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e30_kid89
11-10-2007, 06:40 PM
So my 90' golf failed emissions 3 times after i've given it a full tune up as well as a italian tune up. The thing that kills is that it passes on everything with flying colors except the NO ppm part on the 40 km/h test. Its not failing by a lot, its like 100 over the 800-something limit. Ive added like fuel stabilizer, SeaFoam and other crap. Any have any suggestions for lowering the NOx levels?

TIA.

papo
11-10-2007, 06:49 PM
Filler almost full with Sunoco 94.....then add 1 - 1 half litres of Gas Line Antifreeze.....run it for at least half an hour before you take it in to test. Make sure it is hot, then hand it over & hold your breath. This has worked everytime for my 87 e28. Good Luck & hope this helps!

BigD
11-10-2007, 06:58 PM
Did the tune-up include an O2 sensor replacement? If not, don't guess, just replace it.

Otherwise, drive it out onto the highway and boot it around for a half hour, like in 4th gear, heat the SHIT out of the cats, then go straight to the test (driving at high rpms and loads - within legal reason). Go during a non-busy time so you can go in right away, don't shut the car off whatever you do.

e30_kid89
11-10-2007, 07:16 PM
Good idea D. I never did the o2. I should do it for good measure. Btw i did all of those things (the driving in 4th on the highway, never turn it off @ the test center) and it still*thmbsdwn* . Hopefully the o2 can get it over the hump!

Axxe
11-10-2007, 08:31 PM
Hopefully it doesn't need a cat, but if it does, then just buy a universal magnaflow and clamp it in.

Eurostyle
11-10-2007, 08:54 PM
If you do need a cat, i have a very good VW cat...

Otherwise, i have a good place for emissions. They will tell you exactly what is wrong with it...

e30_kid89
11-10-2007, 09:03 PM
^^^Do they tell you before, or after you fail:D

Doing some moar reading it says the NOx is cause from high combustion chamber temps and or running lean. @ idlet it passes the same thing just fine. werid shit.:confused:

Eurostyle
11-10-2007, 09:14 PM
^^^^To me they tell whenever i ask!:D :D :D

static
11-10-2007, 09:29 PM
too much NO means the combustion is too hot; i.e too lean of a mixture, too much advance, hot intake air, and other factors to lesser degree.
I'd think changing your o2 sensor would be counter productive in this case (as when sensor die, ecu sees lean condition, so it adds fuel, which is what you need in this case). Follow the 94 oct sunoco gas advice (colder burn is what you need), maybe some octane booster. Antifreeze will cool the burn but will introduce more oxygen into the chamber, so not sure it will do more good than bad.
Check your fuel filter (maybe clogged), FPR, and distributor (if equipped) to see if timing had been tampered with (i.e advanced) or see if you can retard it few deg.

even such a small thing as coming to do the test on a humid day
could make big difference in your case (works like W/I with same effect of cooling and slowing down the burn)

e30_kid89
11-10-2007, 09:54 PM
too much NO means the combustion is too hot; i.e too lean of a mixture, too much advance, hot intake air, and other factors to lesser degree.
I'd think changing your o2 sensor would be counter productive in this case (as when sensor die, ecu sees lean condition, so it adds fuel, which is what you need in this case). Follow the 94 oct sunoco gas advice (colder burn is what you need), maybe some octane booster. Antifreeze will cool the burn but will introduce more oxygen into the chamber, so not sure it will do more good than bad.
Check your fuel filter (maybe clogged), FPR, and distributor (if equipped) to see if timing had been tampered with (i.e advanced) or see if you can retard it few deg.

even such a small thing as coming to do the test on a humid day
could make big difference in your case (works like W/I with same effect of cooling and slowing down the burn)

Thanks. i'll start checking that crap out.

EDIT: I dunno if it matters, but in the morning around 8ish was when it was closest to the limit. Car was warm and driven on the hwy before hand. As the day went on it got worse....

Axxe
11-11-2007, 12:03 AM
Wrong heat range spark plugs?

e30_kid89
11-11-2007, 12:40 AM
Not rly sure, I just took off the plug wires and took a look. They were bosch supers. Is there a more colder plug i would be able to run with?

e30er
11-11-2007, 12:49 AM
best thing is to just go to a place that does a visual inspection.. i've heard of it done before in rexdale some places.. im not sure tho.. ask about it

dtthiaga
11-11-2007, 01:22 AM
Ive added like fuel stabilizer, SeaFoam and other crap. Any have any suggestions for lowering the NOx levels?

TIA.

That's probably not a good idea to add Stabil or SeaFoam into your gas for an e-test.

At best, you want products that have more oxygen in it.

Burn off all the gas, put a bottle of fuel injector cleaner, and fill up with 94 Octane fuel. Use that up, fill up again with another bottle of fuel injector cleaner.

Run it on the highway for 30-40 minutes, then take it in for a etest.

