Quote:
Originally Posted by Austin8214
I have both of these codes on a 2000 Silverado with a 4.8 engine. I am looking for some advice. I already have preformed the entire fuel pressure check that is outline in the Haynes manual and replaced the Fuel Pressure Regulator, as the pressure was low. However, the code persists after resetting it. I have heard form other sources that the O2 sensors GM used in these trucks are due for replacement after 100,000 miles. Is this true? Also what voltage reading should I be seeing at idle and at wide open throttle from the O2 sensors. I have already checked the connectors for water and corrosion and they look fine.
|
both downstream sensors are reporting a lean condition....what is the fuel pressure ????must be 53-62psi...
did you check for intake leaks....////including any leaks in the air ducting after the MAF????
since both sides of engine are creating the same lean reporting from O2 I would not expect the O2 to be bad...
the manufactures recommend these o2 sensors to be replaced at around 100,ooomi....if you do all hyway longer if its stop and go all day shorter mileage....basicly hours of engine operation will be longer with the given mileage in stop and go traffic..
since this is both sides I don't think exhaust leaks are involved...
obviously any improper crankcase venting [PCV ,hoses etc] will cause this..
as well as fuel filters and air entering the engine intake after the maf ,,,injectors dirty....etc..