Its normal in econ mode. The car goes into a fake atkins cycle in econ mode and loads the engine to 85% before it "upshifts". The atkins cycle leaves the intake valves open part of the compression cycle, so it feels like you got a vacuum leak, but its a mode efficient mode by reducing pumping losses
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Enginer 4 kilowatt PHEV, 3000k 35 watt fogs, Eco bulb highs, 4300k 35 watt low all w/relay kits, DRLs/Rear Wiper removed&rear interior gutted, Sony HU W/front speakers, Tanabe nf springs, 35% tint all around, all LED lamp replacement, 09 fit progress rear sway bar, OEM block heater, full gril block, KN Filter, Honda vent visiors, group 51 battery, home made balancer/grid charger Best/Worse MPG 96/36
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