In the more populated areas in IL we do dyno/sniffer testing. Two parts; simulated city then highway driving. Test type was IM240.
Test for HC, CO and NOx. Passing standards are set for the first two. The last is advisory.
Limits for a 92 SE-R are 15grams CO and 0.8g HC. Failed the CO by pumping a 17somethin. >=(
HC was half allowed. =D
In the past year+: New plugs, wires, rotor cap, cat, air filter, exhaust, good gas, timin chain tensioner, 17' adv and runs up to redline often. EGR/BPT vacuum plugged (questionable diaphram on EGR). Vacuum great and compresion good.
Bad side is i know i have a slight random misfire. Been with me for quite a while hence the thorough maintinance above. I'm thinkin subpar F injector might have somethinto do w/ it
Also the AIV(?) valve above the exh manifold, the one that allows fresh air INto the manifold, occasionaly farts OUT. Can the reed valve inside be cleaned or do i need to replace?
Thinkin these should clear up the CO problem.
Comments? TIA

YEah you can change the reed valves, you should try it might be your problem.

It's possible that is your problem. Make sure your running NGK plugs. could be a little clogging in the injectors. Nissan tech said that YOU CAN USE a mild in tank cleaner on gallery fed injectors like Chevron Techron!!!!!!! Last think is a possible vacuum leak. This will cause odd idle and bad emissions. I flew through emissions once the EGR was removed. Barely passed since car was new now no problem. :rolleyes: EGR does not work....!!!!! It's an outdated system like the cat which we only have because we have horrible gasoline. Good luck bloke.

Cossie :rolleyes:

Drive the hell out of your car before you go there. At my job we had a work truck fail emissions, took it out for a half hour of sustained 80+mph, passed with flying colors. Worth a try.

Yeah get you car running crazy hot, and quick take it in. I did that for a crx i had a while ago. It actually worked

Hey paul im also from illinois and yeah they can be anal rentetive with these damn emissions testing, back when i 1st got my SE-R i didn't know about the emissions shit so i took it in and yeah i too had the same prob , it failed like i failed math in high skool, so when i went and had the diagnostic on it turns out i had a fried CAT, i changed that and just to be on the safe side changed the O2 sensor too , drove it around like crazy and right away took it to get tested, nervous as all hell like having my G/F take a pregnancy test, i waited and yep turns out my baby passed with flying colors, so to celebrate i went and got drunk, i might not advise the drinking part to celebrate, but in any case this should do the trick..........good luck

WoooHooo!!!!!!
Went in kinda late this morning and was worried the line would be long. It wasn't, Cool! I did it as a 'voluntary' first. They test it, but it doesn't go on my records. I wanted to do that cause after three official failures (i had two at the point) they need to pop the hood and do an inspection. I'd have to come up w/ CARB exemtpions for the CAI, the exhaust, the CAT, etc.. My engine is healthy and i maintain it well, so it SHOULD pass w/ the mods i have dammit.
I passed, just squeaked under on HC 0.626g(std 0.628) and flew thru CO, 2.61g (std 4.34). That one didn't count ***. I looked, still no line. The tech said to just pull it back around and take it officially. Flew around the block, they waved me thru, WTF. Said i hadn't filled out my repair info on my form from my previous failure. Idiot monkeys, must not be allowed in the office. GRRR
By the time i went IN to the office, got the form reprinted and pulled back around the cars were 5 deep w/ a 20 min wait time, ARRGH!
Last time this happened my car had run way hot (temp gauge almost up to the red) and failed miserably CO more than double the allowable. Later i noticed i had popped a Vac line too (doh).
I wasn't taking any chances this time, blasted the heat and revved the heck out of it when i was the next to go on the rollers (keep the cumbustion chamber cool keep the exauhst hot). I also sat in the car while the guy ran the test. Kept the heat ON (i was pissed at this point). Did i mention it's in the high 80s today here in Chi-town.
TADA. Teddy passed.
0.657g HC (std 658g) and 1.98g CO (std 4.53g). While i'm not sure exaclty why, my 'standard' allowable pollution was different every time xcept for the first two. (See first post). I figure it has to do with the total 'miles driven'.
Well and the age of the car/mileage?
They run the car and as soon as it shows it's OK during the city simulation they conclude the test and pass ya. The longer they run the car, the longer you have to pass, and the higher yer limit until they finish the highway portion.
Thanks for the advise guys, while i didn't do all of it. My Cat is only a couple of month old Catco so i wasn't about to touch that. I've been planning on pulling the fuel rail and taking the injectors in for a FULL cleaning (for performance reasons mostly =D) so i skipped on the cleaner (still may do it if i don't get the time to pull em). If i had failed again that would have been my next step.
I did reconnect the Vac line between the EGR & BPT to reactivate the system. Replaced a couple of questionable other ones (like the little one that popped off on my 2nd failure).
Tripled the length of the highway run beforehand.
I also got new plugs just cause i'm anal like that and even *** i get the Platinum NGKs mine were 2 years old. I always thought (WRONG) that the gap was set correctly at the factory. Set 0.01in+ too much for my SR20. =O
What i also DIDNT do is back my timing off to 13-15 from 18.
I'm not sure which did it but i went from failing on CO to being a quarter of the allowable limit. Interesting, the BMW passes the same way. Just passing on HC 0.130g, std 0.135g (a little better, by 0.005 under as opposed to 0.001-2 for Teddy) and less than half the allowable on CO 0.407g out of 0.851g. The wagon passes quiker and it's newer. It does have over 100K miles too *** and the exhaust is all original. Although i may be poppin on either some slip-on 'rechrome' tips (exactly like the OEM xcept SHINY) or a just slightly sportier muffler. The bimmah is little on the quiet side.
I am psyched that the SE-R runs legal. While it's not a movin violation to be drivin a car w/ suspended plates, it's still a hassle and at least 'court costs' $$$.

