So when I start my truck, all cylinders are even and idle fine. When I give it gas in let's say about second gear m, I get #7 and #5 failing. Then once the truck warms up I get full power and then cylinder 3 starts failing (once hot) to the point where the truck just disables the injector. Once cold again 7 and 5 act up and 3 is fine, once hot again 7 and 5 are fine and 3 shuts down. ????

Just bad injectors? I replaced #3 with a used one so if it's bad I wouldn't be shocked but why is it fine when cold? Could the bolt torque have something to do with #3?

 

 

Thanks!

I'm using an Autel ds808. Does a lot! I'm verifying this with power balance, which shows contribution of all cylinders on a graph. It shows me each cylinder that's firing or failing. I don't know if the blue spring has been done but I have verified fuel pressure twice and it never drops below 50-55...w/wot ...at idle it is around 58-59 psi. Ficm plugs have also been pressed in and then zip tied with heavy duty zipties for each plug. Ficm also produces 48.5-49 volts all the time.

 

Heat does funny things. Before the next cold start, do a buzz test. Do you hear all 8 click loudly & clearly? I bet you won't.
I would never gamble with unknown used injectors. Rebuilt Motorcraft for about 200 and done. Plus they carry a 2 yr warranty.

 

Yeah I agree I'm just out of work at the moment so I can't dump money into this thing. And you're correct on a cold start I only get about 4 loud buzz and 4 quite ones. Once it's warmed up they all buzz but 1 I'm assuming #3 since it fails when hot.

 

During the BUZZ test, it clicks them off in NUMBER ORDER. So you will hear all buzz first. Then you'll hear cyl #1 CLICK, then cyl #2 CLICK, ect.... When you hear a pause then that's the faulty one.

 

Ohh ok awesome, I'll do that tomorrow morning and check back. Yeah I'd always check the buzz test but never knew %100 what order they went in

 

Yup, number order. So on a healthy engine you will hear the clicks go from drivers to passenger sides back and forth. Also remember driver side starting at the front is 2, 4, 6, 8 & passenger side are 1, 3, 5, 7.

 

Also keep in mind that no-name cheap injectors can end up costing more than the $200ish if they fail badly.

 

Do you guys know what the best cost website for motorcraft?

 

My pick is Ed over at >>> FICMRepair.com - FORD Powerstroke 6.0 FICM Repair, PHP Tuning and Truck Parts
They are Ford injectors. They also have some other options with a named injector and they are less than
the Ford remans.

 

Maybe because I'm on my phone but I wasn't able to find any injectors on his site but yeah I've read good things about him on forums.

 

Just call them in the AM and talk to Ed or Scott. They can fill you in on all the options.

 

Ed's price for a late year 6.0L injector is $243

FORD OEM 6.0L V8 Injectors for 2004-2007 models after 09/22/03

AutoNation White Bear Lake sells them for $181.50

https://parts.autonationfordwhitebea...4C3Z-9E527-BRM

If the issues are all 4 on the passenger side, then I would think that the harness may not be plugged in completely, or is chaffing (as Sean mentioned earlier).

 

Alright, so I'm finding this weird...
During buzz test. Truck sat over night got down to 35 degrees.
The pattern I noticed is 1234 are loud and 5678 faint. Once test was completed it said none failed.

1-loud click
2-loud click
3-loud click (problem injector) contribution code (failure once warmed up)
4-loud click (brand new)
5-faint click (non existent) failure when cold
6-faint click (non existent)
7-faint click (non existent) failure when cold
8 faint click (non existent) intermittent cold fail