Is there something wrong with my injectors?

[95 gsx]

I just put a set of FIC 650's in my Talon. I hooked up the logger so I can set my baseline on the LO throttle setting and I noticed that my o2 sensor isnt functioning (it'll hop around 0.02 and 0.04 volts) and the STFT setting is stuck on +17%. Any adjustment on the AFC yields nothing. So, I put my 450's back in and everthing was fine: o2 voltage cycled normally and the STFT hovered close to 0.

This is what I know: The o2 sensor is a brand new Denso unit
The 560's I had in it before responded normally and I was able to tune them with the AFC
Fuel pressure is 43psi with the line off
I have a small leak at the TB shaft seals
The 650's did the exact same thing when I put them in the GSX
The AFC is set up correctly

Im stumped, Im about to go buy another set of 650's and give them a shot. I did some research and all I could find is that the computer may be in closed loop and thats why I see the +17% fuel trim. Any suggestions?

 

[turboglenn]

that's odd, i wonder if the injectors are not opening ( at least one of them anyway ) or if they are the wronf imp-edence and causign electrical issues in the ECU? just som thoughts, never had this happen to me though

 

[95 gsx]

that's odd, i wonder if the injectors are not opening ( at least one of them anyway ) or if they are the wronf imp-edence and causign electrical issues in the ECU? just som thoughts, never had this happen to me though

It may be a possibility; The injectors are used after all and who knows where they've been or what they've been in. They're definitely 650's, it's engraved on the injector body.

 

[Twinky-Ninja]

I agree with glenn, check the resistance of the injectors. They should be around 2-3 ohms if they're low impedance, which the stock 450's are. 8+ ohms indicate they're higher impedance injectors not meant for the stock dsm ecu.

 

[95 gsx]

I agree with glenn, check the resistance of the injectors. They should be around 2-3 ohms if they're low impedance, which the stock 450's are. 8+ ohms indicate they're higher impedance injectors not meant for the stock dsm ecu.

Just checked the resistance: 2.8 ohms

 

[95 gsx]

Update: I reset the ecu and everything seems to be working now. Thanks for the help guys.