bamfer9duce

iTrader: (3)

I picked up a 1998 6 speed Z28 a few weeks ago. This thing is the true meaning of bone stock. Factory lid with factory exhaust.

The car gives me all four low voltage oxygen sensor codes. 0131 0151 0137 0157 If I clear them they come back on in a minute with some sprited driving. The car does seem to have a slight miss down low.

Notes-

Car did sit for a while but that tank of gas has been burned through and filled up all the way with fresh 93 octane.

I replaced the bank 1 sensor 1 with the O2 sensor off my other LS1 car which is known to be a good sensor.

I cleaned the throttle body and its sensors and cleaned the maf with cleaner.

Sometimes only the codes for the front O2's come on

I replaced the fuel filter and check the fuel pressure and it was proper PSI.

Basically I would like to know two things? Could this be caused by clogged/dirty fuel injectors? Could this be caused by older plugs and wires? All four couldn't have possibly gone bad right, I did put a known good sensor in there. Anything else I should look at?

sreve

iTrader: (3)

vacuum & exhaust leaks

Quote:
All four couldn't have possibly gone bad right?

it running lean sounds much more likely, check the trims

nitroracer

iTrader: (4)

My 98' Z28 gave me these codes this morning, some were only pending. But if all four oxygen sensors are showing low voltage is there a part of the wiring harness I should be checking for a short?

Yuik87

check fuses