'94 Sentra LE failed NJ emissions - Nissan Forum
GA16DE 1.6L Engine Engine Discussion: 91-99 Sentra, 95-98 200SX, 91-93 NX1600

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post #1 of 24 Old Jun 23rd, 2005, 03:28 PM Thread Starter
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'94 Sentra LE failed NJ emissions

Hey brand new guy here...go easy.

I'm sure all this info. is already posted and I WILL look for it. In the meantime...

So my sister got a new Altima about 2-3 years ago and has been letting her 1.6L Sentra rot in her driveway ever since. She finally gave it to me last Saturday for kicks.

It wasn't running and had 1/4 tank of at least 1 year old gas in it.

Anyway I put in a battery, an air filter, and new wiper blades and drove it to the gas station by her and filled it with 89 octane gas. I then proceeded to drive it 90 miles home.

A day or so later I took it to inspection at NJDMV and is passed...except for emissions, but not by much.

Since then I've gotten the oil changed, installed new spark plugs and wires, and a new cap and rotor, and a PCV valve. I also used 1/2 tank gas so I filled up with 93 octane and put in a bottle of Chevron Techron fuel injector cleaner.

I can't go back until I get my legit ins. card anyway so this FI cleaner will have a chance to work.

My question is...are there any readily and easily checkable, frequently failing, known emissions parts on this car that go out regularly? Such as an easy way to check an EGR valve or oxygen sensor to make sure all is well.
Or are there more tune-up parts I missed?

I'm pretty good with cars, but totally unfamiliar with this model...so any guru advice is quite welcome.

I'm hoping the tune-up does it, but am looking for those 1-2 "known issues" you guys prolly know about.

FYI it's the 1.6L, 5spd, Limited Edition, with 89k miles.

Thanks guys!
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post #2 of 24 Old Jun 23rd, 2005, 11:07 PM Thread Starter
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don't all respond at once...
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post #3 of 24 Old Jun 23rd, 2005, 11:10 PM
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Did the state exactly what it didn't pass, or did they just say emissions?

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post #4 of 24 Old Jun 24th, 2005, 10:17 AM
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Any visible smoke coming out of de tailpipe? Or rich smell (kinda like the 70's car smell)? Here's a funny thing to do, disconnect your oxygen sensor and see if your car runs better/faster. If it does, get a new one

93 Sentra XE 5spd, running well... 82 924 Turbo under construction... 82 Suzuki GS650G, under construction... 76 Firebird Formula 5.7, waiting for the next summer.
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post #5 of 24 Old Jun 24th, 2005, 11:47 AM Thread Starter
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Quote:
Originally Posted by jswatson
Did the state exactly what it didn't pass, or did they just say emissions?
No they gave a readout on all the various gas levels and the 2 that were over the limits. I believe it was CO2 and NO that were over, but I'll post the entire report for your viewing pleasure sometime this weekend. Please keep an eye out for it. Thx.
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post #6 of 24 Old Jun 24th, 2005, 11:50 AM Thread Starter
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Quote:
Originally Posted by Petrovich
Any visible smoke coming out of de tailpipe? Or rich smell (kinda like the 70's car smell)? Here's a funny thing to do, disconnect your oxygen sensor and see if your car runs better/faster. If it does, get a new one
no smoke...no funny smells. since I just got car I don't have the manual yet...where is oxygen sensor?
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post #7 of 24 Old Jun 24th, 2005, 11:55 AM
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On the exhaust manifold, right smack dab in the center, closest to you when looking at the engine bay, below the valve cover but in front.
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post #8 of 24 Old Jun 24th, 2005, 04:05 PM Thread Starter
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Quote:
Originally Posted by wildmane
On the exhaust manifold, right smack dab in the center, closest to you when looking at the engine bay, below the valve cover but in front.
thx...i think i know what you mean. just by looking at it i assumed that was an exhaust gas temp. sensor.
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post #9 of 24 Old Jun 24th, 2005, 04:20 PM Thread Starter
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Quote:
Originally Posted by jswatson
Did the state exactly what it didn't pass, or did they just say emissions?
as promised...the report.

FINAL RESULT: FAIL
Inspection Performed: ASM 5015 Enhanced Emissions Test and Safety
Inspection Results: Safety: Fail OBD/Emissions: Fail

Gas.....Standard...Reading...Result
NOx.....1186........1285.......FAIL
HC.......152.........158.........FAIL
CO%....0.85.........0.46.......PASS
CO2%...X............12.9.......X
O2%.....X............1.1.........X
RPM......X............0...........X
Gas Cap...........................PASS
Tampering........................PASS
Visible Smoke....................PASS

X's indicate a blank space so I guess NJ doesn't care or check that data.
Do you guys think a tune up is enough to drop those first 2 #'s?


Last edited by tmcnally; Jun 24th, 2005 at 04:26 PM.
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post #10 of 24 Old Jun 24th, 2005, 04:50 PM
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Quote:
Originally Posted by tmcnally
don't all respond at once...
The forum rules, which I am sure you read before posting, state that you are not allowed to BUMP your own thread for 24 hours. Honestly people have lives outside the forum and when people are able too they will respond.

