I took it to GForce for a dyno tune after a stock LS6 head install and Torquer V2 112 install and it started losing power up top in the 4K-5K area and started popping and backfiring randomly(at idle, and driving speeds) and made the most of 314hp. So we took it that one or more cylinders wasnt getting spark and the unburned fuel was detonating in the exhaust(hince the poping and backfiring). So when I got home I changed the plugs(TR55s) and plugwires along with the TPS and IAT sensors. The car runs alot smoother and doesnt backfire or pop under some moderate engine load and doesnt pop or backfire at idle anymore. Im going to change my MAF cause my A/F ratio was off the chart with mine and we put another MAf and the A/F line didnt spike llike the old one and was much smoother. Anyways I was driving my car and noticed my oxygen sensors were fluctuating all the way from 80 mV to 800+mV and was running 14% lean on my long term fuel trim on bank 1. I was also getting a lil bit of knock retard i noticed but no more than 3*
I have two questions:
Are my o2 sensors becoming lazy????

-and-

Is it common to get some knock retard with those mods I did(in Sig) and have a stock tune??

Thanks!!

Travis

 

Get that thing tuned properly, and have your problems will diminish if not vanish.

 

Make sure you have no vaccum leaks or header leaks.. That will casue the car to run real lean and ping and on the big end.

 

It doesnt pop/backfire anymore. But what do yall think of those o2 sensor readings i described bank 1 sensor1 (80mv-800+mv) and bank 1 reading 14% lean. Also on the dyno my MAF made my A/F ratio line sky rocket rather than the other MAF we put on which was much smoother. Yall think change the o2's and get a new MAF then go back to the dyno?? KR common after cam install with a stock tune?

 

Ttttt

 

ttttt before i mow the yard...

 

you will get KR on a stock tune with a big cam...

 

ok good. thats exactly what i wanted to hear!

 

I did really bad.

 

is a Torquer V2 232/234 .595 .598 112+2 considered a big cam?

 

It is more aggressive than mild.

 

That's pretty big. Same size as an F14.

 

Ok i put the MAf and o2s in and the car STILL has not poped and seems to be running better than it did. I hooked up my predator and the Short terms were 0%(constant) and Bank 2 +13.28% and Bank 1 i believe was a lower positive number like (+2, or 3). My o2s are reading better i believe. I have the stock tune, is all this normal to be running lean like that and have an OCCASIONAL no more than 2.5-3* KR?

I hope im ready to tune it, not sure maybe you guys can figure it out for me

 

there is the problem.
Get a REAL tune in there and you will be a happy camper.

 

oh no no, i bought that predator VIN LOCKED i have a stock factory tune i just use it to monitor real time data(i.e. Auto Tap)

 

Ahh, I hate the predator or superchips or hypertech for that matter. It is just guesswork at that point. Apparently it is a legit monitoring tool, but I prefer the laptop sitting beside me running EFI Live or HP Tuners.

 

True do u think the inj# im running is too small my 99 Stockers(26lbs) for that cam or i should be fine...

 

I still run my stockers with the 244/248 cam. I really want the SVO 30#'ers though.

 

26lb'ers on a 244/248 @.50"...god damn...lol

If those are not maxed out im sure they are very close to being maxed, ha.

anyways so i should be good? Thats the only reason i was thinkin why i could be running lean...? I dunno I dont want to go to the dyno tomm....AGAIN...and be sent home....AGAIN...I want to fix it and come home happy....Please restore some confidence in me lol....

 

I run my injectors at 114% duty cycle. I am asking for a ****-ton of trouble. I don't do too many WOT runs due to that simple research. I already run lean as a bitch.