Glow Plug Issue
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Glow Plug Issue
I have a 1984 Ford F350 with a 6.9L Diesel. I recently had the glow plugs, glow plug controller and sensor replaced. Now the glow plug light will only come on win the engine is cold. If the engine is warm, around 190-200 degrees, it fires up just fine. If it is colder than 190 degrees, the glow plug light does not come on and the truck is difficult to start. I was told that the sensor is working properly and that the problem is that the engine doesn't have enough compression. The truck has 100,000 miles on it.
Any help on what to do next would be greatly appreciated.
Any help on what to do next would be greatly appreciated.
Senior User
Joined: May 2008
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Who told you it had low compression? is that an opinion, or was a compression test performed? if not i would run a compression test and check your manual to see what it should be. is this the same problem that you had before your glow plugs and sensor were replaced? might try a second opinion.
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From: Virginia
When it's difficult to start, do you see white smoke out of the exhaust while it's cranking?
You also could give up on the controller and just put a manual switch on the glow plugs like a farm tractor. Do a search in the pre-powerstroke forum on +manual +glowplugs and you will find the instructions on how to do it.
You also could give up on the controller and just put a manual switch on the glow plugs like a farm tractor. Do a search in the pre-powerstroke forum on +manual +glowplugs and you will find the instructions on how to do it.
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My truck blew a hose while I was driving and shut down completely. The mechanic told me that it needed many new parts including the replacement of the glow plug system. Before the hose blew and the truck was fixed the glow plug system worked fine.
When I start it with a warm engine there is a lot of white smoke pouring out the exhaust pipe before it turns over.
The mechanic did a compression check and said it was low but to be expected for the age of the truck. I asked about the manual switch for the glow plugs and he thought that was a bad idea because he thought the glow plugs would be easily damaged from holding the switch down too long.
When I start it with a warm engine there is a lot of white smoke pouring out the exhaust pipe before it turns over.
The mechanic did a compression check and said it was low but to be expected for the age of the truck. I asked about the manual switch for the glow plugs and he thought that was a bad idea because he thought the glow plugs would be easily damaged from holding the switch down too long.
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Joined: Jan 2001
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From: Virginia
If you get good glowplugs, they will hold up fine. All the white smoke means you are getting fuel, so it sounds like the glowplug system is the problem. The problem is, your mechanic apparently does not want to fix it. Go up to the pre-powerstroke forum, copy and paste both of your posts here in a new thread. If the right people come along, they know more about it than I do.
Hotshot
Joined: Feb 2004
Posts: 11,697
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From: Marengo, Iowa
100,000 is barely breaking in these motors. Unless it has a hard part failure, it should not be that low on compression. My 6.9 likes glow plugs at 70 degrees, won't start without them. It runs just fine after that though. I would say the glow plugs are not working quite right, or already went out. Like mentioned, check out the prepowerstroke forum, you will find most of your questions have been asked and answered.
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