Does this look like a faulty O2 sensor to you guys? Damn reading is all over the place. Wiring is free of any sources of EMI/RFI. Even disconnected the alternator belt just as a sanity test. When the temp comes up to 160 and closed loop learning starts I can't keep it running unless my foot is in it.
Edit: forum resizes the image so it's hard to read. Yellow is AFR and green is RPM.
Yeah, it burns the eyes. This is through closed exhaust.
Just trying to get it back up and running. Had to send to unit out for repair due to a failed injector driver. Holley stated they also replaced the ECU. Tune was blanked and it wouldn't load any of the saved tunes off of the SD card. Might be because the firmware is newer than tune saves, dunno. Ran the initial setup again and figured I would let it self learn again.
I would be calling to ask about why it won't load saved tunes.
is it same o2 sensor as before, or new one with the repaired kit?
I don't know about that setup, mine periodically asks for recalibration. if it was the old one with fuel dumping into the system, it might be over saturated and you need to pull it out into fresh air and let it heat up and have it recheck 0.
Take a look at some other sensors to see if you can find what the root cause is. Is the MAP signal fluctuating and calling for lots of fuel? Look at the fuel flow sensor to see if it is fluctuating like that also.
Start the engine up and have someone look down the throttle bores to see if one injector is stuck open or something else is weird like that.
Yeah looks like the sensor has gone bad on you. In fresh air it should just be full lean. I think there is a pass car sensor you can get rather than buying the Holley sensor but I don't recall the application. The info is probably on the Sniper forum. I think it was a VW application but I'm not sure.
Yeah looks like the sensor has gone bad on you. In fresh air it should just be full lean. I think there is a pass car sensor you can get rather than buying the Holley sensor but I don't recall the application. The info is probably on the Sniper forum. I think it was a VW application but I'm not sure.
I found an o2 sensor at the chain store what looked exactly the same with the same plug. It was $60 cheaper, but the guys on the Holley forum were adamant that the Holley branded one had to be used. Something about it being calibrated by Holley. In the end I just ordered a new one from Summit. The AFR stopped jumping around after plugging it in and when I smothered it in a brake clean soaked rag the reading went gradually down without spiking. Finally took the car out last night and got gas. Everything seems to be good now. Thanks again.
If you want to experiment with the passenger car O2 sensor you could. Plug it in and see how the car runs. Take some careful data logs with each O2 sensor and see if there is any difference. I kind of doubt that Holley plays around with the calibration since they would most likely want to use off the shelf stuff but I'm not positive one way or the other.
If you want to experiment with the passenger car O2 sensor you could. Plug it in and see how the car runs. Take some careful data logs with each O2 sensor and see if there is any difference. I kind of doubt that Holley plays around with the calibration since they would most likely want to use off the shelf stuff but I'm not positive one way or the other.
If you want to experiment with the passenger car O2 sensor you could. Plug it in and see how the car runs. Take some careful data logs with each O2 sensor and see if there is any difference. I kind of doubt that Holley plays around with the calibration since they would most likely want to use off the shelf stuff but I'm not positive one way or the other.
I would agree. I doubt they can change the calibration of a sensor but they may have one made specifically for them by the same MFR. that may look the same. One would have to have a source inside holley or their supplier to confirm. Or the ability to test both while recording any differences.
The Holley Sniper uses the cheaper parts store VW sensor, the HP & other efi use a calibrated by Holley sensor
The Sniper uses the newer 4.9 sensor whereas the HP, Dominator, Terminator use the older 4.2 sensor - maybe the newer sensor simply does not need a Holley calibration to work as expected? I assume the Terminator X would use the same sensor as the Sniper since it also uses the 4.9 sensor.
If that is an significantly improved design wide band Oxygen Sensor does anyone sell an add on meter to connect to it so that it can be used “stand alone” extra gauge below the dash board gauges and not as a part of an EFI kit?
The Holley Sniper uses the cheaper parts store VW sensor, the HP & other efi use a calibrated by Holley sensor
The Sniper uses the newer 4.9 sensor whereas the HP, Dominator, Terminator use the older 4.2 sensor - maybe the newer sensor simply does not need a Holley calibration to work as expected? I assume the Terminator X would use the same sensor as the Sniper since it also uses the 4.9 sensor.
The 1st sniper used the 4.2, I guess they updated, the HP does not use a 4.2, it is a Holley specific plug & calibrated, I use the Holley NTK sensor on my HP efi
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5