Question about 1989 Ford F 250

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Glow plugs aren't working...what do you suggest?

I have an '89 F-250 diesel and the glow plugs aren't working. What do you suggest? Thanks, Bo

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Probably the glow plug relay or module,usually towards the rear of the engine,black box that ticks when you turn the key on for about 12 seconds

Posted on May 20, 2009

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I have a 1994 f 350 turbo diesel IDI when I try to


Don't just keep cranking if it don't start right away' Give the starter a break. It's getting hot because you just keep cranking on it. Any vehicle diesel has glow plugs to heat the fuel chamber to make it start fast. Be sure you are making use of the glow plugs and it will start fast. If your glow plugs are not working, find out why. Could be just the glow plug relay or connection to it. Or possibly the glow plugs are burned out. Either way, you HAVE to have glow plugs in use on a diesel upon initial start up till it's warmed up. Then will start without them. Most are automated system. You just have to wait till the glow plug light goes out to start cranking on it. I hope this helps you to more understand the workings of a diesel cold start system.

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if the ignition controls the amount of time glow plugs are on for flick the ignition off and on 3-5 times each time letting the glow plug symbol glow untill it turns off then try starting. if its still slow to fire your glow plugs are not working at all. start by backtracing the glow plugs from the adjoining bar back to wherever it comes from for breaks, then replace your glow plug relay in the fuse box usually.

if its manual glowing just glow it for 10-12 seconds and try.if its not firing then the glows arent getting the power they need

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Have an 03 Dodge 3500 diesel that will not start when the temperature is cold. Will start fine if plugged in overnite. Unable to drive to work when cold due to this problem. Have replaced relay sensor,...


I suggest you check that the glow plugs are working as a cold diesel needs the glow plugs to initially ignite the fuel spray in the combustion chambers

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Check and make sure your glow plug controller is putting out voltage to your glow plugs, make sure voltage to your glow plugs is cycling. if it is not, at the front of the engine there is a temperature switch, if this switch is not working your glow plug controller will not work. also make sure you are getting diesel to your injector pump, if you are not, there is a high pressure switch at the back of the engine right behind the glow plug controller, if this switch is not working, your injector pump will not get fuel. also make sure both batteries are fulley charged, if one is low, your diesel will never start. you can jump out these switches, if your truck starts after bypassing, just make sure to replace them. i have a 1993 silverado C3500HD 2WD. good luck!

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I have a 2004 excursion diesel drove it all day stoped at a clients turned it off for 20 min came out and wont start the starter is going but its just not firing could it be a fuse I dont smell fuel but I...


Ok well the glow plugs on a diesel have nothing to do with the engine firing. All the glow plugs do is heat up the combusion chamber on cold starts. Diesel engines fire using high compression. An oxygen sensor won't cause the vehicle to not start and your diesel doesn't have one of those anyways. It could be a fuel related issue. (pump, line, pressure etc.) Have you it scanned for engine DTC's? But based on your knowledge of your diesel vehicle i'm going to suggest you take it to a shop.

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The Cummins does not have glow plugs as mentioned above. It has intake heaters. I have a 99 also and it is a cold natured girl on a cold morning. You should have a block heater to plug in when it is below 40 F. The electric plug should be on the passenger side just inside grill on the hood. You can plug it in all night or a couple of hours before you are ready to go and it should help. Also, since your wait to start light is not working, the intake heaters may not be working. Check them out.

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You can get the error codes from the ecu. Many auto parts stores will loan a meter to do it.
Also test the glow plugs using the vehicles system. Do them individually.

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Only thing is Diesels dont use spark ignition. Most reasons for failure of diesels to start is in the glow plug system. Usually just replacement of all glow plugs is sufficient but could be deeper. If you know what your doing you can give a small spritz of starting fluid in the air cleaner and it will start and stay running usually proving a glow plug problem. But please be warned a small spritz. Too much ether can damage a diesel engine. Hope I helped. Thanks

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