wts lamp
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Mountain Pass
Joined: Nov 2005
Posts: 206
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From: Baltimore,Md.
wts lamp
I have a 94 e-350 w/7.3. The wait to start lamp only stays on for about 2-3 seconds. I checked all the glow plugs & they are all right. I also checked the glow plug module & replaced it. The light still only stays on for 2-3 sec. The truck is hard to start. I have to jump truck & even then it takes very long to get started.
Elder User
Joined: Oct 2005
Posts: 597
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From: West Palm Beach, Florida
temperature sender may be bad
On my old truck I had to replace the temp sender that tells the glow plugs that the engine is not warmed up. There are two temp senders. One for the temp gauge and one that signals the glow plugs to turn on or not to turn on. One's bigger than the other. One's on the head and one's in the cooling jacket by the water pump. You can see them both in front, more toward the driver's side of the engine. I can't remember which is which but someone will tell us.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
Those temp sensors have nothing to do with the glow plugs.
The one in the head is the temp idiot light.
The one in the block is the temp gauge.
The temp sensor for the old style glow plug system (83 - 86) was in the back of the passenger side head.
The 94 has a solid state controller that does not use coolant temp to decied if the glow plugs need to be turned on.
How did you check the glow plugs?
What kind are they?
Check the glow plug harness for continuity to each glow plug from the controller.
The one in the head is the temp idiot light.
The one in the block is the temp gauge.
The temp sensor for the old style glow plug system (83 - 86) was in the back of the passenger side head.
The 94 has a solid state controller that does not use coolant temp to decied if the glow plugs need to be turned on.
How did you check the glow plugs?
What kind are they?
Check the glow plug harness for continuity to each glow plug from the controller.
Thread Starter
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Mountain Pass
Joined: Nov 2005
Posts: 206
Likes: 0
From: Baltimore,Md.
I put all new glow plugs in. They are motorcraft plugs. I also changed the controller. The wts lamp still only stays on for 2-3 sec.The wire harness was tested using an ohmmeter. The harness all tests good w/ very little resistance.
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Post Fiend
Joined: Nov 2004
Posts: 5,638
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From: Manitoba
Were talking a 94 right, it has the Solid state GP controller. Where did you connect the ground wire and is it tight. Dave S has a nice pic of the controllerand where the wires go.....
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Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
There is a connector that was white in color where the engine harness plugs into the chassis harness. This connector is located near the oil dip stick and has about 10 wires total in it. Unplug the connector and check for corrosion on the two big yellow wires in the connector. Also inspect for signs of melting around the big wires. They are the battery power to the glow plug relay wires, a bad connection there would change the voltage to the relay which would affect the glow plug timing cycle.
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Mountain Pass
Joined: Nov 2005
Posts: 206
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From: Baltimore,Md.
Dave you were right. There is no sending unit on the 94. The problem was someone put cheap glow plugs in the engine. Swapped w/ Ford plugs & everything is fine. They had put champion plugs in.
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