Covering the air filter slightly with a plastic bag to pass emission test - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

marryson · 10-04-2012, 11:39 PM

I just came up with this crazy idea..... my car keeps failing NOx which is caused by running to lean. (too much air, too little fuel). If i cover the airfilter slightly with a plastic bag, restricting the amount of air going into the engine. thus making the car run richer. and hopefully reduce the NOx reading. What do u guys think? will it work? what are the dangers?

jesse_s13 · 10-04-2012, 11:43 PM

marryson · 10-04-2012, 11:45 PM

Quote:

Originally Posted by jesse_s13

Just told my friend about this shit. same reaction lol

is correct..... but in theory I dont see why it wouldnt work

Croustibat · 10-05-2012, 06:18 AM

because your ECU measures air that enters and computes how much fuel it needs to send based on its mapping ... you are not running an alpha-N management system that computes how much fuel it has to send depending on the throttle position.

You are failing emissions because your car has a problem, most common MAF system related problem is boost leak, coated MAF, dead lambda sensor, dead temp sensor, worn engine ... or just dead cat.

satek · 10-05-2012, 08:58 AM

Retard your timing...worked for me.

project-c2 · 10-05-2012, 10:32 AM

Adjustable fpr?

marryson · 10-05-2012, 10:49 AM

Quote:

Originally Posted by project-c2

Adjustable fpr?

whats fpr?

Frank_Jaeger · 10-05-2012, 11:17 AM

Fuel pressure regulator.

marryson · 10-05-2012, 01:48 PM

Quote:

Originally Posted by Frank_Jaeger

Fuel pressure regulator.

I dont think mine is adjustable... but I passed the test today after running seafoam thru brake vacuum and intake. reduced nox by about 15%. I also changed the fuel filter too. and no i did not use a plastic bag to cover the filter lol

10-04-2012, 11:39 PM	#1
marryson Leaky Injector Join Date: Apr 2011 Location: Vancouver Age: 31 Posts: 67 Trader Rating: (0) Feedback Score: 0 reviews	Covering the air filter slightly with a plastic bag to pass emission test I just came up with this crazy idea..... my car keeps failing NOx which is caused by running to lean. (too much air, too little fuel). If i cover the airfilter slightly with a plastic bag, restricting the amount of air going into the engine. thus making the car run richer. and hopefully reduce the NOx reading. What do u guys think? will it work? what are the dangers?

10-04-2012, 11:43 PM	#2
jesse_s13 Nissanaholic! Join Date: Aug 2010 Location: Sacramento,CA/Fresno,CA/El Paso,Tx Posts: 1,829 Trader Rating: (5) Feedback Score: 5 reviews	__________________

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10-05-2012, 06:18 AM	#4
Croustibat Nissanaholic! Join Date: Aug 2011 Location: France - Toulouse Age: 41 Posts: 1,851 Trader Rating: (0) Feedback Score: 0 reviews	because your ECU measures air that enters and computes how much fuel it needs to send based on its mapping ... you are not running an alpha-N management system that computes how much fuel it has to send depending on the throttle position. You are failing emissions because your car has a problem, most common MAF system related problem is boost leak, coated MAF, dead lambda sensor, dead temp sensor, worn engine ... or just dead cat.

10-05-2012, 08:58 AM	#5
satek Leaky Injector Join Date: Jan 2010 Location: Vancouver BC Age: 30 Posts: 132 Trader Rating: (0) Feedback Score: 0 reviews	Retard your timing...worked for me.

10-05-2012, 10:32 AM	#6
project-c2 Leaky Injector Join Date: Jan 2012 Location: Honolulu, HI Age: 39 Posts: 76 Trader Rating: (4) Feedback Score: 4 reviews	Adjustable fpr?

10-05-2012, 11:17 AM	#8
Frank_Jaeger Zilvia FREAK! Join Date: Jan 2012 Location: Port Charlotte, Florida Age: 29 Posts: 1,352 Trader Rating: (1) Feedback Score: 1 reviews	Fuel pressure regulator.