Recently serviced the Supercharger, replaced water pump and Thermostat housing, replaced the timing chain tensioner as preventative maintenance, changed oil and idler pulley. Found oil leak at crank sensor, new o ring. Got it all put back together and heard what I thought was the "Death Rattle", also p1242 code. Very little flux in idle. steady 900 rpm. Took it back apart, put it back together, new OEM tensioner. Rattle was still there. p1237 code. playing around I pulled the PCV valve and rattle stopped(Big sigh of relief!). Hate to just through more parts at it, but I did order a new PCV valve. Thinking there is a leak causing the rattle though. Any good ideas? I really hope to be on the other side of these posts one day! Thanks All.