DsmDanielson
Proven Member
- 104
- 0
- Jul 13, 2016
-
Peoria,
Arizona
So I’ve been searching this forum all day and nothing is quite similar to my situation. Here’s the scoop;
1. My car starts and drives fine, I have stock injectors in right now, 12 psi of boost off a small 16g, Afpr, walbro 255 (not rewired)
2. The issue is I noticed my gas mileage is a bit worse than before. About 200 miles from full to empty. 18mpg, is not okay, and I mainly drive on the highway and I don’t have a lead foot.
3. Checking my logger, I noticed my o2 sensor doesn’t cycle at idle or cruise, only briefly after I decelerate and then get back on the gas.
4. My fuel trims are 24.2% for STFT and 15.8% LTFT when in Closed loop for that brief period, and 4.7% STFT and 0% LTFT in open loop. That means I’m running lean, why am I losing mpg then?
5. I unplugged my MAF and my idle just surged momentarily and then it went back to normal. I thought my car was supposed to die?
6. I unplugged my brand new o2 sensor and nothing happened at all. But I did get a heater circuit cel after a minute or so. I’m so lost.
Pointers: Can it be my ecu? My tps shows 0.8 and 98% on the logger respectively, I hear a clicking once in while from within my dash, my fuel pressure is set for 43.5 base pressure, and I don’t have any significant leaks, not to cause a lean condition like that.
If I’m running lean, why is my gas mileage plummeting anyway? I posted a log after driving home from by buddies house (freeway driving) and then AFTER letting the car idle for a few minutes, I screenshotted the results.
1. My car starts and drives fine, I have stock injectors in right now, 12 psi of boost off a small 16g, Afpr, walbro 255 (not rewired)
2. The issue is I noticed my gas mileage is a bit worse than before. About 200 miles from full to empty. 18mpg, is not okay, and I mainly drive on the highway and I don’t have a lead foot.
3. Checking my logger, I noticed my o2 sensor doesn’t cycle at idle or cruise, only briefly after I decelerate and then get back on the gas.
4. My fuel trims are 24.2% for STFT and 15.8% LTFT when in Closed loop for that brief period, and 4.7% STFT and 0% LTFT in open loop. That means I’m running lean, why am I losing mpg then?
5. I unplugged my MAF and my idle just surged momentarily and then it went back to normal. I thought my car was supposed to die?
6. I unplugged my brand new o2 sensor and nothing happened at all. But I did get a heater circuit cel after a minute or so. I’m so lost.
Pointers: Can it be my ecu? My tps shows 0.8 and 98% on the logger respectively, I hear a clicking once in while from within my dash, my fuel pressure is set for 43.5 base pressure, and I don’t have any significant leaks, not to cause a lean condition like that.
If I’m running lean, why is my gas mileage plummeting anyway? I posted a log after driving home from by buddies house (freeway driving) and then AFTER letting the car idle for a few minutes, I screenshotted the results.
