CIS Warm-Up Regulator Tuning | Porsche911 Air-Fuel Mixture Adjustment Guide

We just finished re-building this engine and have many videos. After the initial run, we set the timing and the air-fuel mixture based on the pressure from the warm-up regulator. We did not like the surge the engine had, so we revisited the warm-up regulator. The cold pressure was too low, and the warm pressure was too high. So off came the warm-up reg, and we reset the values. With correct control pressure, the mixture had to be reset. 🚗 Porsche CIS Warm-Up Regulator Tuning & Air-Fuel Mixture Adjustment We just finished rebuilding this Porsche 911 engine and made multiple tuning adjustments. After the initial run, we set the ignition timing and adjusted the air-fuel mixture based on the CIS warm-up regulator pressure. However, we noticed an engine surge, leading us to revisit and fine-tune the warm-up regulator. 🔧 In this video, you’ll learn: ✔ How to adjust the CIS warm-up regulator for optimal fuel mixture ✔ Common issues with Porsche air-cooled engines and how to fix them ✔ Step-by-step engine tuning & restoration tips ⚡ Why is this important? If your CIS fuel injection system isn't tuned correctly, it can cause rough idling, poor fuel efficiency, or hesitation during acceleration. Follow along as we show how to correct the control pressure and reset the air-fuel mixture for a smooth-running engine. 📢 Got a Porsche or classic car? Let us know in the comments if you have tuning questions! 🔔 Subscribe for more Porsche engine restoration & tuning guides