Thread: Maryland Emissions

Quick update -- I tested with a Nissan OEM cat (or what I think is an Nissan OEM cat) rather than my Random Tech cat. The results were actually worse -- HCs went up 1.7 (from 1.4, standard is 1.1) and NOX went up to 2.1 from 1.8 (standard is 2.0).

Thanks for checking in.

UPDATE

My long automotive nightmare has ended. I passed the MD emissions test on my 10th attempt. I want to thank DC Scotty for originally suggesting that I try air injection.

After testing a couple of other things, like Calum's VE tune instead of JWT's and richening up my light throttle mixtures, I finally tested with the IAV installed and working. Here are the setup details:

- Back to original JWT tune from my first test.
- AIV from 1991 SE-R retrofitted to VE using an early HS header that I had in the basement.
- Installed my old copper plugs NGK BKR6E-N gapped at 0.034" and took out the Iridium plugs.
- Timing set at 12* BTDC (normally at 15*)

I connected the AIV vacuum tube (which originally comes from a solenoid and allows the ECU to activate the AIV under certain conditions) directly to a fitting on the intake manifold on the engine side of the throttle body. So the AIV was activated all the time. This did not cause drivability problems or backfires. However, I did not run the car this way for extended periods of time -- just for testing. The lower hose from the AIV was attached to the brass tubing from the header, and I routed the top AIV hose through the little black noise reduction box and then over by the battery where I secured it with a cable tie and affixed a little filter to it. The AIV itself was attached to the head near it's normal position by a single brave bolt.

Here are the results of the emissions test:

..................State Limit..........W/O AIV.............With AIV
HC..................1.0....................1.6.... ................0.8
CO................20.0..................16.8...... .............11.9
NOX................2.2...................1.8...... ...............1.2

I test again in 14 months, but now I have a better idea of how to pass.

Thanks to everyone who tried to help.

Billc

Man this is funny, Scotty and I were just going over your imissions nightmare yesterday trying to come up with some new ideas and you already passed I'm glad to see you finally made it. Hey can you post a pic of what you did with the AIV???

Thanks for keeping me in mind.

I took a picture before I restored the car to "original" (Fuji header) and will be pleased to post it up after I get my daughter to return the cable I use to connect the camera to the computer.

Bill