Originally Posted by kenman1717
My '03 has been getting worse, towards the end of last year every couple weeks it would throw a MAF performance code under a hard acceleration from a stop, cleaned MAF numerous times and replaced air filter numerous times, got fed up and replaced MAF in February of this year under the advice of a GM driveability tech. Truck was good until about June then it threw lean codes for bank 1 and 2, under hard accel from a stop, cleared codes first time, bought a fuel filter but didn't get a chance to change it. light came back, about 2 weeks later scanned same codes, didn't bother clearing, light went out a few days later. Changed the fuel filter and put in injector cleaner, but the next day the light came back on after an uphill accel from a stop, didn't bother checking it or anything, then on Friday of the 2nd week of July, I could hardly go up a hill, truck was bogging and had no power, so I went and scanned it was for CAT efficiency bank 2, I couldn't do anything about it, as my truck was going to the body shop for an insurance door for about a week, so I cleared the code. When I got the truck back, not really thinking about the check engine light coming back I went for a drive on the highway to see if the body shop fixed the wind noise, so i'm accelerating up a hill, it bogs down and the check engine light starts flashing, when I get to the top and start to cruise, the light goes out, turn around, same thing happens again. Unable to do anything about this right now I try to baby the truck this week. Light stayed off until today, was flashing, going out, staying on solid, didn't matter up hill or not. I scanned it again, all it says now is p0300 cylinder misfire, checked misfire history all even cylinders on bank 2 had thousands of misfires. At idle it wasn't misfiring, only when I reved it up did they start. I read online about similar problems that people are having with these trucks, and it seemed that a common thing was the CAT and deteriorating spark plugs do to the ethanol in the gas. I just took a bosch spark plug course, and they talked a lot about ethanol ruining the plugs so they introduced iridium plugs that stand up the high content of ethanol. So I guess i'm wondering if, updating the spark plugs and doing something with the CATS might remedy this situation. Any help is appreciated.
2003, 4.8l, 247000kms, plugs/wires done 20000kms ago, in feb 2012, fuel filter at same time, I try to do it every 20k, did it in june for the lean code.
sorry for the long post, a lot of info, maybe not all needed.
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