that would put me out a car tho, and its my DD... shitty tittys... lol... but.. i do like the sound of the idea... only problem is, like i said before i read this post, ive had these mods since jan of 2011... never threw these codes until just recently.. like 2 weeks ago... and friggin gas is gettin guzzled horrrribly lol.. i really am curious why this is happening all of a sudden? .... im not familiar with this, but maybe a fuel injector not firing correctly? or could the Bank 1 O2 sensor be causing the lean fuel?....

just workin for the possibilities...

 

it could be the O2, hard to say. it would be key to find out your AFR (air to fuel ratio) when its doing this. Do you have a local dyno shop? or a friend with a PLX Scangauge or Aeroforce scanguage for these cars? The cable is about 6ft long with those scanners and they will read all the stuff you need to know. If you have any friends with modded cobalt or even modded 4 bangers might have this in their car. The Dyno shop will tell you AFR.

 

ok... how accurate of a diagnosis you think i could get based on the AFR readings? ill find someone local with an AFR, matter of fact i know a shop to go to, but if you think thatll give me a better definition of a problem ill get that checked out asap....

 

You should be able to get freeze frame data from a scan tool at autozone.

 

yea i hit that step bro, they only gave me the codes i posted before, unless you're talking bout something else?

 

Your MAF could have failed. That would make your car run in open loop and would explain why your fuel mileage has been shitty. I know when mine runs like its got a vacuum leak when its in open loop sometimes.

I just had mine fail and it ran TERRIBLY. I mean it ran like I had taken my intake manifold off and tried to start the car. If that's the case though, you can find anyone with ANY cobalt and swap MAF sensors to see if the car runs better. If it does, voila, you need a new MAF....if not, the search continues

 

Well the AFR reading is mostly just gonna tell you if running really lean or rich, knowing that will help diagnose where to start looking for bad parts. But as others are saying it very well could be your MAF has failed, especially out of the blue issues. Swap testing the MAF is a great idea too. ANY Cobalt will work.

 

Agreed with the maf failing.. We all are just hoping its a cheap part and trying to help ya. No sense replacing expensive stuff first when it could be something so stupid simple and cheap that no one would even think to try it.. Ya know

 

Hell ya thats the kinda trouble shooting i was looking for!!! Lol ill give it a go... Makes sense too :-) badass ill let yall kno how it goes

 

Woudln't the issues go away once the PCM goes into closed fuel loop if the MAF is bad?

 

Ok haven had a chance to do anything to the car but i checked code.. Only code pullin up now is P0036... Im jus gonna order new O2 sensor for bank 1 and a new maf sensor and change sparkplugs.. Then see what that does...

 

Oh and when i filled the tank up the estimated miles i would get said 200!?? Apparently my PCM is all knowledgable of the malfunctions of the car now.. .

 

you catless and still running a rear O2?

if you do get a new one, make sure its AC Delco...other brands tend to throw codes, i have found.

 

Fixed that for ya

When my MAF failed, I thought it should've been fixed in open loop too. As a matter of fact it was one of the first things I tried. Now, my situation was a little different in that my VE table (open loop fueling table) was so jacked up, the car probably couldn't run on it anyway. But, if there are any vital parameters that are sensed in the MAF, and the MAF fails, it would also cause the fueling calculations to be off. I'm pretty sure IAT1 is sensed at the MAF, but I don't know if the PCM uses it to density compensate for the airmass/cyl data. Either way, just because the PCM shifted into OL, doesn't necessarily mean the car will still run.

