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xodus
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« on: May 18, 2009, 01:32:27 AM »

ok so i keep throwing the catalyst efficiency code. replaced both o2 sensors because they were bad ...  seems about every 200 miles it comes back saying the same code .. but theres no smell , no power restriction , cat doesnt get cherry red like there suppose to when there bad... It had cai , header , exhaust , high flow cat , pulleys , tsx intake maifold , the p2r spacer for nitrous , all i can think of right now... lets hear your guys input
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« Reply #1 on: May 18, 2009, 06:08:44 AM »

As long as you are sure that the cat itself is not bad then throw a spark plug non-fouler on the secondary O2 sensor.
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« Reply #2 on: May 18, 2009, 09:37:56 PM »

Im gonna go with Paul on this one since he fixed my code and if your running a high flow cat thats definately the culprit! Defoulers it is!
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timot_one
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« Reply #3 on: May 19, 2009, 12:18:04 AM »

Quote from: "NVA-AV6"
As long as you are sure that the cat itself is not bad then throw a spark plug non-fouler on the secondary O2 sensor.

+1

I'm running a spark plug non-fouler on my Magnaflow high flow cat after getting a P0420 code.
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Tim
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« Reply #4 on: May 19, 2009, 11:33:29 PM »

I've got a High flow cat on mine and I've put on approx. 150 miles on the cats since then. The reason I replaced it with a HF is because the car threw a cat inefficiency code. I forget what my OBD reader said but I knew it had something to do with the cats and something inefficiency. This was around mid winter 08'.

When I took off the OEM cats, the catalyst looked fine to me but replaced it anyway. I guess I'll wait to see if I get a code because of the high flow cat.
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xodus
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« Reply #5 on: May 21, 2009, 12:12:23 PM »

ok , just figured it kind of odd because it didnt start happening until i did a fuel system clean..
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« Reply #6 on: May 21, 2009, 06:35:45 PM »

High flow cats have been known to throw codes with our cars.  Even the so-called "OBDII compliant" converters will code.  If you buy one, you're taking that risk.  Defoulers may or may not fix the problem.  They generally work but they cannot be relied upon with 100% certainty.  The only 100% effective solution is to purchase an OEM catalyst or a Hondata Kpro.
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Steven A.K.A Skippy
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« Reply #7 on: May 28, 2009, 11:41:25 PM »

I have nearly 550 Miles since I've changed my cat to High Flow and still no CEL's. The bad part is I'm going to jinx myself now. If anybody is interested in the converter I used, its this one. http://cgi.ebay.com/ebaymotors/2-Catalytic-Converter-High-Flow-Stainless-Steel_W0QQitemZ200346105043QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item2ea58ef4d3&_trksid=p4506.c0.m245&_trkparms=65%3A2|39%3A1|240%3A1318
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Skippy
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« Reply #8 on: May 29, 2009, 11:07:39 AM »

The code everybody gets is the P0420 for catalyst innefficiency.  This is because a high flow cat has a less dense cell system or is of straight through design.  The primary A/F sensor is located on the header and is what the computer uses for fuel trim calculations.  The secondary sensor is used for emissions and is placed half way through the catalyst.  If the ECU sees little to no change in the voltage between the two sensors, it thinks there is a problem with the catalyst.  Spark plug defoulers are used to combat the problem since they block the sensor from a portion of the exhaust flow which causes less gas to hit the sensor, which leads to a lower voltage output to the ECU.  Sometimes this works, and sometimes it does not.  Every car is tempermental with this kind of modification.
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Steven A.K.A Skippy
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« Reply #9 on: January 25, 2011, 03:31:01 PM »

Reviving this old thread.  I just got a test pipe made for my car and I have the cat efficiency code even with a o2 simulator (defouler).  Does anyone, by any chance, know which of the 4 wires on the o2 sensor is the signal wire?  I'm just going to solder in a resistor to eliminate the cel on my car. 
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Mike
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« Reply #10 on: January 25, 2011, 03:38:43 PM »

Might be easier to double up the defouler
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timot_one
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« Reply #11 on: January 25, 2011, 11:20:19 PM »

Get a longer defouler like Mike said.  I wouldn't mess around with resistors Brian.
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Tim
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« Reply #12 on: January 26, 2011, 02:48:15 PM »

I'm messing around with resistors.  Cheesy  In fact, I'm putting in a diode on the sig+ wire to the o2 sensor.  I'm going to do this today and if it eliminates my problem, I'll write up a diy.  It will cost $2 at most.  But it will require soldering.  I'll keep you guys posted.
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timot_one
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« Reply #13 on: January 26, 2011, 10:02:35 PM »

What is a diode going to do?  I think this is a very bad idea man. 
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Tim
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« Reply #14 on: January 26, 2011, 11:07:07 PM »

My assumption is that your using a zener diode to attempt to produce a constant voltage level?
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