koniu77

can a bad O2 sensor cause my car to run real rich and make it die at idle?

NoGo

iTrader: (2)

Yes it can.

A good tell tale of this is starting your car after it has been sitting for a day. If the car runs fine for the first minute or so, then all of sudden starts running like garbage, it is most likley a bad O2 sensor.

koniu77

i also get a flashing ses light and a misfire code

NoGo

iTrader: (2)

Oooooh.

What was the last thing that was done to the car before it started doing this?

koniu77

cam, heads, longtubes, and a 3000stall Vig verter

NoGo

iTrader: (2)

What size cam did you install?

koniu77

222/226 .566/.569

NoGo

iTrader: (2)

If the car appears to be running okay, just rich with a misfire code, then everything may be okay.

Headers (especially LT's) goof up the O2 readings and will cause the car to run rich.

The lope of the cam goofs up misfire detection of the PCM (makes the reluctor wheel speed inconsistant at low RPM) and sets off the misfire detection. Both of these problems are fixed through tuning.

This is all assuming that the car runs fine though.

If it is just your new mods, you should be able to get on the gas and the car should run fine when around 2500 rpm. If the car is still breaking up and misfiring at this high of an RPM, then you have other problems.

koniu77

besides idle problem the car runs fine.

ill probly tune my car by the end of this week, is there anyway i could manually increase my idle to about 900rpms so that i could drive the car for couple days?

NoGo

iTrader: (2)

You can invert the screw on the stop on your throttle blade stop and use that to adjust how far open the plate will open up. This will increase you idle.