bermo Posted June 13, 2018 Share Posted June 13, 2018 Motor is built, bunch of stuff has changed and I'm in the middle of tune with Dave. AFR's are fine at idle, under low load and vacuum they are fine, when I'm transitioning from vacuum to positive pressure (say around 0 or 1psi) the AFR's go lean to 15.5 or 16. I can feel the hesitation. Imagine cruising the freeway in 4th or 5th gear and you ease into it, boost starts to build and then the AFR's go to 15.5 or 16. You can get through it by pressing the gas a little bit more. Things I've done: • Pulled fuel pump and put in new a o-ring, made sure the pump 'set' into place. • Installed a fuel pressure gauge and monitored fuel pressure while this was happening. Pressure is steady. • Boost leak check. • Starter fluid boost leak check. • Changed out MAF sensors, reset ECU. Maybe there are some parameters to log to get an idea if something is haywire? Any thoughts appreciated. Link to comment Share on other sites More sharing options...
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