???? for you engine experts

[chrisilversvt]

i have a couple ???'s that i know some of you guys can help me with...

first of all am i correct in the assumption that o2 sensors don't really do anything until they are heated???

would bad o2's cause my car to run bad even when first started,or would it take it until they got heated up,before it would affect anything???

i have a problem that just started after i changed the o2's....but it is present upon initial start up....and the driveability is terrible...

my brother is going to check the fuel pressure and some other things this weekend,but was just curious about the o2's....

i already checked the vacuum lines and plug wires,any other ideas would help....thanx in advance....

 

[Joes95GT]

I wouldn't say that the oxygen sensors don't do anything until heated up. They give (to an extent) false readings when they are not up to temperature, but I wouldn't say that they don't do anything.

Joe