mechanic should have pressure tested the fuel system. You also have a Vacuum pump on the pulley system and the Vacuum reservoir can sometimes rust out on the bottom of the cannister. If you use the vacuum line going to the Reservoir and create vacuum with a pump or lungs, you will be able to detect a leak in that part. It seems like you are losing the draft in the induction system, and if you have a Vacuum servo on the Cruise control, the leaks will kick the truck out of Cruise.
    If no problems detected there, then check the Electric wires to the Injector pump. Unfortunately you can't pick a spot for the truck to stall, but it would be beneficial to you to know if the Diesel fuel filter was full or empty. Then you would know if you really are running out of fuel. Fordexpert

  • fordexpert Apr 09, 2012

    Only have a few more ideas, like checking the base idle speed, ignition switch and/or ignition relay, fuel line integrity. The diesel engine has an ability to run by compression and the glowplugs only help the initial start. Again, finding out if the fuel filter is dry when it stalls would be a big help.

    You may be able to get a chassis wiring diagram through by registering with their site for free. Not sure if diesel power is shown, so be careful in trusting info. Maybe your run circuit for the ignition is partial bad resulting in the loss of your fuel supply. Since the diesel will run without spark perhaps the other important things in the electric circuits are cutting out? The kill side of your ignition circuit is clearly working or you could not shut off the engine.

    Have fuel tanks been cleaned? For fuel line integrity, most Radiator shops can test for air leaks in the fueltank or on the truck. Last thought would be any crankshaft sensors or oil pressure sensors tied to a safety shutdown to protect the engine. Since oil pressure drops when decellerating and oil pressure must build at startups, a safety sensor could kill the engine run circuit or fuel supply.


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Why does it start on ether but will not run without it?

Because it is not getting any fuel! as soon as the ether burns up if no fuel then it quits. check all fuses and relay for fuel pump. to check fuel pump to see if its running. have someone turn the key to start, while somebody is under car at fuel tank. hold hand on tank, if it works you will feel the vibration from pump. most relays for fuel pump are in under hood fuse box. a fuel pump if good, will only run a few seconds to build up pressure in line. when engine starts it runs continuously. so you may have to turn key on a few times. Good-Day!

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