93 LT1 Running rough, code 44
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Joined: Mar 2012
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From: NH
93 LT1 Running rough, code 44
Started the car up to drive to work (8mi drive) today, started fine, but started running really rough about .5 mi from my house at a stop light. When I was driving, it seemed to smooth out but felt really under powered and my instant gas milage gauge was terrible. about 5-6 miles into the trip, the SES light came on. When I got to work, it was still idling terribly, the fans were on. I pulled a code H44 with the trusty paperclip. O2 sensors are fairly new as I put in heated O2's to go with the Long tube hearders this spring. I dont have my FSM handy at work so I may be answering some of my own questions tonight when/if I get home.
I am suspecting that there actually is something causing the O2 to see the lean condiction and not the O2 sensor gone bad. I think this becuase the O2 sensor is pretty new, and because it still idles like crap after the SES light came on. It is supposed to go to open loop when that happens and ignore the sensor right? Therefore it should idle just like it does at initial start up? Anybody have any ideas what would be a likely cause of a lean condition? I will hook up the laptop and run datamaster on the way home to see if I can get anymore insight, anything I should look for?
I am suspecting that there actually is something causing the O2 to see the lean condiction and not the O2 sensor gone bad. I think this becuase the O2 sensor is pretty new, and because it still idles like crap after the SES light came on. It is supposed to go to open loop when that happens and ignore the sensor right? Therefore it should idle just like it does at initial start up? Anybody have any ideas what would be a likely cause of a lean condition? I will hook up the laptop and run datamaster on the way home to see if I can get anymore insight, anything I should look for?
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From: NH
I went to 3 wire heated O2 sensors becuase the single wire (unheated) kept going into open loop everytime I stopped or slowed down. The long tube headers position the O2 sensors farther back and let off more heat than the stock manifolds so the single wires dont stay hot enough to stay in closed loop, which is where I want to be for best performance and fuel economy.
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From: SF bay area C.A.
C4 of the Year Finalist
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Instructor
Joined: Mar 2012
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From: NH
Nevermind, problem solved. The INJ 1 fuse was loose for some reason, tightened the contacts and it runs fine again. Part of the joys of owning a 20 yr old car, I guess. I cant believe I could drive it on only 4 cylinders!
