
The most common response to California Smog laws among car lovers is generally one of genuine sympathy. But here are a bunch of helpful folks in online forums like Rennlist or 924board or Pelican Parts.
There were lots of strategies like:
+ “Goto a county with lower requirements” – didn’t really explore this one.
+ “Find a smog tech on the forums” – quite a few seem genuinely helpful on diagnosing issues.
+ “Get a new catalytic converter” – expensive
+ “Come to Texas!” – maybe one day
Our goal is to meet the emissions requirements alongside our desire to remove all the carbon from this campaign or perhaps even the rather colorful life of the 924s (based on an estimate LCA).
We wound of settling on a strategy which involved talking with a few smog test businesses to determine who would retest for free or at a discount if failed first time around. Because the hard part was just getting baseline data.
Then went ahead and worked through the most common referenced items to save time and money and left open the option to get numbers and troubleshoot from there.
What is perhaps most interesting is that LLMs are trained on data from the forums, among other places. So below was the guidance from Claude.ai along with which pieces we did vs deferred.
TLDR the cat was empty. There was a newish looking box, but like a vacate snail shell…nobody was home. Hmmm. WA state ended their smog program in 2020, so not a total surprise. Also for Lemons purposes this obviously a safety, or public safety, expense.
- Required Systems: yep have these
- Catalytic converter (must be original or CARB approved)
- O2 sensor
- Fuel injection system
- EGR valve and passages
- Air injection system
- Evaporative emissions system (charcoal canister) – not sure this exists on 924s, but do have one on an 1975 914…replaced charcoal pelets with fish acquarium grade pellets, but I digress
- Common Issues to Address:
- Replace air and fuel filters – did this
- Check for vacuum leaks – did this
- Verify timing is set correctly – did this
- Check spark plugs and wires – didn’t get this yet
- Ensure gas cap seals properly – did this
- Fix any exhaust leaks – did this
- Pre-Test Tips:
- Drive the car for about 15-20 minutes before the test to ensure catalytic converter is at operating temperature – yes very common advice
- Use premium fuel – 91 octane in CA. check.
- Make sure check engine light isn’t on – not sure there is one, but ok
- Get an oil change if needed (dirty oil can affect readings) – didn’t get to this as oil is about ~2k miles.
- Check coolant temperature sensor (can affect fuel mixture) – didn’t get to this
- Additional Notes:
- Visual inspection must show all emissions equipment present and connected
- Keep maintenance records as proof of proper upkeep
- Consider a pre-test at a repair shop if unsure
