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Old 11-10-2007, 06:40 PM   #1
e30_kid89
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Stupid beater.

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.
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Old 11-10-2007, 06:49 PM   #2
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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!
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Old 11-10-2007, 06:58 PM   #3
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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.
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Old 11-10-2007, 07:16 PM   #4
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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 . Hopefully the o2 can get it over the hump!
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Old 11-10-2007, 08:31 PM   #5
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Hopefully it doesn't need a cat, but if it does, then just buy a universal magnaflow and clamp it in.
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Old 11-10-2007, 08:54 PM   #6
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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...
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Old 11-10-2007, 09:03 PM   #7
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^^^Do they tell you before, or after you fail

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.
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Old 11-10-2007, 09:14 PM   #8
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^^^^To me they tell whenever i ask!
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Old 11-10-2007, 09:29 PM   #9
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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)

Last edited by static; 11-10-2007 at 09:38 PM.
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Old 11-10-2007, 09:54 PM   #10
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Quote:
Originally Posted by static View Post
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....
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Old 11-11-2007, 12:03 AM   #11
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Wrong heat range spark plugs?
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Old 11-11-2007, 12:40 AM   #12
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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?
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Old 11-11-2007, 12:49 AM   #13
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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
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Old 11-11-2007, 01:22 AM   #14
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Quote:
Originally Posted by e30_kid89 View Post
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.
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Old 11-11-2007, 10:32 AM   #15
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in Devon's case, one needs less oxygen. Excess o2 + hot combustion = NOx
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