u/spoonandpig

(Photo for engagement)

I have looked everywhere but can’t find a definitive answer on this for 1999.5-2001 trucks. Is the man harness connection pin layout different?

My 2000 F450 7.3 ZF6 needs the top/main engine harness replaced. The harness that runs across the top of the motor and plugs into the valve covers, ICP/IPR, etc.

I know the 2002 and 2003 manual trucks had some harness differences and extra coolant sensor stuff, but from what I can tell my 2000 is the earlier simpler setup (VOAA strategy, Federal emissions).

I found the Prosource Diesel 99.5 to 01 Federal “auto” harness and visually it matches mine exactly:
- same routing
- same UVCH connectors
- same connector count
- same plugs everywhere

Only difference I can find is the replacement harness has the EBPV flap actuator connector in the valley and mine does not.

Prosource says it won’t work because it’s for an automatic truck, but I’m struggling to see what would actually be different on the engine side.

Has anyone actually used one of these “auto” harnesses on an early manual truck?

My 2000 F450 is having the following symptoms:
- Cold + ICP plugged in → no start
- Cold + ICP unplugged → starts, but rough
- Warm + ICP unplugged → somewhat better
- Warm + ICP plugged in → stumble at ~1800 RPM

When the truck is cold, it has trouble or won’t start with ICP plugged in. With the ICP unplugged, it usually starts and idles without issues, but sometimes will die after a minute of idle. After warming up it runs “fine” with the ICP unplugged, plugged in there is still the RPM stumble issue mentioned above.

I have replaced the ICP sensor and pigtail with Motorcraft parts. When replacing the pigtail I did not notice any oil wicking into the harness. The computer shows that the ICP voltage is around 1V, which I believe is correct.

The next thing I was going to replace was the IPR valve but I’m starting to think I should stop throwing parts at this and see a pro.

Any help is appreciated! Thanks.

(photo included for visibility)