BIG PROBLEMS! HELP!
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TECH Enthusiast
Joined: Jan 2003
Posts: 582
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From: Birmingham, AL
BIG PROBLEMS! HELP! I recently installed headers. I haven't had time to order O2 sims yet, so no sims. My passenger side O2 I know is hooked up right. I had to take it to an exhaust shop to get the drivers side bung fixed and I'm thinking he used the rear O2 plug to plug it in. Heres why I think that... O2 B1S1 and B2S2 are reading 890-905 at IDLE and dont change at WOT. O2 B2S2 and B1S2 read 450 constantly. My LTFTs and STFTs are staying at 0 no matter what. Someone tell me WTF is wrong here. I cleared the codes and everything but still nothing. Need HELP.
Re: BIG PROBLEMS! HELP! Did you mean the S1's are at 890-905? you have a double type on the B2S2 so have to ask. If both B1 and B2 S1s are there, your good.(at idle and WOT, between there should be activity)...better than me at least. And the S2' will read 450, throwing a code of insufficient activity. Jack it up and check thought if thats not the case and see which is hooked up where, it should be obvious from the connectors.
You can also try swapping your rear O2's into the front O2 harness and see, they me be bad now!
You can also try swapping your rear O2's into the front O2 harness and see, they me be bad now!
Thread Starter
TECH Enthusiast
Joined: Jan 2003
Posts: 582
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From: Birmingham, AL
Re: BIG PROBLEMS! HELP! I have 2 more sensors I can try. 
They dont hardly switch but throw no insufficient switching codes. The first sensor description was correct. Second should be B2S1 and B1S2.
They dont hardly switch but throw no insufficient switching codes. The first sensor description was correct. Second should be B2S1 and B1S2. 
Re: BIG PROBLEMS! HELP! I'm not following your sensor descriptions very well, but if you are getting readings of 890-905 on B1S2 and B2S1 and 450 constant on B1S1 and B2S2, then you have the wrong harness plugged in on the drivers side.
You want to see readings other than 450 on both sensor 1's and 450 on both sensor 2's which should be open.
You probably threw the PCM into a "safe mode" and that is why you aren't seeing any changes in LTFTs or timing. It puts it in a safe closed loop tune. It won't run properly without the sensor 1's plugged in and reading.
You want to see readings other than 450 on both sensor 1's and 450 on both sensor 2's which should be open.
You probably threw the PCM into a "safe mode" and that is why you aren't seeing any changes in LTFTs or timing. It puts it in a safe closed loop tune. It won't run properly without the sensor 1's plugged in and reading.
Thread Starter
TECH Enthusiast
Joined: Jan 2003
Posts: 582
Likes: 0
From: Birmingham, AL
Re: BIG PROBLEMS! HELP! Yeah, thats what I was thinking, but the damn exhaust guy kept my O2 extention! I will get that plugged in and hopefully my trims will magically begin working again. I ordered O2 sims so they'll be here next week. Yes, the exhaust guy did plug the drivers side O2 into rear plug. Thanks for the info!
