Hey Guys,
I have done a few searches on O2 problems with OBD0 b16 swaps but I'm looking for some insight.

My car has failed Emmissions testing in Ontario twice this week, it does not burn any oil whatsoever. The car's numbers were rediculously high, meaning the car is running really rich. I read up on lots of dual-o2 problems (people wiring the o2's backwards leading to the engine running like crap) but I have checked everything out and it looks like they're wired properly. When the O2's are hooked up the engine has a bit of a bog, the powerband is not smooth and it feels like it's always struggling.

I disconnected both o2's and drove it last night and it's like night and day. The car's obviously running rich but it's running a lot better. So right now I'm thinking one/both of the o2's are disfunctional, but how do I test them to figure out if they're working properly or not?

My birthday is on Tuesday, if my car doesn't past e-test by then I am goign to have some major problems... Does anybody have any insight into my situation? How/where should I check first?

Thanks!

 

Here's what my numbers looked like

High speed test -
Limit Result

HC 78 133
CO% .44 .90
NO 907 3161


Idle

HC 200 406
CO 1.00 0.8
NO N/A N/A

 

no worries. If you don't pass, just go to MTO and get a pass for $10 and you'll have about a month (not sure exactly) to fix your car. Make sure you don't screw up fo the third time coz you'll have to dish out about 4-500 $$$ to have it on the road.
So;
a. Make sure your O2 sensors are wired properly (check FAQ) and ones you have it done right, reset your ECU! you have to erase long term memory. Just kill the battery for 10sec. with O2 sensors, I dump mine for new ones every 50K. They become lazy with time.
b. Is your cat ok? You sure?
c. If the power is not smooth, check distributor problems. i.e. with wires, make sure that when you bend them, the impediance does not pass I think 10K ohms....the cap.

Careful with the e testing. Make sure the fan is blowing on your rad and you're getting some flow on your cat as if it gets too hot for the cat, it won't work and #s get really high. That's how I got fucked once...
HTH

 

NOx that high means one of 2 things:

running lean
overadvanced ignition timing

one of those problems killed your cat.

guaranteed you need a new cat.

i have a pr3 ecu, with one o2 bung on the header. For my emissions test I split one o2 sensor into both o2 sensor inputs at the ecu. With a good cat, it will pass.

 

I'm almost positive the o2's are wired correctly as I checked this morning and asked the engine installer which is really reputable in the area.

I am getting a certificate so I can run Hot Rod this week but assuming my numbers don't improve I will not even pass Hot Rod. My car run at the higher numbers 2 years ago but this year it has been a total pain in the ***.

I'm going in for a rip-off diagnostic test tomorrow morning at 830am, *HOPEFULLY* they figure out what's wrong. My old ZC blew oil like HELL, so I'm thinking maybe the Cat is coated in oil and is just screwed because of it. It is only two years (100k or so) old, but with so much oil going through it who knows. I can smell the exhaust when I push the car, smells like ****.

Hopefully with the o2's tested and a pre-cat test done they will be able to determine what my problem is. Sick of screwing around with this stupid car right now.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drussell4801 &raquo;</TD></TR><TR><TD CLASS="quote">NOx that high means one of 2 things:

running lean
overadvanced ignition timing

one of those problems killed your cat.

guaranteed you need a new cat.

i have a pr3 ecu, with one o2 bung on the header. For my emissions test I split one o2 sensor into both o2 sensor inputs at the ecu. With a good cat, it will pass.</TD></TR></TABLE>

My ZC did run really lean before it blew. The plugs were chalky white when I pulled the motor. I believe the ECU went for a **** or it was tuned really improperly (chipped ecu before I bought it). I was inititally thinking Cat, but doesn't it seem weird that the car seems to run a hell of a lot better with the o2's disconnected?

 

yeah, with o2's disconnected, it runs rich at all times. It's stuck in open loop.

I still say new cat = problem solved.

Seriously, dont' put too much thought into this one.

 

So my cat was changed, and my numbers looked something like this...

High speed test -
Limit Result

HC 78 54
CO% .44 .01
NO 907 2156

Idle

HC 200 154
CO 1.00 0.02
NO N/A N/A

Any ideas why my NOx is still so high? I am assuming the car is running really lean. I checked the timing and it's bang on. There seems to be good fuel pressure, but the car has no jump at all. Always feels like it's lagging and (by the numbers) starving for gas.

Where else should I start looking? Could it be the o2's or are they unrelated?

Thanks!!