o2 sensors with LT's not hot enough. Tips.
 

It has come to my attention lol that lots of LS1's with LT's are throwing insufficient cycling codes for the front o2 sensors (P1133,P1153), and many folks believe it is due to the sensor being too far down stream to heat up.

Tips I 've seen on these message boards:

• Wrapping the headers. (Helps retain heat)
• Use of Bosch 13111 sensor (Rear Corvette sensor has higher heater wattage).
• Reprograming the PCM to make it easier to pass self diagnostics.
• Different type of engine management. Running open loop, custom tuning, speed density.

I'm not too keen on wrapping my headers. The downfalls of doing this are well known. I wonder if ceramic coated headers would help.

It won't be until after I install a H/C combo that I will have any professional tuning done.

The speed density and open loop. I'm really not sure what the heck that's all about at this point lol.

I will install some Bosch 13111's this weekend and see what happens....

Are there any other tips out there?

I have a few ideas I might try....

I'll see if I can cobble the metal shields from the stock spark plug wires onto the 13111 o2 sensors. I figure this might help them hold the heat better.

On the stock exhaust, has anyone else considered what the function of that little shield forward of one of the o2 sensors is for? The sensor it is used on is the one most exposed underneath the car. Does this shield help hold heat in, prevent air cooling, or is it there just to protect it from debris flying past it?

I had that code thrown when I put my ceramic coated pacesetter LTs on. When I had my codes for AIR EGR and Rear O2s removed the tuner saw that these codes were set. I was a little concerned but he told me that it was not uncommon on some longtubes and that he would just remove the code completely from the computer. So it seems like there are no adverse effects to having the code removed other than the A:F maybe not being correct, but you need a dyno tune to tweak that anyway after longtubes.

But I am going on a few months w/out a dyno tune on this setup and have not seen any significant changs anywhere, even with gas mileage.

sure hope i don't have that problem....edelbrocks going on with 13111 02's next week..if it triggers this,does the emmisions guy know/can he tell it has been tampered with ??--if it has been deleted of course... we have sniffer,roller,and obdII checks.....[ cats will be back on,and no visual] GOOD LUCK..let us know how it turns out please... :judge:

I've heard the only real sensor the LS1 really needs to run is the crank trigger. The rest can just be tuned.

The shield in front of the 02 is used to deflect debris, with the 13111, you get alot of wire (the harness is very long), so think about places to tie it up to (you can loop it on itself they come with zip ties)
FWIW I've been using the 13111s since Dec, (daily driver) and haven't had an o2 code, so if you can't get a tune, then IMO those are the best solution
Don't bother with the plug heat shields, IMO you're wasting your time

okeedoke. They'll go in tomorrow.

I hope I don't get any more codes! :judge:

Thanks.

I've been doing this trick for about 3 years now. When you get in the car, turn the key to accessory for about 30 seconds, then start the car. This will give the o2 sensors the time needed to reach a warmer tempreture. Not fully heated, but already started the warm-up prior to start-up. Never had the code come back on since doing this.

There was some length discussion last year on the HPTuners forum about how to tune for the slower reading O2's. My tuner knew how to do it as well ( GMRSpeed.com ). However, I've been running Bosch 13111 since late 2004 and haven't thrown a code yet.

I'm lucky enough to have a wonderful tuner in the area, Don, from Dez Racing. I bet he knows what to do.

FWIW, I installed the 13111's today and went for a good long buzz. The car ran well and afterwards there were no pending codes. So for now, all is well. *crosses fingers*

I hope everyone is having a fine holiday and staying safe. And don't forget the true meaning of Memorial Day. This holiday commemorates U.S. men and women who died in military service for their country. Props to them for making the ultimate sacrifice :hail: .

This is good information! I'll add a link to it in the FAQ, keep the information rolling in guys. :)

Are you kidding? $240 just for 02's?

Do you guys think that this will happen with Mac mid tubes???? I have some goin on my ride the 15th of march...... so i'm a lil curious:)

What about welding bungs right onto the collectors?

more like 125-140 for both

I paid $110 out the door for mine. Where do you get $240 from?

I'm going to try the Corvette 02s and see what I come up with. My car is throwing about an ungodly amount of codes about my front 02s failing and not having rear 02s.

where did you get yours from? I need to get some now since my stock ones are pretty much done for.

I paid $136 this weekend for Bosch 13111 at Autozone, fwiw. My set from 2004 finally died.

I just paid 52 including tax for my 13111's at my local Autozone.

FWIW, I recall the 98s have more of an issue with this than any other year. I ran coated jet hots without cats on my last 98 and it said the codes with stock O2s and 13111s, so I just tuned them out. On my current car with TiTech coated Edelbrocks, cats, and 13111s, I got no codes.

anyone else have problems wit there 98s and the 13111s. I have a 98 T/A throwin all kindof codes. was going to get some new sensors soon but would rather not throw 140 bucks down the drain.