Cost this way?
Plugs, $60. Vacuum line, $0.50. Gas for a coupe a miles of highway w/ lots of on/off ramps =D, $0.10? Advisory test, $20.
Passing AND Doin It Yerself. Priceless.
I'm out, where are those headers i haven't installed yet?
Stillen G1, should pass next time too.


Paul (yeah, i'm a nut)
92 Sentra SE-R; Teddy, Daily driveR, Weekend warrioR.
94 530iT&A; Helga, Formal Wear, Schleppen Schnell.
pavlo@interaccess.com

As an FYI:

High CO means rich. High HC means way rich. You can't have high HC without high CO. Look at O2 sensor(s), fuel pressure, cat, injectors, ECU in that order.

High NOx means cylinder conditions too hot. Could be timing too advanced for available octane, non-functioning EGR, lean (unmetered air or less fuel than expected), high compression due to carbon fouling in combustion chamber in that order.

Originally posted by Jackson Diamond
Yeah get you car running crazy hot, and quick take it in. I did that for a crx i had a while ago. It actually worked
\
Very odd. My 92 failed, and they let my car cool, and it passed no problem. I wonder why??

Originally posted by Rob

\
Very odd. My 92 failed, and they let my car cool, and it passed no problem. I wonder why??

The cat needs to be hot to work it's best. High engine temps on the other hand will cause pre-ignition and incomplete fuel burn. (see previous post)

____________________________________
Paul (yeah, i'm a nut)
92 Sentra SE-R; Teddy, Daily driveR, Weekend warrioR.
94 530iT&A; Helga, Formal Wear, Schleppen Schnell.
pavlo@interaccess.com

High engine temps on the other hand will cause pre-ignition and incomplete fuel burn.

High engine temps might cause pre-ignition. High temps will enhance fuel combustion, often to the point of detonation. Incomplete fuel burn means one of three things:
not enough air
very retarded timing
extremely high engine speed (on the order of 20,000 rpm)

Originally posted by Slartibartfast


High engine temps might cause pre-ignition. High temps will enhance fuel combustion, often to the point of detonation. Incomplete fuel burn means one of three things:
not enough air
very retarded timing
extremely high engine speed (on the order of 20,000 rpm)


Thanks for the clarification Bruce.
BTW, Mr Hearn from the mailing list i presume?
Good to see you here as well.
____________________________________
Paul (yeah, i'm a nut)
92 Sentra SE-R; Teddy, Daily driveR, Weekend warrioR.
94 530iT&A; Helga, Formal Wear, Schleppen Schnell.
pavlo@interaccess.com

Mr Hearn from the mailing list i presume?

Ayup. Thanks for the welcome.

So uh, it happened again.
I failed, miserably.
Then.....................i passed.
Ooooh yeah, time for a big ass martini.

This is on ‘Jenny’, the new classic hotness: PR wai, $tillen 4-2-1 headers (on their 4th car?), Catco cat (2 years) and HKS exhaust. Stock timing, disabled EGR/BPT. Details to follow.
Where’s my shaker?


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93 SE-R---94 530iT&A---92 325i ….”Hang up & Drive!” (http://homepage.interaccess.com/~motria/pablosgarage.html)
”It is not the function of our government to keep the citizen from falling into error;
It is the function of the citizen to keep the government from falling into error."--Robert H. Jackson.

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