sas4ever Posted July 18, 2013 Report Share Posted July 18, 2013 i have a 92 grand prix 3.1 v6 122k about a month ago it started running really rich out of no where.so i cleaned out the egr valve and it seemed to fix it but then randomly it would run ridiculously rich..(i.e. black smoke, having to keep my foot on the gas to keep it running.) so last week it seemed to happen more often and i ended up replacing the CTS(coolent tempature Sensor), O2 Sensor, TPS(throttle position Sensor), EGR..none of these made a bit of difference..i then got it to act up and noticed that the entire exhaust was glowing cherry red..so instead of spending about 300 on a new cat install..i cut the old one out and replaced it with straight pipe..however none of this has helped the situation..feeling really frustrated and about ready to sell it cuz im so fed up with it..tonight im going to put spark plugs in it because im sure they are fouled due to how rich it has been running.. PLEASE IF YOU HAVE ANY SUGGESTIONS OR IDEAS FEEL FREE TO LET ME KNOW.. ALSO SOMEONE TOLD ME IT COULD BE CAM AND CRANK SENSORS???THOUGHTS??? LET ME KNOW IF YOU NEED ANYMORE INFO Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted July 18, 2013 Report Share Posted July 18, 2013 you don't have a cam sensor. and crank sensor doesn't really fit the symptoms. have any codes been set? does the SES light operate normally? fans stuck when running badly? no speedometer? Quote Link to comment Share on other sites More sharing options...
sas4ever Posted July 18, 2013 Author Report Share Posted July 18, 2013 yes it sometimes will turn the ses light on and when i have caught it on it sends code 13- for a short to the O2 sensor... no the fans spin fine and no issues with the speedometer Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted July 18, 2013 Report Share Posted July 18, 2013 13 is the O2 sensor essentially being "lazy" in that it never moves outside of the ~.35 to ~.55 voltage range. this only happens when the O2 sensor stays much colder than it should be, a dead O2 sensor(what brand did you replace it with?), an O2 sensor to ECM wiring issue, bad grounding of the sensor, faulty ECM. Quote Link to comment Share on other sites More sharing options...
sas4ever Posted July 19, 2013 Author Report Share Posted July 19, 2013 i replaced it with a BOSCH O2 sensor....and when i put a tester to the connector that goes to the O2 sensor its not getting power or if its such low voltage that my tester isnt seeing enough.. ALSO- I replaced the idle air control.. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted July 19, 2013 Report Share Posted July 19, 2013 what kind of voltage you'll see is highly dependant upon your meter. if you want to test O2 sensors, digital with 10Mohm impedance is a good place to start. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.