General Running TOO lean at idle

[dSmgs-T]

Heres the scoop, my car was running awesome on the way to the tri state meet up. Then it gradually started to run leaner and leaner (16-17.9) but at WOT it runs perfect. It wasn't overheating or anything like that. Also my o2 sensor is not oscillating correctly so that could have a part in the problem.

I was thinking vacuum leak etc. not too sure though, thought I would get some input from some of you guys first to get some ideas.

thanks in advance!

 

[talon187]

###### the 02 fix the things that are wrong with it first

 

[dSmgs-T]

well i dont know if the o2 might have anything to do with the problem..

 

[dSmgs-T]

any ideas?!

 

[talon187]

yes fix the 02 that controls your fuel at ide and low throttle fix it then look for other answers

 

[spyderturbo007]

Are we talking about a WBO2 or a narrowband? When O2 sensors die, the report a lower than normal voltage to the ECU which results in a rich, not lean condition.

 

[Black_Bullet]

Check your battery voltage...I recall when my batt and Altenator was goin bad the car leaned out in the low rpms...

If o2 was bad youd run richer, vacuum or boost leaks also would make you run richer... Exhaust leaks could report a false lean condition to your wb02.

 

[dSmgs-T]

it is an AEM wbo2, and i believe i found the culprit. i broke 2 exhaust manifold studs off while putting on the new setup. i didnt think it would be that big of a deal, but just recently the car makes this disgusting noise (exhaust leak) kind of resembles a "cut out" exhaust. and has for my o2 sensor, i will be replacing it shortly, i also thought it would run rich without one, not lean.

 

[spyderturbo007]

That would be the problem. I wouldn't replace the O2 sensor yet, since it's likely that the exhaust leak is causing the oscillation problems. You aren't actually running lean because of the leak, it just looks that way beause the system is sucking in a bunch of air pre-WBO2. I would fix the leaks first and see what happens to the front O2.