when the O2's bad that means there will be too much air right?

so wouldnt the car run better at high rpms?


and can an O2 cause a backfire?

 

bad O2 sensor can cause either a rich or lean condition, depending on what went wrong. Both can cause a backfire though. Typically the sensor gets fouled out or covered over with gunk, and it doesn't detect enough oxygen, so it tries to pull fuel to get to the right mixture, resulting in a lean condition.

 

The O2 sensor doesn't affect the flow of air in any way. Only the throttle blades affect the flow of air. The O2 sensor measures the ratio of air to fuel (A/F) by looking at the oxygen content in the exhaust gasses. The PCM uses feedback from the O2 sensor to adjust A/F raito. It controls the A/F ratio by adjusting the fuel flow, not the air flow.

 

so the car will see less air due to the O2 being corroded or whatever may happen correct, and it will add less fuel causing it to run lean correct?

 

and another thing would an O2 sensor be considered an Ignition problem?

 

The actual air flow through the engine will not change. If the O2 sensors are "contaminated" they will not put out the correct voltage signal. That means if the faulty sensors are putting out a voltage below 450mV, the PCM will interpret that as "lean" and start to add fuel the engine probably doesn't need... it will, as a result, run rich.

If for some reason the faulty O2 sensor was putting out a voltage above 450mV, the PCM would interpret that as "rich" and start to pull out fuel, causing it to run leaner.

But.... that's in closed loop.... part throttle, part load. When you go WOT, how the PCM uses the long term fuel corrections is determined by whether the PCM was adding fuel or subtracting fuel in the high load/high rpm cells. If it was adding fuel in closed loop because of a "false lean" and running rich, it would continue to add that fuel in power enrichment mode (WOT) and run even richer than it is already programmed for. If the high load/high rpm cells were cutting fuel due to a "false rich" and it was running lean, the PCM would ignore the long term fuel corrections and use the "standard" calculations, and it would end up running exactly as rich as its programmed to be.

What are you trying to accomplish?

 

No.... the O2 sensors are used only to control fuel. They have nothing to do with ignition.

 

yet another thing, my book of infinate knowledge does not have the replacement instructions for the O2 sensors, are they called somethign else?

there isnt anything under oxegen or sensors... ive got the Haynes book of repairs for camaro&firebird 1993-2000

and can anyone tell me where they are?

and possibly the part number?

 

lol that was in english?

im just trying to decide or troublshoot to determin if the problem w/ my car is opti or O2 sensors...

at first the problem was only after warm, but its slowly getting to be minutes after its turned on.
and my friend (toyota mechanic) i described the situation best i could and he immediatly said it was ignition, and i told him that "the problem was only after warm" and he backed off the ignition idea

he told me to test the car under power breaking see if the problems were still there, i have yet to do it, i cant really hold down the engine... but what will this tell me?

 

What brand 02's are you running , my guess would be your running Bocsh. Get AC Delcos and the problem will go away. Who did your computer programming. The Bosch 02 sensors have a hard time reading our GM computers speically ones that are modified like mine. You need Ac delco 02's that will fix the problem.

BTW the same thing happen to my car, just started running rich, its b/c the 02' suck, they only had like 5,000 miles on them too.

 

i donno i assume they are bosch cause thats what the sparks were, i just bought the car about 2 months ago and just trying to get it running like new again.

whats the ac delco price & part number?

do i just need to replace one or both?

 

THE AC DELCO 02's DID NOT HELP MY CAR ANY.
IT STILL RUNS EXACTLY like you say your car is running.

I AM also wondering what the H3LL is wrong with my car also

Mine also runs fine when I first start it up when its cold then gradually gets worst.
IF you hold the RPM at 1500 it backfires and spits alittle, its also running rich. I am thinking about getting it hooked up on a Scanner if you find out what is wrong with yours let me know

FRED can you help

 

im pretty sure its opti but i dont have the cash for it, i just wish i knew what are obvious symptoms of either

 

Can any one help us I am going to go see if I can go get my car hooked up on a Scanner today and see what the H3LL is going on. This makes me so mad.
Can anyone help.

 

that about sums it up except for the engine not turning over

hope i get it to last long enough