doabarrelroll

My exhaust was hot to the touch. I just sent you an email too.

Rogue_Ant

Yep, got it, and sent one back to you.

doabarrelroll

So, at initial start up I'm at 16:1, then after it warms up it drops to about 13.5:1.

I think I may need to do a CO adjustment on the AFM and/or try a different AFM.

Josh has been a champ of customer service here.

doabarrelroll

Strange, now after adjusting the AFM, I get 16:1 at idle at FQS position 2. However, if I disconnect the O2 sensor, and return the FQS to position 0, I get stoich.

I don't think I can pass smog with my 02 disconnected.

Rogue_Ant

What happens if you leave the FQS in position 0, and connect the O2 sensor?

doabarrelroll

AFR drops back to 13:1. I think I'm going to attempt smog with it disconnected.

Rogue_Ant

That doesn't make sense... The O2 sensor should correct the AFRs to bring it to stoich (~14.7), not pull it away.

Have you checked for leaks in your exhaust (which could effect either the NBO2 or WBO2)?

You said the NBO2 was new, but have you checked it for proper operation:

http://www.clarks-garage.com/shop-ma...-19.htm#oxygen


Is the NBO2 a universal (wire-in) unit? If so, did you solder it or use butt-connectors?

doabarrelroll

I checked for leaks in and around the NBO2 sensor. I have a v-band clamp about 8 inches from it which was my initial thought for a leak. The NBO2 is new and is the 13012 specific Bosch, not universal.

I'll have to test the sensor itself too.

doabarrelroll

Ok, so after checking all pipes for leaks, none. I then checked my bellhousing grounds, fuuuuuuuuuuu.

Anyways, they were loose and the DME ground was swapped for the other one.

Needless to say, I'm trying for smog tomorrow. Fingers crossed!

doabarrelroll

SO CLOSE!!!

15 MPH
HC: Max 83, Read 130
CO: Max 0.53, Read 0.52
NO: Max 663, Read 995
Fail

25 MPH
HC: Max 65, Read 65
CO: Max 0.63, Read 0.29
NO: Max 738, Read 680
Pass

It seems my NO numbers have gone WAY up since the last test. Since it has leaned out substantially, I'm wondering if that would contribute that substantially.

I'm using a "performance cat" from SFR too. Maybe too free flowing?

Rogue_Ant

HC is high, and NO... How long did you run the car before the test?
If you can touch the exhaust, it isn't hot enough. You should be running the car for min of 30 minutes before the test.

Did you check the O2 sensor?

doabarrelroll

Yea, I checked the O2 sensor. It's maintaining stoich no problem and the voltage is good. I think I only ran the car for 15-20 minutes at the most before the test. I also shut it off for a good 10 minutes when I got to the test facility.

I'll probably run some of that guaranteed to pass snake oil and then run it for at least 30 minutes. I wonder, if a super hot cat is the solution.

Maybe I should pull a little fuel too? My CO was 14.0 at 15 mph and 14.4 at 25 mph.

Rogue_Ant

Pulling fuel will increase your NOx...

That is why I asked about how long you warmed it up for. You are too high on HC (meaning un-burnt fuel), and too high on HC (meaning too high of combustion temps). When both of those are high, usually it means that the cat isn't doing its job, and typically that is because it wasn't hot enough.

Run the car for a longer time (preferably driving, not idling), then try to get right-in once you are at the testing station. Do not shut off the car before testing.

You could try to pull a little bit of fuel and reduce timing. That might help both HC and NOx. The O2 sensor might be pulling the AFRs to stoich. But as they age their response is slowed... At this point, I would invest the $60 for a new one, then there isn't any doubt about its condition.

doabarrelroll

Great news! She passed!

Just barely mind you, but, works for me! I warmed up the car for over 30 minutes, at various RPMs.

I also ran through a bottle of the Techron fuel injection cleaner.