kv007

iTrader: (1)

just went to get it smogged and it failed the idle test for HC(PPM) measure 184 max allowed is 100. on my 99 firehawk. brand new cat on the right side too which is the tailpipe he tested on. what in the world could make it this bad? it passed all the others.

garygnu

you mite need to clean your MAF,also clean the IAC .

got-a-ls1

iTrader: (12)

doesnt matter which side he tested... its all one after the y pipe.

kv007

iTrader: (1)

figured. i cant figure this out. some people say to run your car very low on gas and then put "dry gas" in it. heard of that?

TheSilverOne

iTrader: (22)

move out of that communist state!

BubaGumpShrimp

iTrader: (1)

i would seafoam the car (look on youtube if you dont know) and put some chevron techron cleaner in the tank, drive it for 1/4 of the tank then go back..

CamaroZ28_LS1

iTrader: (5)

who the hell does tail pipe emissions on an obd-II car???

RJDio

CA smog tests the emissions and if it fails they should tell you what it needs to pass and there are rules that govern how much they can charge for the labor, etc. This is very very common to fail emissions there, which is why you should just buy a lid and cat back only - NO TUNE. I lived there for 18 years and am so happy to be out of that communist state, the testing computers communicate with the State computers, they know when you fail. I'd let the testing shop perform the 'repairs', because if they can't get it to pass they will pass it anyway by taking the car out of neutral or park and putting it into drive, lowering the rpm's and getting a pass from the computer - at least that is the only way they got one of my cars to pass smog before I moved.

kv007

iTrader: (1)

okay thanks. i think i may have an exhaust leak do you think that could make it fail? should i replace all my spark plugs>?

BLKLS1CAMARO

iTrader: (1)

has your MPG dropped? because my 98 ss failed the same thing. all i did was clean the TB MAF with MAF cleaner of brake cleaner.(all do the same) and got a new K%N filter i think i replaced the spark plug cables and it passed flying colors.

kv007

iTrader: (1)

ive only had it for about 2 months so cant tell if its dropped. ive ordered new ngks and some rpm speed wires so hopefully fixes the problem. i can use brake cleaner on my maf?

kv007

iTrader: (1)

okay heres two pics from my little scanner. the o2 one is me revving my car at 1200 rpms. can someone explain to me why it jumps up and down

Red89GTA

The front o2 should look something like that. Narrow band o2 sensors can only detect 14.7:1 air:fuel, so the computer has to contiually make the mixture alternate between rich and lean (though in a very small window).

to pass smog, make sure your air filter and maf are clean, ck the plugs, if worn replace them and make sure to get that thing hot on the drive into recheck. Like a quick trip down the highway.