Firstfives.org

As promised, I ordered and installed a Bosch four wire, heated 02 Sensor. Then I calibrated my Heathkit Air Fuel Mixture monitor. Here are the AFM results from cold start by minute, first at Idle, then at Higher RPMs, then back to Idle. Overall, I could not quite believe how much more stable the eng...

Given my experience with this engine I decided my first tuning adjustment would be to raise the fuel pressure. I hoped that AFM measurements would confirm prior guesses based on feel that this was correct. I also I hoped this might alleviate surging at idle or low throttle and reduce risk of excessi...

Here is an old post of mine from the e9 site on fuel pressure adjustments I had made previously. I think maybe I should go back to 2.8 bar and see how it affects my Closed Loop Idle issue. I also have an O2 sensor with heater on order… Lean L Jet 3.5 Liter & Adjustable Fuel Pressure Regulator My...

I am hoping to get some L Jetronic insight and also provide some information that may help others tuning theirs. Two issues for discussion: 1). In Closed Loop Mode (Oxygen Sensor connected) as my engine warms from Cold Start idle speed grows from 550 RPM to 800 RPM as the sensor becomes active. With...