lb7 misfire codes are killing me please help

[haney789]

My lb7 is pouring with smoke and I've got a misfire at 4 and 8 cyclinder I've done my balance rate tests and they are all at 7 besides 4 and 8, they are both 15. Cylinder 5 reads like a normal injector. I have switched the injectors around and bought a new one and they still stay the same. Could this be electrical?

 

[andy-stevenson]

Doubt it.

Sounds like it's time to replace all the injectors.

 

[haney789]

I have 1 new injector and the rates didn't change and these injectors have like 5000 miles on them

 

[andy-stevenson]

Where'd you get the injectors from? Reman? Refurbished?

 

[haney789]

Reman from merchant automotive

 

[haney789]

I have a brand new one I put in today and it didn't change the rates

 

[motoking_1990]

tuner? efi live?

 

[haney789]

I had ppe but took it off during repairs

 

[TheBac]

What codes are being set?

Have you double checked all wiring connections to injectors?

Sounds like a problem with the FICM.

 

[haney789]

Its a p0300 p0304 p0308. One of the harnesses is new