Is Your Holley Efi 02 Sensor Bad? Take a Look Inside my "Tune The Trilogy" Course 

If your on the fence about Joe's course, it's definitely worth it.

I had a “Bosch” o2 sensor kick my a$$ with my sniper. It was going for 10-20 so fast at weird times. I checked everything but the o2 sensor because it was new. I installed a new o2 sensor and found. The one that was acting up was actually fake bosch sensor. I was so mad and happy at the same time because I fixed it. Thank you for your videos

Thanks Joe my tuner turned me onto this video. This is very similar to what my truck is doing .

here for broken spark plug pics

Just for reference. When my Terminator X o2 went bad it would add 5% fuel every WOT pull. Didnt realize until my eyes were starting to burn lol

Woah live comparison data, that's slick!

DUDE NICE BEANIE

Joe's videos are the best!

Great video, weird to have a O2 fail like that too.

Good work joe

I'm pretty sure this is exactly what is going on with mine right now.. showing 20:1 at idle and 12.5:1 with some throttle and I can literally see black smoke coming out the hood stack from it being so rich.. I have the 02 in a sampling chamber and was thinking that was the issue, but not I'm thinking it is just a bad sensor..

I'm not on the fence about Joe's course I do need to finish this engine and get it on a dyno with a carburetor to make sure everything is correct. I've heard some pretty bad stories of people trying to do a first start with EFI. That won't be for awhile unfortunately. BTW this problem would have been very hard to find without a Dyno.

You mentioned that the HP or Dominator O2 sensors are more expensive... aren't they all Bosch LSU4.9 unless you specifically get an NTK one?

My Holley Dominator eats those Bosch wideband sensors for breakfast for some reason. I’m on my forth sensor in about a year. I’m going to try the NTK sensor then if that fails I’m thinking I might have a bad driver with the Dominator.

The truth every time keep it up 👍

Hey Joe I have a BBC WITH HP HOLLEY it started running really rich one day and to the point it wouldn’t Start the O2 was pegged at 35 it’s a holley Bosch I’ve bought a new NGK 554-100 new plugs an a new set of copper collector gaskets as the headman header collectors O2 is really close to the sensor I haven’t put the new parts in yet!! Two questions Could it run so bad it ruins the plugs ? Stopping it for trying to fire ? Can I use copper RTV on the copper gaskets to guarantee no leaks TIA

I love your channel. Been following since i fired this money pit up. Anyway Ive been having wild afr readings from th TermX’s o2, which is backed up by a stand alone PLX meter(albeit a lil latent with data transfer even w sample turned all the way up) reporting to my digidash. Still im assuming its a bad sensor. Since i cant find anything definitive please, PRETTY PLEASE! Can you tell me will a holley 554-100(ntk sensor) work with. TermX? ANY help wood be fabulous! Most sincerely @meye wits end in Mi

I had my original Holley sensor, go out and heard you could just replace it with the Bosch is Holley‘s specially calibrated that the Bosch won’t work?

What does it mean when the o2 readings jump around while

When my Bosch O2 sensor died on my Sniper EFI it didn't go full lean but it locked itself at 15.5 AFR 90% of the time but still ran perfectly fine and revving it up didnt even change the reading. Replaced the sensor and the issue went away. A failed sensor does not always go full lean

Just came across your video. I am having an issue with a new install that I just drove the first time. My afr seems to be reading correctly and then all of a sudden after only a mile or so, the afr readings just stop completly and dont move at all. Stops at different readings every time, maybe 12.50 one time and 14.20 the next. The afr fluctuates like it should, and then just stops fluctuating, and doesnt change any more, no matter what the throttle input is. On the next startup, the afr reads 28.0+ and struggles to start. Once started, the afr comes back down near the commanded reading and then the issue will reappear again. This sounding like an O2 sensor issue or something else? Any info is appreciated. Thanks

Was this a TermX car or HP/Dominator? You said you swapped from a Bosch to an NTK sensor. I know the TermX harness has the right plug for the NTK, but I thought the ECU just couldn't run the NTK sensor.

What you’re saying makes perfect sense however I like to take a different approach with my own car. I give closed loop and learn a bunch of authority, my logic is, when something goes wrong, it goes a long way off making it very obvious something is wrong straight away, if it’s only allowed to go 20% it might not be noticeable straight away and be 20% lean under full power and melt everything.

I have a Terminator X system and I'm using the narrowband bungs on my longtube headers as the location for my Wideband. I feel like I've got a heater control strategy issue. Are these safe to run at 9 or 3 o'clock? Or do they need to be pointing down just a touch?

Can you go over the different NTK sensors? Have heard about Lab grade vs other ones. How many NTK ones are there? Have been wondering if one from rockauto would work with EFI systems. A lot cheaper than getting them from Holley or Fueltech, etc.

Great info thanks

Just had this same issue on a customer car. It would happen after blipping the throttle a few times. IAC would catch the engine and return to idle. You could set your watch to it after that about 3-4 Mississippi and the AFR gauge would sweep clear pegged to 18 and it would stumble and almost die and peg the IAC. It would either catch it and recover, or die. This would only occur after a few blips “small revs” of the engine. Would do it ever single time like clock work. Took out the knockoff Amazon sensor and put a Bosch in it. Problem solved. It does a similar thing now, but only will go to 14.5-15 and recover rather than peg it to 18:1 and die…

Yo give me a call sir !!!!

I understand closed loop can save your bacon but it can also screw you over big time haha

My car has been acting funny. I had it tuned and all did well, now when accelerating at wot it's cuts out dies and backfires kinda a loss for words even after new plugs and everything