YES! at least not on a honda. mine dropped from 23psi at warm idle on my 410 to the wheels integra down to 18psi. i shut it off and towed it home. without a knock the cranck was scared. I came on this page becuase i just bought a evo and installed all my safe guard gauges and was curiuos what evo's ran at idle. If i cranked my car and it wamed up and dropped to 5 psi............... id be very worried.