tricks to pass emissions?
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Old September 23rd, 2008, 03:20 PM   2 links from elsewhere to this Post. Click to view. #1
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tricks to pass emissions?


i failed emissions with my 89 gt, with cats and smog pump wtf!

so im going to put fresh 93 octane gas a lil octane booster, i want to retard the timing and heat those cats REAL hot b4 i go again, any other tricks?
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Old September 23rd, 2008, 03:25 PM   #2
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set the timing to stock which i think is 10 degrees, drive the fuck outa ur car first to get them hot, if you have to sit in line sit with the rpm at like 2500 to keep them hot, dump a bottle of rubbing alcohol in ur tank
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Old September 23rd, 2008, 03:34 PM   #3
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Rubbing alcohol works well..... Dont use 93....use 87....... 10 degrees....get the cats hot... like said above....

If any of the tricks dont work..... Unplug an injector
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Old September 23rd, 2008, 03:57 PM   #4
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or unbolt the exhaust a little, or put some ethanol in, or have a mechanic write you up a slip
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Old September 23rd, 2008, 04:04 PM   #5
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Originally Posted by baine21225 View Post
or unbolt the exhaust a little, or put some ethanol in, or have a mechanic write you up a slip
I heard something about this....how do you go about doing this....?

Are you exempt from emissions if you have a mechanic write up something?
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Old September 23rd, 2008, 05:31 PM   #6
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Originally Posted by EscortSportage View Post
i failed emissions with my 89 gt, with cats and smog pump wtf!

so im going to put fresh 93 octane gas a lil octane booster, i want to retard the timing and heat those cats REAL hot b4 i go again, any other tricks?
Retard the timing, run the tank almost dry, get the cats real hot, then pour in a litre of methyl hydrate. Car will smell like vodka, and you'll pass unless you have serious issues...
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Old September 23rd, 2008, 06:15 PM   #7
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go to a shop that will pass it for you...

theres places all over... here in cali i go to this place like 15 mins away and that pass mine... check my sig ... my shit aint gonna pass a normal inspection.
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Old September 23rd, 2008, 06:29 PM   #8
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Swap windshields with a car that passed.
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Old September 23rd, 2008, 06:37 PM   #9
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if its anything like here in NC, then you cant just get a sticker as the guy has to type your vin in when he checks car. Plus they dont even put the probe in the tailpipe either, they just plug into your computer and it tells how its running, but thankfully anything older than 10 years old now doesnt have to pass emissions.
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Old September 23rd, 2008, 09:57 PM   #10
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Originally Posted by threetime View Post
if its anything like here in NC, then you cant just get a sticker as the guy has to type your vin in when he checks car. Plus they dont even put the probe in the tailpipe either, they just plug into your computer and it tells how its running, but thankfully anything older than 10 years old now doesnt have to pass emissions.
I was gonna say, if it won't pass simply because the motor is too wore out, that's a good excuse to build a new one.
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Old September 23rd, 2008, 10:06 PM   #11
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Originally Posted by 93mustank View Post
I heard something about this....how do you go about doing this....?

Are you exempt from emissions if you have a mechanic write up something?
in MD if you have a mechanic write you a slip saying you spent xx amount of $$ trying to make your car pass( i think its around 400 here) then they wave you off, unbolting the exhaust is pretty self explanatory, and the ethanol burns cleaner so it puts out less emissions....you mix it with gas, even though most gas has a % already, you just add more
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Old September 25th, 2008, 10:24 AM   #12
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damn so difficult i have about 4 shops that's you just pay them 100 bucks and they pass you. you don't even need to bring your car just the registration lol
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Old September 25th, 2008, 11:40 AM   #13
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How many of these "tricks" really work? Sounds like a lot of he said, she said or someones uncle had a friend that did something like that and it "worked".
I just failed an emissions test myself. The tail pipe reading was good but because I had an "invalid PCV system", he failed it. I have a SC so I have a breather on the valve cover and the line to the TB capped. What a dick. I had both of my Mustangs there at the same time and I was going to swap it right there in the parking lot and ask for an immediate reinspect but I didn't.

I wish I had a hookup though. Northern VA is tough. 25 years and newer has to be checked every two years and all of the places I've been to actually take the visual part of the test serious. There is very few exceptions and low mileage per year isn't one of them. If the car does not have OBDII (96 and newer), it is attached to a dyno and run at idle, 15, and 25 and various things checked along the way. The results are sent directly to the DMV electronically and you can not register the car until it passes.
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Old September 25th, 2008, 01:23 PM   #14
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Originally Posted by nolife View Post
How many of these "tricks" really work? Sounds like a lot of he said, she said or someones uncle had a friend that did something like that and it "worked".
I just failed an emissions test myself. The tail pipe reading was good but because I had an "invalid PCV system", he failed it. I have a SC so I have a breather on the valve cover and the line to the TB capped. What a dick. I had both of my Mustangs there at the same time and I was going to swap it right there in the parking lot and ask for an immediate reinspect but I didn't.

I wish I had a hookup though. Northern VA is tough. 25 years and newer has to be checked every two years and all of the places I've been to actually take the visual part of the test serious. There is very few exceptions and low mileage per year isn't one of them. If the car does not have OBDII (96 and newer), it is attached to a dyno and run at idle, 15, and 25 and various things checked along the way. The results are sent directly to the DMV electronically and you can not register the car until it passes.
The retarded timing/methyl hydrate worked for me on my blower car. It kept failing the NOx no matter how hot the cats were. That being said, everything was in tip top shape.
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Old September 25th, 2008, 02:05 PM   #15
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In general... when you only have high NOx, this is from running lean, high combustion temps, or EGR. So yeah, a "hotter" cat or engine is not going to help. When lean (more o2 in the mix) the cats are better at reducing CO and hydrocarbons and not as good with NO. That was kind of my point with all of these home remedies for passing an emissions test. Some may or may not "work" but i find it odd that random advice is given without any indication of what portion of the emissions test actually failed. Funny as I searched for methyl hydrate and emissions and a lot of people claim it only helps with high HC and CO, not for NOx. You used it for NOx and it appeared to work.
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Old September 25th, 2008, 05:29 PM   #16
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Originally Posted by nolife View Post
In general... when you only have high NOx, this is from running lean, high combustion temps, or EGR. So yeah, a "hotter" cat or engine is not going to help. When lean (more o2 in the mix) the cats are better at reducing CO and hydrocarbons and not as good with NO. That was kind of my point with all of these home remedies for passing an emissions test. Some may or may not "work" but i find it odd that random advice is given without any indication of what portion of the emissions test actually failed. Funny as I searched for methyl hydrate and emissions and a lot of people claim it only helps with high HC and CO, not for NOx. You used it for NOx and it appeared to work.
Yeah it lowered my NOx readings by about 50%. That being said, I've found other ways to pass emissions every second year now.
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Old September 26th, 2008, 08:20 AM   #17
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Originally Posted by nolife View Post
In general... when you only have high NOx, this is from running lean, high combustion temps, or EGR. So yeah, a "hotter" cat or engine is not going to help. When lean (more o2 in the mix) the cats are better at reducing CO and hydrocarbons and not as good with NO. That was kind of my point with all of these home remedies for passing an emissions test. Some may or may not "work" but i find it odd that random advice is given without any indication of what portion of the emissions test actually failed. Funny as I searched for methyl hydrate and emissions and a lot of people claim it only helps with high HC and CO, not for NOx. You used it for NOx and it appeared to work.
i only posted suggestions, all of which either my dad or myself have tried, and i was just giving a quick answer to a quick question because no information was given on what part of the test he failed
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