it seems to be that, sometimes when i let my foot of accelerator, i get a hiss, (pressure is released) other times, it doesnt release or releases to early, would this be my diverter valve
opened bonnet and switched off car, the n75 valve continues making a low noise, so changed over egr valve with n75. the n75 in new position still makes noise when engine turned off. would this be the n75 knackered
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