Bad O2 sensor? 
Bad O2 sensor?
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.
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.
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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.
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.
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Thread Starter
Staging Lane
Joined: Apr 2004
Posts: 98
Likes: 0
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?
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?