Where do I start?

Within the past few days I've had a problem with my car. Throughout all rpm's it hesitates to go, sometimes when I give it gas it just bogs down and doesnt really go at all, almost like it's coughing. Then I let off, and the rpm's drop to about 500, but it never dies. So after driving like this only getting worse the SES light finally came on.

So I rolled down the street to a local Advanced Auto and had someone scan it for me. I saw on the scanner code # P0174 'Lean Bank 2'. He tried to tell me the car was running that way "...it's because you got that k&n in there man, and all those other tweaks you've done." I laughed and said yeah, ok and left to take matters into my own hands.

I got home and looked at the o2 sensors to see if they were melted or messed up in any way but they werent. So I ended up switching them to see if another code would pop up for the other bank. I tried driving it again and the same thing happened but no SES light. I installed long tubes months ago and had the rear 02's deleted by Chuck @ HPE. I even got the heated corvette o2's and it's ran fine eversince. Just the past two days it's been running like ****.

Anyway, I looked over the engine bay for a few minutes for vacuum leaks and double checked that the injectors were all plugged in, even though I haven't messed with any of that stuff. But now I'm lost and don't know what to do. My next move is to check fuel psi on the rail, maybe my fuel pump is going out? Anyone have ideas on how to diagnose?

Thanks in advance

 

bump!

 

you might have a bad batch of gas, what octane are you running? i would suggest doing a fuel test to determine if you have a bad tank of gas.

 

running 89. how do i conduct a fuel test?

 

first off you should be running 93 octane that is what is recommend for our cars(ls1's) you'll most likely have to take it to a dealership and ask them to test the mixture of your fuel. im a tech for SATURN and we have a GM supplied test kit that we use to test fuel mixtures to determine if someone has a bad batch of fuel in their tank. just last week a customer brought in a VUE 3.5L and had 2 codes( lean bank 1, and bank 2) so i tested the fuel mixture and it turned out that they had put E85 in it when it suppose to be ran with 87 octane

 

so theoretically, after this tank runs out and i fill it up with 93, the problem should dissipate? should I seafoam the car as well? fuel injector cleaner?

 

technically speaking, yes and after this tank i would recommend a fuel additive treatment. i recommend the gm fuel treatment you can buy at the dealer the bottle is around $20 though. let me know what happens after you burn up this tank and run a fresh 93 and injector cleaner.

 

will do..thanks for your help 99huggerorangeZ