Soo the Balt is running bad, wideband is showing full rich at idle but the code is for too lean at idle, car is misfiring and sluggish. I've ruled out the MAF, boost leaks, and the TMAP. The only thing I can think of is the front O2 sensor, any thoughts?

Codes are P2177 P0300 P0301,2,3,4 nothing else. The lean on idle code is gone, I can get her to idle normally by disconnecting the from O2, with and without it the car gets choppy at higher RPMs

Compression and leak down checks are good.

***UPDATE***
So I logged the car, with the O2 sensor in at idle my fuel trims are all over like a crazy kitten on cat nip. When I unplug the forward O2 trims are all at 0, AFR goes to 13.8ish, car is still no longer choppy at higher RPMS, when I switch to my trifecta tune it drives fine but breaks up at high RPMs

 

Any codes? Cel? How long since oil change and/or seafoam?

 

How many miles on your car and did you check/replace the spark plugs?

 

O2 will throw misfire codes when it's going

 

I'm comming up on an oil change. Sparks have 2,000 mi on them at least. Does misfire, at cruise. Under WOT the car breaks up in the higher RPMs, last night it hit 27lbs.

 

Always the same cylinder misfiring?

 

If by same you mean all 4, hah yeah, everytime

 

I would unplug the purge valve an drive it around a bit.

 

On the intake manifold? I did try that and got no changes in the car, what did change was at idle I would sit full rich with a MIL for being lean, I unplugged the connector for the front O2 sensor and she settled to 13.5 AFR idle but still full rich at cruise or any load

 

may have an injector stuck or very dirty. You need to get a list of codes that its throwing. It should tell you multiple cylinde misfire or cylinder"" misfire detected. If its a single cylinder I would start with coil packs and plugs on that cylinder, try swapping the two to another cylinder as a elimination process. If its multiple cylinders there should be another code that will point you in th right direction. As far as it saying lean and dumping in fuel makes me think that one cylinder is not getting fuel. That would be about the 10th LNF that ive seen with a locked up injector.

 

The problem, my good friend, is that I am no longer there to help you. Well, that and the fact that you have strange sex with wild animals and your karma is all fucked up, but that's really nothing to worry about.

 

Dave once the Balt is running I'm going to drive out to SC to have sexual relations with your face

 

I have nothing to fear then, haha.

 

ohhhhhhhh!! Buuuurrnnnnnnn!!!!!

 

When you say the wideband is showing rich, do you mean the factory wideband or another wideband you have hooked up? If its a separate wideband then I would say your factory o2 is reading incorrect.

 

Yeah I have a AEM UEGO, the aem is showing rich while the cars o2 is showing lean

 

Also I thought at WOT the o2 sensor was taken out of the loop

 

You got the service books man? 100% sure it's the P2177 that's the issue, the rest are just symptomatic.

Looking at roughly 1 page of diag work to figure out what's causing it. You've got my number shoot me a text if you want me to walk through the procedure.

 

My vote is that the front O2 sensor is going.

This car is one of the few cars out there that is closed loop even at WOT.

By you having two widebands showing two different things, that right there shows that one of them is messed up. By disconnecting the car's front O2 wideband sensor, you're forcing it into an open loop mode, so add to that the fact that when your car goes into open loop when you disconnect the car's wideband and goes to 13.8, you found the problem. The O2 sensor is on the fritz, and reporting that you're too lean, causing the ECU to add fuel to the point that you're pig rich (being reflected on the non-car wideband).

The front O2 sensor is going out, and your car apparently should also have around a -6 fuel trim. The other issues are probably being caused by the sensor.

After you fix it, check your sparkplugs. They may be fouled from excess fuel being burnt onto them, and you may need new ones before it'll run good again (it may still misfire until you do that, due to being fouled).

 

I'm voting for a bad 1st o2 sensor as well. Why you have 2 wideband sensors is beyond me, but they seem to have helped diag this time.

 

Thanks after I talked to YelloEye last night on the phone he agreed with my thoughts on it being the sensor, I just wanted to go by the old saying of "measure twice, cut once" instead of throwing parts at it first.

well I got a good deal on the AEM, originally I was just going to use an interceptor, but I'm glad I have a wideband that isn't dependent on the system otherwise this could of been more of a pain to figure out.

-Alex