VW are always hard to pass e-tests.

static
11-11-2007, 10:32 AM
in Devon's case, one needs less oxygen. Excess o2 + hot combustion = NOx

NickP
11-11-2007, 11:56 AM
Devon post all your numbers up... high NOx points to different things depending on different readings.

e30_kid89
11-11-2007, 12:02 PM
Here are the numbers:

http://i13.tinypic.com/6kjh577.jpg

EDIT: out of all the times i went the closest the NO ppm got to the limit was 959 PPM.

Jon@Bimmersport
11-11-2007, 12:02 PM
Sean Kingston....in a 90 golf? damn..

e30_kid89
11-11-2007, 12:04 PM
Sean Kingston....in a 90 golf? damn..

Johnny Blaze....in a M3 with only 177RWHP? damn:D

AceOfSpades
11-11-2007, 12:09 PM
lol:D

NickP
11-11-2007, 12:44 PM
the picture isn't showing up

e30_kid89
11-11-2007, 12:51 PM
Whoops there it is:

Jon@Bimmersport
11-11-2007, 12:52 PM
Johnny Blaze....in a M3 with only 177RWHP? damn:D

Sean kingston...ass beaten down at bimmersport? DAMN!

Eurostyle
11-11-2007, 02:07 PM
best thing is to just go to a place that does a visual inspection.. i've heard of it done before in rexdale some places.. im not sure tho.. ask about it


No, visual inspection is done ONLY on diesel engine cars...*no-no*

e30er
11-11-2007, 02:09 PM
No, visual inspection is done ONLY on diesel engine cars...*no-no*

i dunno i kno i had a friend do it on his car because his traction control wouldnt turn off or something.. maybe im wrong

BigD
11-11-2007, 02:40 PM
Dude all of the numbers suck. Just replace the O2. It's not expensive and easy to do, why is there a debate? If it still fails then look for other solutions.

Eurostyle
11-11-2007, 09:08 PM
i dunno i kno i had a friend do it on his car because his traction control wouldnt turn off or something.. maybe im wrong

No, something sounds wrong again...Even cars that cant go on the dyno (like full time all wheel drive) have to get tested (in park reving) and at idle...

e30_kid89
11-12-2007, 12:15 AM
Well, I dug into the car again this time to check the timing. Got a timing light to check it out and i found the timing was a bit advanced so i retarded the timing back to spec and the car does run a wee bit better now...I hope its the little thing i need to pass!

propr'one
11-12-2007, 09:04 AM
Devon, i'll be back in toronto tonight. If you want some help, lemme know. I have a half bottle of methyl hydrate left over. hit me on msn.

BennyL
11-12-2007, 11:05 AM
let us know if changing the timing fixed the issue! keep us updated.

e30_kid89
11-12-2007, 12:48 PM
Well i gotta say.......

NICKP FTMFW!!!!!!!!!!!!!!!!!!!!!

He had suggested the high numbers ment that the timing was off.

I got lazy and didnt wanna check

He kept on bothering me to do so, so i got a timing light (sooo cool i love it)

and re-adjusted the timing,


and today it PASSED!!

Well below teh limitz

Now i owe beer/hoes/prostitutes to Nick and everbody else who threw in suggestions here and there. Thanks guys! The E30 can finally sleep!

Woot!

NickP
11-12-2007, 12:52 PM
To everyone else who posted on this thread - you were wrong.
Your posting privileges have been revoked for the next 24 hours :D

Axxe
11-12-2007, 12:54 PM
Not all of us owned carbed oldsmobiles :P

static
11-12-2007, 05:24 PM
... too much advance...

...and distributor (if equipped) to see if timing had been tampered with (i.e advanced) or see if you can retard it few deg...



:(

glad you got it fixed anyway *th-up*

Boots R
11-12-2007, 05:51 PM
Now i owe beer/hoes/prostitutes to Nick...

Please forward all beer/hoes/prosti-tots in my direction, as I will be NickP's official Toronto claimant.

e30_kid89
11-12-2007, 06:10 PM
:(

glad you got it fixed anyway *th-up*

Gotta thank you too Alex, I think the foggy humidish weather helped too. Another reason why I thought to go in today since you had mentioned the whole water injection cooling down combustion temperatures, i thought the fog would do the same! Hard to say that it did or it didn't but it passed. I will get you a set of prostitues and beer as well!

Axxe
11-12-2007, 07:34 PM
Beer and hoes for Nick and Alex.

bmwm5lover
11-12-2007, 07:36 PM
How good are you at setting timing????

Axxe
11-12-2007, 07:38 PM
BTW, what were your final numbers? How off was the timing?

e30_kid89
11-12-2007, 08:16 PM
Final numbers were the same in all sections except the CO% and the damned NO ppm dropped to 0.26 and 703. I found the ignition was too advanced so i set it back to stock which is 6 degrees BTDC. Impossible to do without the Timing gun i got. Terry it depends but im sure it'll be pretty easy with the gun and a manual/write-up. I got the timing for the Vdub dead on.

bmwm5lover
11-13-2007, 12:51 PM
My truck needs to be 6 btdc. I need someone to take a look at it in the spring for me after I do my exhaust.
Ill let you know.

propr'one
11-13-2007, 12:56 PM
Did you buy the timing gun or borrow it from partsource?