David Todd Posted September 10, 2010 Report Share Posted September 10, 2010 I've got a 1991 Subaru Legacy with an EJ-22 Turbo swap (motor is the entire closed deck variant) no mods, stock injectors.. I'm running the throttle body at 18% open with cyclical idle keeping the revs around 1800; I've tried playing around with the settings some, I've got it setup to where it's pretty rough. Every now and then I'll get a muffled pop sound back through the intake, it's loudest at the filter. I'm not exactly sure what's going on, but it sounds like a lean idle pop. I know that at that point on the fuel map (around where the engine is idling on cyclical idle) I'm seeing AFR's of 13.5. Unfortunately I can't check the AFRs while on cyclical idle since the sensor just reads far lean. I've never seen any flames, nor is it a loud bang; it sounds like it's happening in the runners. At cyclical idle I'm seeing -10kPa to 2kPa manifold gauge pressures, and the entire car smells rich; which isn't really new to my car. I just want to make sure what's going on isn't a serious problem? Maybe it's too much ignition advance? (about 23 degrees) or I need to change the injector timing? (375 degrees) Also, on cyclical idle, is it a fuel cut? ignition cut? both? Quote Link to comment Share on other sites More sharing options...
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