I have a 98 F700 box truck with several issues. The other day I was running at 55 and the engine shut down with no warning.

Problems found: exhaust manifold leak burnt through the heatshield and cause a plug wire to burn up and short out. Replaced shield, wire and coil (will tackle manifold crack later), but still getting no spark (at coil).

Is it possible that when the short occurred that I fried the ICM or ECM?

 

Have you checked the oil level, some 460's had a low oil pressure shut down system.

 

I know you said you have NO spark (High voltage) at coil are you getting voltage on the hot side of the coil? and the pulsed voltage on the negative side of the coil?
If neither then you might have burnt the TFI ignition module.

 

F700 will be a 370 or 429 as OEM. No 460s in those trucks unless someone transplanted it.

 

According to the vin, they tell me 460, but regardless.. I replaced the coil, so I assum that I am not getting voltage to the coil. Where to check next I don't know. Fluid levels ok, battery power is good, fuel is full and pump is working.

The wiring is not easy to identify and I cannot locate the ICM. I'm told it is on the fenderwell but cannot find any control box that resembles it. My only thought would be that it doesn't have one or it is integrated with the computer under passenger side dash???

 

I had a 1989 F-700 die while driving and it quit didn't have spark. It was the actual ignition switch on the back of the steering column. I don't know if it is the same setup as on the 98 but it might be something to look into.

 

Who is "they"? Look it does not matter to me, but to get the right parts (some/ most of the time) you need to know 370 or 429. 460s were NOT put in these as OEM. "They" are probably looking at the list for an F350, not a 700.

Post your VIN and warranty plate info for a full decode if you like.

Look for the control module on the distributor....long shot, some were there. Of course, tracing wires from the distributor to where ever they go should lead to the module.

Check voltages at the battery, which is good, and go downstream until you find the break or loss of voltage. (serving suggestion)

 

Im getting 2.3v at the plug to the coil. when i try to crank, it drops to 2.1. No pulsing.

As for the vin... 1FDNF70J0WVA00609

 

I have replaced the TFI Module. On a positive note, I am now getting a little over 9v to the coil plug. Still no engine start.