Ok so I had a misfire code for number 4 cyl. I have some spare good injectors. Swapped out number 4 no change. Changed it out again with another injector no change. Checked voltage at pigtail reads same as number 6. Truck has heavy white smoke at idle and raised rpm. If you unplug #4 when it’s running little to no change in motor sound. Checked fuel rate and injector rate with tech 2. All the injectors and the calculated fuel rate (mm3) is all over the board. Calculated fuel rate is from a 2 to 19,20. Pulled oil fill cap Incase it was a cracked piston no excessive crank pressure. I’m lost harness looks good. Truck is a 06 lbz with 367000. Any help would be great.
Lbz injector problems
- Thread starter cencal_dmax
- Start date
Sounds like to me the injector is not electronically energizing what was the voltage you got on pin number 2?
Pin number 1) is injector control
Pin number 2) is injector positive voltage
Looking at the harness from the backside number one will be on the right
It should be a 40 V system From what I’m reading here the voltage feed should modulate back-and-forth , I would put a T pin on number 2 get voltmeter set to DC start the vehicle and watch your voltmeter see if it’s modulated back-and-forth if you have a lab scope that would be even better
Pin 1)
On the control side voltage should remain low
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Pin number 1) is injector control
Pin number 2) is injector positive voltage
Looking at the harness from the backside number one will be on the right
It should be a 40 V system From what I’m reading here the voltage feed should modulate back-and-forth , I would put a T pin on number 2 get voltmeter set to DC start the vehicle and watch your voltmeter see if it’s modulated back-and-forth if you have a lab scope that would be even better
Pin 1)
On the control side voltage should remain low
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Last edited:
Of course confirm you have good compression And then test the injector electrical system be careful as there is a small amperage flowing through there
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Thank you thebac. Thank you everyone for the help. Did a compression test and 20psi at
6 cranks. Going to tear the motor apart hopefully it’s something in the head. Thank you again everyone.
6 cranks. Going to tear the motor apart hopefully it’s something in the head. Thank you again everyone.