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post #11 of 24 Old Jun 24th, 2005, 04:54 PM
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If the O2 sensor is bad it will typically throw a CEL, do you currently have one? I assume not or they would have failed you on the spot.

If the cat is failing that will of course have an impact, but with as close to the acceptable # as you are and the fact that your not noticing any funny smells (rotten egg smell), leads me to believe it is OK.

Good gas and a thorough flogging and also having the car good and hot when they test will help you...

While your at it clean your TB and IACV along with the EGR, heck with a car that sat it can only help you.

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post #12 of 24 Old Jun 24th, 2005, 05:59 PM
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Quote:
Originally Posted by tmcnally
as promised...the report.

FINAL RESULT: FAIL
Inspection Performed: ASM 5015 Enhanced Emissions Test and Safety
Inspection Results: Safety: Fail OBD/Emissions: Fail

Gas.....Standard...Reading...Result
NOx.....1186........1285.......FAIL
HC.......152.........158.........FAIL
CO%....0.85.........0.46.......PASS
CO2%...X............12.9.......X
O2%.....X............1.1.........X
RPM......X............0...........X
Gas Cap...........................PASS
Tampering........................PASS
Visible Smoke....................PASS

X's indicate a blank space so I guess NJ doesn't care or check that data.
Do you guys think a tune up is enough to drop those first 2 #'s?

LEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAN!!!!

#1 thing to do: change your gas filter. Easy, cheap, might actually work, and since it's probably an original you have now, wouldn't hurt anyway.
Does your car make a whistling noise when driving? Cuz a vacuum leak is what I would suspect. Never hunted mine down, but it went away after I rebuilt the top end the first time. If you just want your car to pass, and not blow a hole in a piston while driving up to the emissions station, read up about inserting a SMALL resistor between ECU and MAF sensor. If you want your car to actually keep running after that, find the leak and/or get your injectors flow-tested and replaced/cleaned as necessary. Check fuel pressure as well, you might have some really really really bad stuff in your gas tank/lines/pump.
BTW keep it filled with 93 octane gas till you find out what's going on, and don't drive it too much.
Don't actually warm up the car before testing cuz that's how you get NoX, IIRC. Drive it up to some place near the station, let it cool for an hour, then drive up and take your chance. HC will stay there, though.

93 Sentra XE 5spd, running well... 82 924 Turbo under construction... 82 Suzuki GS650G, under construction... 76 Firebird Formula 5.7, waiting for the next summer.
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post #13 of 24 Old Jun 24th, 2005, 06:03 PM
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And disect the gas filter when you take it out. More, post a picture. I've never seen the insides of mine and really wonder what it would look like after being in the car for a few years (as in, what kind of stuff it catches ).

93 Sentra XE 5spd, running well... 82 924 Turbo under construction... 82 Suzuki GS650G, under construction... 76 Firebird Formula 5.7, waiting for the next summer.
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post #14 of 24 Old Jun 24th, 2005, 06:42 PM
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Quote:
Originally Posted by Petrovich
LEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAN!!!!

#1 thing to do: change your gas filter. Easy, cheap, might actually work, and since it's probably an original you have now, wouldn't hurt anyway.
Does your car make a whistling noise when driving? Cuz a vacuum leak is what I would suspect. Never hunted mine down, but it went away after I rebuilt the top end the first time. If you just want your car to pass, and not blow a hole in a piston while driving up to the emissions station, read up about inserting a SMALL resistor between ECU and MAF sensor. If you want your car to actually keep running after that, find the leak and/or get your injectors flow-tested and replaced/cleaned as necessary. Check fuel pressure as well, you might have some really really really bad stuff in your gas tank/lines/pump.
BTW keep it filled with 93 octane gas till you find out what's going on, and don't drive it too much.
Don't actually warm up the car before testing cuz that's how you get NoX, IIRC. Drive it up to some place near the station, let it cool for an hour, then drive up and take your chance. HC will stay there, though.

It shoudl reduce NOX as the cat needs to be good and hot to function properly. I also thought NOX was too much fuel and it not being burned off suffciciently, what make syou think it is running lean?

I agree on changing the fuel filter. Can't hurt.

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post #15 of 24 Old Jun 27th, 2005, 01:49 PM
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Quote:
Originally Posted by wes
It shoudl reduce NOX as the cat needs to be good and hot to function properly. I also thought NOX was too much fuel and it not being burned off suffciciently, what make syou think it is running lean?

I agree on changing the fuel filter. Can't hurt.
Somebody told me NoX goes down when engine is cold due to lower combustion/intake temerature - ? Might be wrong, thinking twice, you do need the cat to be hot.

Running rich would drive his NoX down, IIRC. Problem is, if he's lean, NoX should go up but HC should go down, unless he has misfiring issues...

What chould have happened is that his oxygen sensor threw in the towel, engine ran rich, and ate the cat converter, thus both HC and NoX.

How about pulling out a spark plug and posting a picture?...

93 Sentra XE 5spd, running well... 82 924 Turbo under construction... 82 Suzuki GS650G, under construction... 76 Firebird Formula 5.7, waiting for the next summer.
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