Alright, I bought my 00' Grand Prix GT About 3 weeks ago and other than some clean-up, the car pretty sweet. I drove it for about 2 weeks and noticed the engine misfiring and at the same time of course, the service engine soon light came on and is still there. I had a local parts store check for codes and two codes came up...175, and 305. Before having it checked for codes, I replaced all of the spark plugs and wires...I was hopeful that this would take care of the problem, but it didn't. Possible causes for the code 175 are: fuel pressure condition or MAF sensor fault, Failed O2 sensor, Ignition misfire condition, fuel injector problem, or Engine mechanical condition. As for the 305 code: Ignition fault-spark plugs, wires, coil, or vacuum leak, injector fault, and high or low fuel pressure. My question is...can any one on here tell me if one of these is more likely to be the problem, and can any of these causes be ruled out? Like I said, I did change the plugs and wires...been working on cars (much older cars) for a long time, but When it comes to cars loaded with sensors, honestly I get into trouble.
Originally Posted by W-Body Store
