2nd O2 sensor? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

*SaintlyCharBoy* · 07-20-2002, 11:40 PM

i installed my hotshot 2 days ago, it had a fitting for a second sensor, which would, on the stock piping, follow the cat.  

they sent me the wrong adaptor for the sensor, so
1 there is a hole in my header, about 12mm around and my car is hella loud, has 0 back pressure, poor flow, and backfires a lot

2 even though the sensor is not "sensing" any of my exhaust due to my inability to install it, the car is running fine...

any theories?
wha tis the sensor there for any ways?

i'm kind of figuring that is it just taking an O2 readig from the ambient air, so it's working, but not doing it's true intended job... and thus far i've been lucky

thanks for any insight
Sean

rubbersidedown · 07-21-2002, 06:37 PM

my guess is that maybe its for an exhaust gas temperature sensor.

Racer X · 07-22-2002, 08:50 AM

i going to assume that you have an obd2 car (95+) the second o2 is there only to tell you computer if your cat is working right. if you had a v8 four sensors <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/crazy.gif" border="0" valign="absmiddle" alt=':crazy:'> gotta love our tree hugging government leaving it out will soon cause a check engine light but other than that will not affect performance at all.

bbp · 07-22-2002, 01:39 PM

I would not drvie the car too much missing that plug.  My Hotshot header had 2 ports, one for the egr (plugged) and the other for an O2 sensor.  They should sent you a plug for the second sensor, running the car with a hole in the exhaust that close to the head could burn a valve.

Otherwise you should be fine except for the check engine light.  It will only trip the light if you are at anything except wide open throttle.  So, if you don't like the light, drive around with the throttle mashed to the florr  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt='

'>

07-20-2002, 11:40 PM	#1
SaintlyCharBoy Premium Member Join Date: Jan 2002 Location: Bow, NH Age: 43 Posts: 849 Trader Rating: (1) Feedback Score: 1 reviews	i installed my hotshot 2 days ago, it had a fitting for a second sensor, which would, on the stock piping, follow the cat.   they sent me the wrong adaptor for the sensor, so 1 there is a hole in my header, about 12mm around and my car is hella loud, has 0 back pressure, poor flow, and backfires a lot 2 even though the sensor is not "sensing" any of my exhaust due to my inability to install it, the car is running fine... any theories? wha tis the sensor there for any ways? i'm kind of figuring that is it just taking an O2 readig from the ambient air, so it's working, but not doing it's true intended job... and thus far i've been lucky thanks for any insight Sean __________________ 92 vert - KADE + VH41 + GM MA5 = too many parts in the garage 95 base - retired

07-21-2002, 06:37 PM	#2
rubbersidedown Zilvia Junkie Join Date: Aug 2001 Posts: 343 Trader Rating: (0) Feedback Score: 0 reviews	my guess is that maybe its for an exhaust gas temperature sensor. __________________ 1991 240sx coupe w/ ca18det Bone stock Purchased but not installed parts: HKS adjustable timing gears Electronic Oil Pressure Guage Apex'i Multichecker t3/t04b turbo Stainless Steel, top mount tubular manifold ARC bov 450cc injectors Spearco FMIC

07-22-2002, 08:50 AM	#3
Racer X Zilvia Junkie Join Date: Apr 2002 Location: brooklyn park Age: 42 Posts: 334 Trader Rating: (2) Feedback Score: 2 reviews	i going to assume that you have an obd2 car (95+) the second o2 is there only to tell you computer if your cat is working right. if you had a v8 four sensors <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/crazy.gif" border="0" valign="absmiddle" alt=':crazy:'> gotta love our tree hugging government leaving it out will soon cause a check engine light but other than that will not affect performance at all. __________________ Twin67 ls1/awd in the works

07-22-2002, 01:39 PM	#4
bbp Zilvia Junkie Join Date: Apr 2002 Location: oHIo Age: 53 Posts: 477 Trader Rating: (0) Feedback Score: 0 reviews	I would not drvie the car too much missing that plug.  My Hotshot header had 2 ports, one for the egr (plugged) and the other for an O2 sensor.  They should sent you a plug for the second sensor, running the car with a hole in the exhaust that close to the head could burn a valve. Otherwise you should be fine except for the check engine light.  It will only trip the light if you are at anything except wide open throttle.  So, if you don't like the light, drive around with the throttle mashed to the florr  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=''> __________________

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