Emissions Test Success

[gbmidyear66]

I've seen a few recent posts of other ZR's enduring the pain of emmissions testing.

Where I live - older cars have to run the emmisssions gauntlet yearly. I was a little concerned how this would go - given that my 67 usually gets through by the skin of its teeth. I have a one year grace period with the ZR-1 since I recently purchased the car.

I have recently replaced the injectors (Multec look alike disc types from FIC) replaced the plugs (NGK Iridium) and loaded the stock GM PROM. Thought I better give it a try while I still have plenty of time to fix any problems. Made it through with flying clours - my readings were as follows:

Driving Test:
Hydrocarbon ppm - 7.0 (88 allowed)
Carbon Monoxide % - .02 (.66 allowed)
NOx ppm - 5.00 (979 alowed)

Idle:
Hydrocarbon ppm - 8 (75 allowed)
Carbon Monoxide % - 0 (.42 allowed)


Well tuned - these cars can actually run pretty clean.

[WB9MCW]

Congrats on the pass

[Kb7tif]

Well here is a tidbit for ya. My 1992 had ported plemum, chipped, fidanza, watson small tubes, random tech cats.
Passed tennesse emissions no problems this year.
(new owner was happy):o

[Aurora40]

Well tuned - these cars can actually run pretty clean.
The problem generally is when you have headers and bullet cats. Congrats on passing, though. But they test a '67? A car that had no emissions control devices nor emissions limits when new? How can they expect it to have controlled emissions now?

[Kb7tif]

The problem generally is when you have headers and bullet cats. Congrats on passing, though. But they test a '67? A car that had no emissions control devices nor emissions limits when new? How can they expect it to have controlled emissions now?

Yes the random tech are bullet cats after the long tubes.

[gbmidyear66]

The 67 has much higher limits. But I generally have to play with the idle adjustment and timing to squeak through, then readjust everything again so it runs decent.

I now have it plated as a collector car - so I will be exempt in the future.