has anyone had any computer probs when you removed the cat ? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

orlando240 · 11-27-2001, 09:35 PM

i want to put an apex n1 exhaust on my car with a test pipe will i get check engine lights? and if i do is there anyway toi kill the lights with out removing the led ?

by the way its on a 95 240sx

thanks guys

phil

(Edited by orlando240 at 9:38 pm on Nov. 27, 2001)

*transient* · 11-27-2001, 10:02 PM

You got an error because of the way the Cat works in the s14, it's integral in monitoring the Air/Fuel mixture. There are ways to get around it, but until you do it I'd put the cat back on...

*DSC* · 11-27-2001, 10:45 PM

Just wondering, how can an o2 sensor tell the computer whether it needs more fuel or more air? Will the car still run right (just have an annoying light) or will the air/fuel mixture actually get messed up and make the car stall or something?

Krunko · 11-28-2001, 12:14 PM

I heard you can weld in a straight pipe on the s14's and take the little rope tehing htat's holding it and attach it to the pipe and it will run fine.  amattmatic240sx told me that.....or something like that.

Anyone here of that before?

ca18Silvia · 11-28-2001, 07:32 PM

There are two sensors in the exhaust - usually.

The real O2 sensor sits right up by the collector. (depends on model)

There is a cat temp sensor which is in the cat itself. It is used to ensure the cat is not over temperature. I have only witnessed an overtemp condition not an under temp.

The cat temp sensor I have removed (legally in NZ). Well actually it is still in the loom but is measuring the air under the floor of the car.

The real O2 sensor is used by the ECUs for closed loop operation and feedback control of mixture.This is left in place as it is crucial to the effective tuning of these vehicles.

mistert · 11-28-2001, 08:02 PM

i know for hondas you can buy little gadgets for under $25 shipped that fool your ecu, simply using a little heater element to make the ECU quit throwing codes. im sure theres a nissan equivalent somewhere, or if they're both 4 wire sensors, it'd be cross compatible?

11-27-2001, 09:35 PM	#1
orlando240 Join Date: Jul 2001 Posts: 21 Trader Rating: (0) Feedback Score: 0 reviews	i want to put an apex n1 exhaust on my car with a test pipe will i get check engine lights? and if i do is there anyway toi kill the lights with out removing the led ? by the way its on a 95 240sx thanks guys phil (Edited by orlando240 at 9:38 pm on Nov. 27, 2001)

11-27-2001, 10:02 PM	#2
transient Premium Member Join Date: Jun 2001 Location: Los Angeles, California Age: 41 Posts: 2,947 Trader Rating: (0) Feedback Score: 0 reviews	You got an error because of the way the Cat works in the s14, it's integral in monitoring the Air/Fuel mixture. There are ways to get around it, but until you do it I'd put the cat back on...

11-27-2001, 10:45 PM	#3
DSC New Title Join Date: Aug 2001 Location: VA Posts: 3,454 Trader Rating: (0) Feedback Score: 0 reviews	Just wondering, how can an o2 sensor tell the computer whether it needs more fuel or more air? Will the car still run right (just have an annoying light) or will the air/fuel mixture actually get messed up and make the car stall or something?

11-28-2001, 12:14 PM	#4
Krunko Zilvia Junkie Join Date: Sep 2001 Location: Sherman Oaks, CA Posts: 349 Trader Rating: (0) Feedback Score: 0 reviews	I heard you can weld in a straight pipe on the s14's and take the little rope tehing htat's holding it and attach it to the pipe and it will run fine.  amattmatic240sx told me that.....or something like that. Anyone here of that before?

11-28-2001, 07:32 PM	#5
ca18Silvia Join Date: Nov 2001 Posts: 4 Trader Rating: (0) Feedback Score: 0 reviews	There are two sensors in the exhaust - usually. The real O2 sensor sits right up by the collector. (depends on model) There is a cat temp sensor which is in the cat itself. It is used to ensure the cat is not over temperature. I have only witnessed an overtemp condition not an under temp. The cat temp sensor I have removed (legally in NZ). Well actually it is still in the loom but is measuring the air under the floor of the car. The real O2 sensor is used by the ECUs for closed loop operation and feedback control of mixture.This is left in place as it is crucial to the effective tuning of these vehicles.

11-28-2001, 08:02 PM	#6
mistert Pearl White Mike Join Date: Oct 2001 Location: memphis TN Posts: 908 Trader Rating: (0) Feedback Score: 0 reviews	i know for hondas you can buy little gadgets for under $25 shipped that fool your ecu, simply using a little heater element to make the ECU quit throwing codes. im sure theres a nissan equivalent somewhere, or if they're both 4 wire sensors, it'd be cross compatible?