Question about 1986 Ford F 350

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1986 GMC 6.2L Diesel Glow Plugs will not cycle

We are trying to fix our 86 GMC 6.2 L Diesel. The glow plugs are good but we can not get them to cycle. Have tried pulling it to get it started but still no luck. Any ideas what to try?

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  • cfischer145 Apr 15, 2009

    we have tried jumping across, we replaced the solenoid, checked the glow plugs, and still no luck.

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There is a glow plug relay mounted to the rear of the engine try jumping across it to run the glow plugs and see if it will start then (these relays fail quite often)

Posted on Apr 14, 2009

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Try a battery with more cranking amps cannot hurt. If it is a diesel have an engine heater put on, there are also glow plugs which preheat the combustion chamber on a diesel try to cycle the glow plugs twice before cranking. a battery warmer is also a good idea and thinner oil for the cold season.

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1986 ford f350 won't start


The solenoid click sounds very strong, implying that you have a charged battery and the ignition circuit is functioning out to the solenoid. Suspect an issue with the starter motor. Is the starter motor installed and connected properly?

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I would try changing your fuel filter. Inspect the fuel lines for leaks. Air getting in the line would cause fuel to flow back into the tank.
I really suspect that the long cranking time may be a problem not with the fuel system but with the glow plugs, You probably need to replace the plugs as they are not pre-heating the combustion chamber properly to allow ignition of the diesel fuel. To start a diesel motor with out glow plugs you have to crank the motor until enough heat is generated to ignite the fuel. Glow plugs are not very expensive and fairly easy to change your self.

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I have an 1993 Ford F250 turbo diesel truck that won't start. I've been told, that the glow plugs are not warming up. Where are the glow plugs and is there anything I can do to warm them up or fix? Do they...


Are you waiting after turning ignition key on before actually moving key to start position? My diesel I turn key to 1st position;bells and lights;if engine is cold an amber light that looks like a lamp filiment comes on...wait until that light goes out before engaging the starter.

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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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Hello philkatkiele: My name is Roger and I will help you. First thing you need to check is the glow plugs. They will need tested individually. Un plug all 8 glow plugs. Take a test light and hook end to the positive battery cable. Touch opposite end of test light to the terminal end of the glow plug. The test light should light. Touch all 8 glow plugs. Ant that do not light are bad and will need replaced. If glow plugs are burnt out then the controller will flash wait light to early or very fast. The wait light should be on for approximately 10 seconds.If al glow plugs check ok then I would suspect the glow plug controller as the problem. Also if the temperature out side is below 40 degrees the truck should be plugged in. This will help to make the engine start easier. Should you need further help please just ask.Please rate the answer as this way I know it was helpful. Thank You for using Fix Ya. Roger

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I have a 84 f-350 6.9 diesel. Glow plug problem. I can cycle on and off several times and eventually it will come on. getting harder each time. Fix???


most of the time in this situation glow plugs are bad or the controller is bad one or the 2 but i would change glow plugs first try this and see what happens

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Sounds like bad advice. If your glow plugs are bad, the last thing you want to do is try to start it. Remember, diesel engines use these glow plugs like coils in a toaster. Since diesel is harder to burn than gasoline, the glow plugs heat up to a combustible temperature, allowing the diesel to ignite and your vehicle to start. I don't know the reprocussions of trying to start it without them working...but it can't be good.

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there is a injector driver module relocation kit with a heat sink to mount it to because the module in the orgional location the module would overheat. also check the glow plugs the quick easy way to do this without removing them is to unplug all the glow plugs then hook a jumper wire up to battery positive and and touch it to each glow plug there should be a spark and if there isn't then the glow plug is bad.

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They make two relays that will fit but only one will work. Call 772 283-8999 ask for John, He will tell you more than you really want to know, the dude is about the best diesel mechanic I know. You can email him at disinc@fdn.com. Tell him Peppi told you to contact him. If John is not available ask for Ron, he is better at GMC products ( no one is perfect ) but he can help you as well. They are real good guys and will take the time to help and can get parts for anything. Hope this helps

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