Craig13
Proven Member
- 75
- 27
- Mar 25, 2020
-
Surprise,
Arizona
I recently got my car running after a full engine rebuild. AEM AFR gauge will read 14.5-15.5 ish on initial start up but the car will begin to raise idle speed to around 2k on its own after a few seconds. When this happens the AFR gauge pegs out and reads three flat bars (over 19:1). I can sometimes get the idle to come down by blipping the throttle a bit but it will only come down to around 1k - 1100 RPM. It will also occasionally surge up and down. I have boost leak tested the entire system and fixed all leaks I found and the problem persists. I also have the BISS turned all the way in currently in an effort to control the super high idle but 1k is lowest it will go. I know it typically should be somewhere around 2 full turns out. I have also had a friend connect his AutoEngenuity (ECU reading program) to it and he said that all sensors are reading correctly and fuel trim seems right. I am at a loss at this point and don't know where else to look. Everything seems to be pointing to a vacuum leak somewhere in the system but I cannot find any leaks. Also, it is on a stock ECU. Any help is greatly appreciated!!!!!!!!!