tensecls1

i just finished installing my lt yesterday and the ses light came on. i hooked up my scanner and found 4 codes where set. The codes where p0140,p0160, p1133 and p1153. The all have to deal with the front 02's (insufficent switching activity). I drove the car open headers home until i get the exhaust done. The headers are slp and i removed the egr and air. I had the car tuned to remove the egr and air pump codes and i think i removed all the rear o2 sensor codes. I think the fact that the o2 sensors are so close to the exit of the header that they are causeing the car to set these codes? The LTFT is in the 20's and way out of wack numbers for the o2 sensors. Will putting my dual muffler set up fix these codes or will i need to build a new tune to get rid of this problem(so i build can build a tune to get a full benefit of the exhaust). I also just replaced the o2's, spark plugs,and spark plug wires about 4,000 miles ago. Thanks for any help

Keenov

iTrader: (5)

Did you make your own extensions?

tensecls1

No I Used A Set I Ordered From L And M Performance

blkZ28spt

I ran open headers for weeks after I installed my headers. The only code I got was due to a bum O2 sim. BUT from what I remember the SLP design has the O2's extremely close to the exit of the headers. How many inches is it, do you think?

TXZ28LS1

iTrader: (5)

i had the same problem when i did my hooker headers and off road y. the insufficient switching. its most likely that you have bad 02 simms. so what i did is that i sent them back to thunder racing and they sent me new ones.

tensecls1

the o2 sensors are 3 to 4 inchs away from the exit of the header. For the sims are you talking about the rears? because i think i elimanted them correctly with ls1 edit... I just want to know if the mufflers are going to fix this so i can build a system. I was planing on running to magnaflows under the car(because i access to the them) connect to the headers with about roughly 10-12 inchs of exhaust pipe

WILWAXU

iTrader: (6)

IMO, the O2's aren't staying hot. I would put the 12" extension on it before diagnosising further.