Failed Emissions Help
 

I recently acquired a 1974 914 2.0 and just failed emissions. Idle HC's were 439 and the allowed max is 400. I feel like I'm close. Any help on adjusting the fuel mixture leaner would be much appreciated. I believe it's as simple as counting "clicks" on an adjustment screw in the lean direction, but I don't know where that magical screw is located or which direction is lean and which rich. Thanks!

Idle HC is adjusted with the knob on top of the ECU. I believe that left is lean, and right is rich.

Make sure your ignition system is in tip-top shape as well. I had ignition points that were not in great shape and it really threw my emissions out of whack!

--DD

Additionally, add a few pints of straight ethanol to your gas before you go to emissions. No more then 2 pints.

What state/jurisdiction tests a 1974 914 for emissions? I thought they were exempt everywhere by now.

Thanks for the pointers, fellas! Good to have this information. After a bit more research into testing regulations, I found an exemption for classic cars, but it required me to drop the 914 from my conventional insurance and get “classic car insurance” which I got at Haggerty. Appreciate the comments. BTW, jurisdiction was Tucson, AZ. For no restrictions, cars have to be 1966 or earlier to have a full emissions exemption. Rural registrants also have exemptions.

maybe a leaking pressure sensor

To adjust the fuel mixture on your 1974 914 2.0, you’ll want to locate the fuel mixture adjustment screw, which is typically found on the fuel injection unit

@FrostyCVW9
Welcome to the bird board from a fellow Arizonian. I am north of Phoenix.

I have had an oil change bring my HC down