Removing O2 sensor J extension bung on FI LTH

reynald3616 · 02-09-2017, 10:43 PM

so i went to a tuner because my car have this code p0300 for a while now and recently the car is running really bad and misfiring a lot. This p0300 code started when we installed the FI LTH and so i went to the tuner because this is what they recommend to me and now the tuner still cant fix the issue and told me i need to get rid/remove the extension bung or J bung that comes with the headers and have the o2 sensor bolted directly to the pipe. Is this going to be a fix to my car or not?

lj909 · 02-10-2017, 12:14 AM

Isn't there 2 bung locations?

Sensor 1, direct exhaust flow. (This is what the ECU uses for adjustments)
Sensor 2, extension bung to defeat CEL.

If your tuner doesn't know this, get a different tuner.

Spooler · 02-10-2017, 06:28 AM

Get another tuner. Seems they are not very good. I see you are in California. I would Sebastian at Specialty Z to tune it.

JARblue · 02-10-2017, 07:11 AM

I've only ever heard positive things about Seb at Specialty Z

reynald3616 · 02-10-2017, 08:04 AM

the thing is i already paid him $650 i will go back there today and have him look at it again and if he cant still fix it hopefully he can still give me back my money.

JARblue · 02-10-2017, 08:05 AM

You're risking damage to your precious Z every time you let that tuner touch it. Request a refund (good luck) or just cut your losses and move on would be my recommendation.

Chuck33079 · 02-10-2017, 08:08 AM

Quote:

Originally Posted by JARblue

cut your losses and move on

This.

reynald3616 · 02-10-2017, 06:33 PM

Ok so it turns out to be a bad front O2 sensor and now i need a new one. I dont know which one to buy the upstream or downstream o2 sensor? And what brand is a good one with a good price and where to buy them? Thanks in advance

jchammond · 02-10-2017, 07:32 PM

Quote:

Originally Posted by reynald3616

Ok so it turns out to be a bad front O2 sensor and now i need a new one. I dont know which one to buy the upstream or downstream o2 sensor? And what brand is a good one with a good price and where to buy them? Thanks in advance

Up=stream is the front...usually the rear one's tuned with.
They can be damaged if you used impact wrenches to remove bolts,etc..when removing/installing lth's

jchammond · 02-10-2017, 07:33 PM

Also,i thought a po300 was random cylinder mis-fire?

jchammond · 02-10-2017, 07:35 PM

Bosch is pretty durable...but other people make them/a bit pricey for the up-stream(front) one's.....usually the rear's are turned off during a tune-to prevent a cel

jchammond · 02-10-2017, 07:40 PM

Upstream is in the header & not the J pipe bung

Sent from my iPhone using Tapatalk

reynald3616 · 02-10-2017, 07:54 PM

What do you think about the brand NTK or Denso?

jchammond · 02-10-2017, 08:01 PM

Quote:

Originally Posted by reynald3616

What do you think about the brand NTK or Denso?

either should be fine...Denso may be oem/ like spark plugs,
NTK is NGK's brand...haven't had to replace any yet @ 77,500mi.
just don't us impact wrenches on exhaust & be sure exterior of sensor's are clean...around wiring.

reynald3616 · 02-10-2017, 08:05 PM

Which sensor is bank 2?

02-09-2017, 10:43 PM	#1 (permalink)
reynald3616 Base Member Join Date: Jan 2014 Location: san diego Posts: 103 Drives: 09 370z nismo Rep Power: 12	Removing O2 sensor J extension bung on FI LTH so i went to a tuner because my car have this code p0300 for a while now and recently the car is running really bad and misfiring a lot. This p0300 code started when we installed the FI LTH and so i went to the tuner because this is what they recommend to me and now the tuner still cant fix the issue and told me i need to get rid/remove the extension bung or J bung that comes with the headers and have the o2 sensor bolted directly to the pipe. Is this going to be a fix to my car or not?

02-10-2017, 12:14 AM	#2 (permalink)
lj909 Track Member Join Date: May 2014 Location: Riverside Posts: 584 Drives: 40th 370Z Rep Power: 13	Isn't there 2 bung locations? Sensor 1, direct exhaust flow. (This is what the ECU uses for adjustments) Sensor 2, extension bung to defeat CEL. If your tuner doesn't know this, get a different tuner. __________________ PW 07 HR350Z R.I.P. Totaled by 82yr old woman 2010 40th Anniversary 370Z

02-10-2017, 07:11 AM	#4 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 44 Posts: 36,450 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684441	I've only ever heard positive things about Seb at Specialty Z __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

02-10-2017, 08:05 AM	#6 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 44 Posts: 36,450 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684441	You're risking damage to your precious Z every time you let that tuner touch it. Request a refund (good luck) or just cut your losses and move on would be my recommendation. Chuck33079 likes this. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

02-10-2017, 07:33 PM	#10 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 58 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684395	Also,i thought a po300 was random cylinder mis-fire? __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

02-10-2017, 06:28 AM	#3 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 14,109 Drives: 2013 Nismo 370z Rep Power: 2684394	Get another tuner. Seems they are not very good. I see you are in California. I would Sebastian at Specialty Z to tune it.

02-10-2017, 08:04 AM	#5 (permalink)
reynald3616 Base Member Join Date: Jan 2014 Location: san diego Posts: 103 Drives: 09 370z nismo Rep Power: 12	the thing is i already paid him $650 i will go back there today and have him look at it again and if he cant still fix it hopefully he can still give me back my money.

02-10-2017, 06:33 PM	#8 (permalink)
reynald3616 Base Member Join Date: Jan 2014 Location: san diego Posts: 103 Drives: 09 370z nismo Rep Power: 12	Ok so it turns out to be a bad front O2 sensor and now i need a new one. I dont know which one to buy the upstream or downstream o2 sensor? And what brand is a good one with a good price and where to buy them? Thanks in advance

02-10-2017, 07:35 PM	#11 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 58 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684395	Bosch is pretty durable...but other people make them/a bit pricey for the up-stream(front) one's.....usually the rear's are turned off during a tune-to prevent a cel __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

02-10-2017, 07:40 PM	#12 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 58 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684395	Upstream is in the header & not the J pipe bung Sent from my iPhone using Tapatalk __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

02-10-2017, 07:54 PM	#13 (permalink)
reynald3616 Base Member Join Date: Jan 2014 Location: san diego Posts: 103 Drives: 09 370z nismo Rep Power: 12	What do you think about the brand NTK or Denso?

02-10-2017, 08:05 PM	#15 (permalink)
reynald3616 Base Member Join Date: Jan 2014 Location: san diego Posts: 103 Drives: 09 370z nismo Rep Power: 12	Which sensor is bank 2?

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