I'm new to this site. I have a early 99 f250 7.3 superduty that one of the injectors broke but truck still ran fine. I purchased a used injector and installed it but now the truck won't crank now. Did get it to crank for a few seconds. Checked the batteries and replaced the glow plug relay. Truck ran before changing the injector so I'm not sure what happened. Any help would be appreciated

 

First off, Welcome to FTE. CHeck to see that all wires are hooked up and that the HPOP reservoir is full of oil.

 

I just recently changed the oil. I did double check all my connections.

 

Did you do the oil change befor or after the injector?

 

Before the injector change

 

Check your HPOP reservoir to see if it is within 1" from the top. It on top of the motor over the HPOP.

 

When you say "won't crank" do you mean when you turn the key the starter does not turn? or the engine turns but does not fire?

Smokie

 

The motor turns over like always, just won't fire. It fired and idled fine before swapping the injector out. So I'm not sure what happened

 

How long have you been trying to crank it since the injector change?

 

I killed the batteries twice cranking it and they are new batteries. So a good bit

 

check the #30-30amp fuse..to rule that out

 

I already checked the fuse and I have a WTS light

 

I just changed all 8 of my injectors the last 2 nights. It took me several minutes of cranking, draining the batteries, charging them back up and draining them again. I would say all totaled, 3-5 minutes of actual cranking time of 6-8 cycles of 30 seconds or so cranking, before it finally compressed the air enough to build up ICP in order to fire. Keep craning, once you introduce air into the system, it can take awhile. Do you any way to monitor ICP?

 

I have no way to monitor the icp. With all the cranking I done it should be running. Several cycles of the fuel pump, etc.

 

I thought that as well. Believe me, I have had my injectors out in singles, batches of a few at a time, and now all 8, sometimes it takes a very long time to get it to fire off. I was at the point last night where I was going to let go of the ignition in about half a second and it finally caught. I used to pull the ICP sensor and top of the drivers side oil rail, and then pull the HPOP line off the passenger side and top it off. That will cut the cranking time down a little bit.