I failed passing the NOX test what is the best quick fix or what can i tamper to pass

 

how could anyone possibly give you good advice when we don't even know what you drive?

ODB

 

oldmobile 83 model delta 88
5.0L

 

You can either run rich or very lean to reduce your NOx output. However, your HC and CO output will be impacted accordingly. Probably best to have the EGR system fixed.

 

Running EGR at idle and light load part throttle will reduce the NOX.
If if was me I would run very lean with a bit less spark advance to pass the test.
You can get away with leaner mixtures by doing several things.
1. run your car hotter.
2. run very tight plug gaps & new plugs.
3. run warmer air into your carb/throttle body, AND increase your EGR.
4. get rid of the PCV
5. increase your exhaust backpressure

there are other ways, but that is more than enough.

good luck
ODB

 

I had the same problem last summer. What I hadn't realized was that i had stored codes. So check to see if you have any codes stored on the chip. Most codes have to do with the emissions (at least in camaros). All I ended up doing was replacing an in-line fuse for about 25 cents, and i passed inspection. (The EGR soleniod was not getting power.)

Joe



------------------
86 IROC TPI 305
700-R4
K&N Air filters
Next mod = trans-go shift kit (level 1)