I was doing an oil change today and while I was letting the new oil run through for a little bit I heard this kind of tapping. Could it be the a lifter tick or something more serious OR nothing at all?
I haven't noticed any performance loss HOWEVER I SHOULD NOTE I have a vaccum leak to the EGR...
I have gotten theses Codes from Autozone any suggestion for quick fixes to see if any will go away
p0174(System too lean cylinders 2-3)
p0401(Exhaust gas Re circulation (egr) Flow insufficient)
p0335(Crankshaft podtion Sensor(ckp)
p0340 (Crankshaft podtion Sensor) cmp