Misfire rough idle and codes for knock sensor misfire and O2 sensor

2003 PONTIAC BONNEVILLE
170,000 MILES • 3.8L • V6
Avatar
POORPONTIAC
  • MEMBER
  • 2 POSTS
I am getting a code for o2 sensor and misfire code. it idles really rough and loud a slight knock from around the driver side somewhere. I have fixed a lot of things including spark plugs, wires, EGR sensor, ignition coils, oil change. when I do drive it has a bad kick and hard time shifting tough start up and rough idle. I thought maybe it had a vacuum leak. I have sprayed throttle body cleaner all over, but I cannot hear any idle change. I have even tested my fuel injector connection with a voltmeter and they read just fine all the same. can anybody help me because I am stumped and cannot keep putting money into it? but, my wife and I need the vehicle to get to work.
Apr 13, 2017 at 11:48 AM
Advertisement
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
misfires are best handled by a mechanic as it can be a sensor bad, injector or basic engine problem. It can also be from low fuel pressure. take to a mechanic instead of dumping money into parts that may be good and not need replacing if engine runs bad transmission never works right.
Apr 13, 2017 at 12:11 PM
Avatar
POORPONTIAC
  • MEMBER
  • 2 POSTS
I can handle most everything except transmission, but it is my first and will be my last Pontiac.
Apr 13, 2017 at 12:27 PM
Advertisement
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
wait on trans until you straighten out engine that may be the trans problem as well because engine isn't running right
Apr 13, 2017 at 5:28 PM