RedSmyles

Help guys 2day I went 2 get my car etested. It failed. The mechanic said my nox were 2 high everything else was fine.Otherwise everything else passed. All he said is that my nox were 2 high. I need some help 2 identify the problem.

Thanx

dsquintz

red font makes my eyes bleed

xxBvanxxx

If you find its the o2 sensor give me a shout i can get you one for a really good price. i pmed you my cell.

DOHCnoTEC

NOX is engine combustion temp. usually cat ***** that reading up.

post your numbers. or did you pay for etest and the guy just told you it failed and never gave you a sheet? Lol.

RedSmyles

Limit is 757, my reading is 2335 for the nox.

xxBvanxxx

same ---- happened to my bros car an his head gasket was gone lol.... but it all depends. could be something small, could be something big.

xxBvanxxx

if u need an o2 sensor give me a shout.

zman

wow bvan....husslin o2 sensors much? lol.

High Nox levels can be caused by too much air in the exhaust system (too lean) or from a messed up cat or a bunch of other reasons.

What were the other readings?

esguerra

like zman said, high NOx readings can be result from running too lean, or a fucked up cat...usually with a reading that high, i would suggest getting either a "legit" test (easiest option), or get it properly diagnosed and get the repair cost limit if you like...

VTEC_Inside

Cat is most certainly part of the problem with a NOx number that high.

RedSmyles

Yeah I change the cat and it still failed. I'm just fed up.

zman

I'd just pay a certified emissions repair place to fix it, they'll know what to do with the tools they have available.

I've seen lots of people change the cats with minimal effects on the emissions test results.

I'd check the spark plugs, plug wires, pcv valve, air filter, check and adjust the base timing with a timing light, check the valve adjustment.

Also make sure to take the car for a nice long drive to get the cat really hot before going for your etest. Try to get there as close to the time they'll be performing the test as possible, this will help keep your cat nice and hot to make sure its working efficiently.

VTEC_Inside

FYI, you have to drive the car a couple hundred kms before a new cat will really be working properly.

VTEC_Inside

Any particular place in mind? I ask because I'm aware of several cases where people have been hosed because the shop they went to didn't know ----.

A Honda dealer couldn't figure out why my Accord wouldn't pass at one point. I discovered in the end that it was nothing more than a disconnected sensor. Suffice it to say that I have fairly low expectations of shops these days.

I don't doubt the experience of the average mechanic, but you will find very few good troubleshooters.

RedSmyles

Guess what...my o2 sensor wire was cut. Reconnected it and the car passed like it just came from the factory.

Thank 4 all the inputs!

dsquintz

non-VTEC

who would cut the wires for the o2 sensor? why would they do that? did you not notice the check engine light on before you went for an initial test?