The previous owner failed the smog check yesterday.

The result:

M1. 15MPH
HC: MAX 88 AVE 21 MEAS 28
CO(%): MAX 0.52 AVE 0.06 MEAS 0.08
NO(PPM): MAX 704 AVE 150 MEAS 775

M1. 25MPH
HC: MAX 53 AVE 13 MEAS 24
CO(%): MAX 0.50 AVE 0.05 MEAS 0.13
NO(PPM): MAX 738 AVE 136 MEAS 507

My friend help me to do the regular maintenance services after I brought the car.

We did:

Change engine oil and oil filter
Flush coolant and fill in 50/50 coolant
Clean fuel and change fuel filter
Replace air filter
fill up 91 Octane

I just smogged the car today and it failed.

M1. 15MPH
HC: MAX 88 AVE 21 MEAS 41
CO(%): MAX 0.52 AVE 0.06 MEAS 0.12
NO(PPM): MAX 704 AVE 150 MEAS 784

M1. 25MPH
HC: MAX 53 AVE 13 MEAS 31
CO(%): MAX 0.50 AVE 0.05 MEAS 0.10
NO(PPM): MAX 738 AVE 136 MEAS 432

How do I pass the NO(PPM) with 15mph? Any suggestion? Replace O2 sensor, catalytic converter?

Thanks!

Modified by supra33202 at 12:15 AM 4/14/2008

I'm not 100% sure, but I think that filters most of the NOx emissons.

Possibly the cat. converter too, but thats more likely to fail at both speeds I would think.

Thanks!

"The EGR valve diaphragm should lift up and down without restriction."

How does EGR valve diaphragm look like? Is it like a gold-colored, round-shape metal plate?

I checked last night, but I am not should how high will the valve diaphragm lift up?

http://img233.imageshack.us/my...5.jpg
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Modified by supra33202 at 1:48 PM 4/10/2008

If that is the case, what should I do?

I don't how old is the whole exhaust system. I think it is at least 5 years old because of the rust and stock looking.

Assuming, the previous owners never replace the exhaust system. I believe I should just replace the cat.

Would replacing the muffler help the emission?

Thanks!

I would run the var very low on gas, just under a 1/4 tank, then add 2 gallons of denatured alcohol, can be bought at Ace Hardware or Home Depot etc. Won't hurt the car at all, but it burns way cleaner then pump gas. Swap the O2 sensor, retard your base timing clean the spark plugs and before you have the car tested, have it at full operating temp. The hotter the cat, the more it filters.

I've done the alcohol trick for years and always passed, with no cat

Truth is Treason in the Kingdom of Lies - Ron Paul

http://forums.nicoclub.com/zer...age=1

1) We tried to remove the EGR valve entirely, but we don't know exactly how. Basically, we just removed the EGR valve vacuum hose and spray some Pryroil Carb&Choke Cleaner in it. We also sticked out finger in the bottom of the EGR valve and lift up the diaphragm while the engine is running. The engine stumbled, so we believe the EGR valve is working. Is there a easy way to remove the EGR valve from the car entirely? I want to clean the inside parts of the EGR valve. What nuts do I have to remove first? And what other parts do I have to remove first?

2) Then we seafoamed the car. We followed his steps:

33% gas tank, 33% crankcase. 33% intake manifold through brake booster line. I have a question here. Why the brake booster line will connect to the intake manifold? What is the purpose? And why there are other vacuum lines connect to the intake manifold?

http://forums.nicoclub.com/zer...age=1

Compare with other cars on youtube, my car doesn't have alot of smog coming out from the exhaust. Do we need to pour one more bottle of Seaform? If we decided to pour 1/2 bottle to intake manifold and 1/2 bottle to gas tank, do we have to do oil change and change the oil filter again? My friend said we don't have to change the oil and oil filter, but I argued that the seafoam will make the engine oil thinning. So, changing the oil and oil filter is needed after each seafoam regardless where we pour into.

That is all we did.

3) "ok, do this, add a bottle of isopropyl alcohol to about a half filled gas tank, drive it around a bit to get it mixed and in the fuel line. alcohol lowers combustion temperatures thus NOx levels will be lower. also, nox resolved from running lean which is one of the symptoms. get the highest percent isopropyl alcohol and try again, get around 90% because the other 10 percent is water, though water is not combustable, it will dilute enough to not cause any harm. also, try retarding your timing a few degrees. that may help. these are just cheap/money free possibilities. the alcohol wont hurt your engine, just dont use more than 1 bottle..about 16 ounces

Let me know if this works for you. i bet it will. pm me or something"

Do you thing pouring alcohol in the gas tank will help emission?

Thanks!

2) Will retard ignition time help emission? How does it work? And how do I adjust the timing?

Thanks!

Thanks!

Higher octane gas isn't always a good thing as not all of it might burn. I'd really use the alcohol idea.

The ignition timing shouldd be 100% fine at stock.

Alcohol doesn't release near the amount og hydro carbons as gas when burned, it's also an oxygenate. Which means it releases oxygen when burned which is also a good thing.

Wanna pass emissions? Here's the checklist to follow...don't ask how to do it...look it up...and don't ask if it works...I wouldn't waste my time posting it if it didn't. If your car still fails, then you have something wrong that needs fixing.

New or cleaned plugs
Inspected or new plug wires
New O2 sensor, generic Bosch sensors are like $12 iirc
Seafoam intake
Run 2 gallons of denatured alcohol with the car under a 1/4 tank of gas
Run the lowest octane available for the test itself, low octane burns easier

WD

I tried Home Depot, Lowe's, and Ace Hardware websites, but I can't find "Denatured Alochol",

please don't retard your ignition. it will just enrichen your mixture, so there really is no benefit to that.

Also, Home Depot and Ace sell the denatured alcohol IN the store.

WD

Pops runs a bottle of isopropyl alcohol in his tank to pass, works every time, and won't pass without it.

however I had tried in on my 240 a year ago after it wouldnt pass and the sniffer wouldn't even pick it up... so it failed, both times

I should've used denatured lol...

So this year, I used 2 gallons of denatured alcohol. However, I failed this year.

Please help!

http://nico.zeroforum.com/zero...42694