I have a 1993 F 250 7.3. Trying to get some information about the Glow Plug Module. Recently it has started getting longer and longer "shutting off" and starting to "charge." I am assuming that it is going bad, as well I am not even sure that the glow plugs are working. Been too cold in MD to check. Any advice or suggestions would be appreciated.

Another question; When I turn on the turn signals/flashers the tachometer follows the flash. I originally thought a ground was missinga dn geting feedback through the guages. I started probing around behind the tach it seemed that the solder on the PC portion of the guage may be broken. Now my tach does not track engine speed as well. Any thoughts?

Thanks in advance,
Jim

 

Welcome to FTE. I believe your controller is solid state. They cost about $270 from Ford. I replaced mine with a push button. Do a search and you will see alot of info on the controllers and gps, both pro and con. I can't help much with the tach. Can you resolder? Good luck with it.

 

Jim if the WTS is getting shorter then more GPs are not working, Autozone has Beru/Motorcraft ZD9 for $10 a great deal. Here is a blurb I like......

If you have 2 or more bad GPs, the controller may not cycle at all.

Two problems that occur with the solid state ( 1987 to 1994 IDI engines ) GP systems. If a GP burns out ( circuit resistance goes up ), the controller cycles the GPs at a faster rate which doesn't let them get to max operating temp. If 2 or more GPs fail, the controller may not cycle the GPs at all ( very rapid or no clicking heard ). When you check the GPs, use an ohmmeter. A high resistance ( not necessarily burned out ) GP can cause circuit resistance to go up and the controller will then cycle the GPs too fast. You probably will not find this problem with a test light. Resistance spec for GPs = .5 to 1 ohm cold. Second problem. A poor controller ground ( black wire attached to valve cover stud ) will cause the controller to leave the GPs on longer, often damaging or failing them. If you are having mulitple GP failures, I would check closely the controller ground. Now the confusing part. Bad ground --> longer GP on time ( slower cycling ). Burned out GPs --> faster cycling If you have both situations, it may appear that the controller is cycling the GPs at the proper rate. Bad ground slows it up while the burned GPs speed it up ---> normal cycling. The system acts/sounds like it's working normally, but you have a hard starting concern.
DieselDon

Glow plug torque is 12 ft lbs, I always use antisieze on the threads.

GP controllers only $120 at http://www.mwfi.com/ford_73.htm

OK with the tach not tracking does the auto trans work good.........????