2002 Running rich after long tubes?
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On The Tree
Joined: Apr 2007
Posts: 106
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From: MS
2002 Running rich after long tubes? Hey guys. I installed a set of Pace setters on my 02 Trans am and now I'm throwing a PO153 code saying the back 2 sensor 1 slow responce. Well I replaced the O2 with one of the leftover sensors from the conversion to LTs. After a couple days the code came back. While I was sitting at the drive through yesterday my eyes started burning and I realized that it was the car running rich. Is this normal? Why am I still throwing this code (that went out but I'm sure will come back)?
Vinny
Oh yeah I have a Diablo sport programmer for the car
Vinny
Oh yeah I have a Diablo sport programmer for the car
You need a tune, the hell with the programmer. Did you put the pre-cat 02 sensor back in the pre-cat 02 slot? You didn't plug the post cat 02 sensor in the pre cat plug? Right? An did you you use 02 sims or delete the rear 02's?
Headers will make you run a little rich and they will smell if you dont have cats. However I dont think it should trigger an o2 code especially since some people dont get tunes or wait until other mods are done.
Joined: Nov 2003
Posts: 6,216
Likes: 236
From: Wichita KS / Rancho San Diego
Tune or no tune, it's difficult getting O2's to work right with LT's - a hit or miss proposition. There's nothing wrong with using a post-cat sensor in the pre-cat position. Search the PCM & Diagnostics forum and you'll find lots of threads and information.
if you put a post cat sensor in a pre cat bung thats still connected to the rear position... ITS STILL GONNA THROW A CODE.
leave the front O2s... there shouldnt even be a post cat bung since you did an LT swap? and delete the rears from the Tune. The fronts will still read right in the aspect of tuning, its preferred to use a wideband but they'll do.
leave the front O2s... there shouldnt even be a post cat bung since you did an LT swap? and delete the rears from the Tune. The fronts will still read right in the aspect of tuning, its preferred to use a wideband but they'll do.
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if you put a post cat sensor in a pre cat bung thats still connected to the rear position... ITS STILL GONNA THROW A CODE.
leave the front O2s... there shouldnt even be a post cat bung since you did an LT swap? and delete the rears from the Tune. The fronts will still read right in the aspect of tuning, its preferred to use a wideband but they'll do.
leave the front O2s... there shouldnt even be a post cat bung since you did an LT swap? and delete the rears from the Tune. The fronts will still read right in the aspect of tuning, its preferred to use a wideband but they'll do.
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Verdad Gallardo Joined: Nov 2003
Posts: 6,216
Likes: 236
From: Wichita KS / Rancho San Diego
Right. Obviously you have to disconnect the post-cat sensor to the pre-cat harness. The point to swapping them is to test if the sensor is bad or if the problem lies elsewhere.
you will want to install the vette o2`s up front to stop you from getting codes. right around 03 the z06 vettes had longer tube manifolds and they ran hotter 02`s to copensate for it. and the wiring is longer, so you can kill two birds with one stone! i put these on my 2000 t/a and the codes went away. with long tubes it takes a hotter o2 to get an accurate reading because of the increased volume of the header pipes.
Launching!
Joined: Jun 2009
Posts: 268
Likes: 1
I think you mean BANK 2 sensor 1 which is the front O2. The O2 is switching slowly the headers will not effect that at all. I have done many long tube instillations in my shop and all we do is lengthen the leads. Long tubes will not richen up the mixture. The O2 pre cat sensors adjust the mixture. Your sensors are slow to respond change them out with new ones and you will be good to go.
Staging Lane
Joined: Apr 2009
Posts: 82
Likes: 0
From: Seguin/San Antonio Tx.
yes in fact it will b/c the o2 being positioned so far down from the stock location they are not staying as hot which will make the slow to respond, this exact same thing happened to me, i fixed it by using new GM sensors get new ones and do not use bosch sensors only for very few people do the boschs work otherwise their crap trust me i learned the hard way.