 

negatory ghost rider... i got a gutted cat and no 2nd bank O2 installed... but i been doin that for a year, im replacing the first bank O2 sensor since ive never had a problem with the 2nd bank O2 sensor... i got a Bosch O2 sensor cuz the place i bought it from didnt have AC delco or anything similar to OEM... i bought a new MAF sensor as well, from a company for 67$... ima change the spark plugs with the Denso PK20TT thiss weekend with it all just to see what this might fix.. i spoke to a guy who said that when you run a 0036 code, its possible misfire or something with the ignition, i dont remember it was late at night an i was tired... any ways i do know that these all kinda make sense to change due to the water that i was CONSTANTLY suckin in with my dam intake... Due to when i had bought the car there was no driver inner tire well/gaurd... one was installed after i got into my fender bender back in feb... thanks to the douche bags insurance .... so yea this weekend im fixin to take the leap and get this taken care of... Oh and just an update on how the car is, its still having trouble accelerating, it feels like it was having restriction in the intake, like its having trouble breathing when i accelerate, and gas still sucks lmao... i hate paying 45-50$ every 2 days for gas!!! **** is burning me alive.. lol

 

Make sure you tell us what fixes the problem. Install them one at a time and try it after each. You never know when somone is going to run into the exact same problem and need the info/solution. Good luck though!!

 

F YOU GUY!!! ... lmfao! j/k bro i knew someone was gonna bring that up to do it each one at a time.. lol.. i was gonna get it all knocked out at once. lmao! but for the good of all others with the possible future problems ... i will do it ONE AT A TIME.. lmao! thanks i reaaaaaaally hope one of these fixes the problems...

 

im really thinkin MAF and O2 sensor... just got this itch that its gotta be one of them two.. but the spark plugs jus cuz im at 75k and im sure they haven been changed and i probly jacked em up from suckin up so much water and runnin lean so dam much...

 

I read the first part and was like what did I do haha

I was almost going to say you could take the plugs back because they're probably not your issue, but when I thought about it... new plugs couldn't hurt.

 

lmao! attention getter huh??

but yea thats what i figured too.. trust me im not tryin to replace anything i REALLY dont need to replace lol...

btw tomorrow is the day i will get this prob fixed.. HOPEFULLY

 

yea so i didn do it one by one.. i decided to do it all at once.. as i was under the car changing the oil i decided to change the O2 sensor... welll this ^ monstrosity is what popped out... yea im willing to bet that was the problem lmao!! i got to the Maf sensor and that we switched out fine.. but i did find a hole in my CAI... so Super Epoxy to the rescue!!! dum dum dum daaaahh!!! and quick fix it was!

ok then to the spark plugs... i pulled em and thy were jus covered in carbon.. all black but no corosion at the contacts.. jus really dirty.. so i dropped in the denso twin tip plats and we were in bidnis... car battery was unplugged the entire time.. i hooked that baf boy back up did the 3 pedal tap for the oil reset turn the car on... and we was cookin wit grease!!

took it on the highway and it was runnin smooth.. little smoke came out on 2nd gear pull but it stopped when i did it again on the round trip back... no CELs and idk bout the gas yet... im gonna follow up on that in a day or so... but its not fluttering at idle and its runnin like a champ! ....
round two... BRAKES!! lmao..

 

The o2 sensor on the left looks like a bosch. Do you happen to remember what brand the one you replaced was? I hope it was just the wrong sensor, because if they were supposed to be the same, that sensor HAD to be your problem. These were both the primary o2 right?

As far as the hole in your intake, was it before or after the MAF? Before the MAF isn't that big of a deal. I mean sure water and dirt could make it into the intake, but the car would still run just fine. After the MAF though, that would cause just about all the symptoms you mentioned.

Either one could have been the sole culprit, or it could've been a combination of the two. Glad it worked out for ya!

 

the hole liooks to be after the maf, possibly where the pipe contacts the metal in the engine bay.

 

Yeah, that's what it looks like, I just wanted to be sure

 

yea the new one is bosch.. the O2 sensor that was all jacked up was the stock one thats been on the car since i bought it at 35k miles and i just hit 76k yesterday... it was the first bank o2 sensor.. the hole that was in the intakewas after the maf but it wasnt there when i took it out a couple weekes ago when i cleaned it.. i think it jus rubbed a bunch... i really think it was the combo of them both.. mainly ill put my money the O2 sensor being the lead fault..