bryanbassett

iTrader: (1)

I was having a problem with this before winter and I purchased a new throttle body. Everything was fine all winter but now it's back. Pretty much anytime I drive my car longer than 20 miles I get engine power reduced.

So what I do is pull over, pop the hood, unplug the two cables from my computer, wait 30 seconds and plug them back in. BOOM, my car runs great, sounds great, accelerates great. NO PROBLEM AT ALL, and then when it decides it hates me again, the message is back and I'm barely accelerating.

I have some error codes but I have a suspicion that they are fake or are being caused BY the enging pwr reduced mode.

Here they are:
P0030
P0036
P0102
P0135
P0141
P0443
P2135
P0053
P0054
_________________________

So this has been pissing me off pretty hard for a few weeks now. Any idea what the hell could be going wrong? My car literally runs like a champ when it's not in this mode.

Could my computer have gone bad? Could my throttle body somehow gone bad again?

I don't know what to do and I really do not want to buy a new computer and get it flashed and programmed because thats a heavy chunk of dough.

Please help.

This is a 2008 Cobalt LS. Manual.

I thought maybe it was connected to turning on A/C but I tested that theory today and I still got the message. Had to pull over halfway to work and do the whole routine.

ECaulk

iTrader: (6)

Well most are for your oxygen sensors, both of them. Bank 1 sensor 1 and sensor 2, which would explain why it runs ok for a bit then goes into pwr reduced mode. I'd start with both sensors since they are cheap (~40-50 a piece). You're still throwing a code for the throttle position sensor, could be a bad connection or your tb is done get one from o'reilys with the lifetime warranty, and you have a code for the EVAP not sure if the solinoid or the canister. One of those is for a MAF but given you have oxygen sensor issues I'd wait to buy a maf.

bryanbassett

iTrader: (1)

The weird thing is I did replace one of the o2 sensors after the throttle body. I'm pretty sure they can't just go bad this fast... right?

ECaulk

iTrader: (6)

Could be a connection. Could be a bad o2 sensor, could be a wire

bryanbassett

iTrader: (1)

it would be cool to get a couple other opinions before i do anything - anyone else have some ideas? or does everyone agree?

no_ss

iTrader: (2)

Anytime I see ecaulk post he's pretty accurate.