7.3 IDI start issues
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Junior User
Joined: Nov 2011
Posts: 80
Likes: 2
7.3 IDI start issues
My 7.3 IDI in a 91 F350 has just developed a start issue. I turn on the key. The Wait To Start light comes on then turns off when it appears to be ready to start, but the engine will not start. Fuel feed is OK as is evident by the smoke. It will start only after I spray chain saw gas lightly into the breather box. I have never used starting fluid. Since it had been 10 or more years since new glow plugs, I replaced all (Bosch). No help at all although 1 of the old plugs was blown. No start! How about the glow plug relay/controller? I had to put on a new one 7 or 8 years because of a broken wire at the base of the solid state portion.
All replies appreciated.
All replies appreciated.
Senior User
Joined: Jan 2010
Posts: 181
Likes: 0
Did you replace your Ford glowplugs that lasted 25 years with some not Ford bosch plugs. Get you some real ford glowplugs, check your relay. Replace it with a Ford relay. I sell 1 a week here to the guys that have bought one from the bluebox outfit...
i ain't rite
Joined: Mar 2005
Posts: 65,605
Likes: 5,629
From: Marlboro Mental Hospital.
i have a led or small 12 volt light hooked to the output of the glow plug relay on all my diesels so i can tell whether the glow plugs are getting power or not. i do not trust the wait to start light. way too many times the WTS light comes on but the led does not, telling me the controller is telling the WTS light the glows are working, but the led is telling me they actually are not.
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
^^^^^ Good idea; the GLOW PLUG light in the earlier trucks with the old-style, often-maligned controller works exactly this way. Much more useful IMHO, as it also tells you when it after-glows.
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