I have started having a strange issue with my AFRs at steady throttle. I am SD tuned, and just replaced my O2s to try and get it dialed in, but no luck. If I hold the throttle steady at around 1500 (or whatever) the afr (per my mounted gauge) will slowly go from 12-1 to gauge max of 18-1, over and over/back and forth (surge) I already have the VE table at around 1/2 what most run, and the STFT are still wanting it lower.
Any thoughts?
Thanks

 

I am concerned that my injector tables are not set up correctly.( I have 80lb injectors.)
I will admit I do not know how to set up all of the tables, so someone else set them up for me when I swapped over to the 2002 PCM I have now.
Hint; I have never gotten the car completely right since I swapped....

 

You have the best tuner in this part of the country right there in your back yard. Mike Carnahan at Vengeance Racing can have that engine dialed in so fast, it will amaze you.
I had all kinds of issues too after several mods and I ran into some guys at a local car show who recommended Mike to me. I wish I had known about him sooner... would have saved me alot of time, money, and stress.

 

You must have your injector slope set right in order to even begin to try and fine tune your engine---More info on your injectors would help----Most all aftermarket injectors are rated at 3 bar (43 psi) However a Corvette is rated at 4 bar ( 54 psi) So you need to know what injectors you have---You can make a 3 bar injector work on a corvette but you have to make an adjustment to the IFR tables to compensate
Having larger than stock injectors than stock without the proper tune adjustment will make your car run extremely RICH---This seems to be your case since you said you cut your VE tables in half----Which is a backwards band aid fix---

 

Thanks TB
The injectors I have are rated at 80lb @ 43psi (per the vendor) I calculated them in the HPT tools to check the table.
The thing that is so interesting, is the 02s are just not cycling/fluctuating very fast. They will (both) go high (9xx) for a few secs, then low (0xx) for a few secs., which is causing the rich/lean issue. It mostly does this much worse in park, as opposed to while in gear. On top of that, when I first crank the car, it goes to around 18-1 AFR for a few secs...

 

Couple things If you have a larger cam you need to alter the MAP setting MIN in your tune----A stock engine will idle at about 30 KPA--but with a larger cam it can idle as high as 70 See where your car idles at in KPA and then set the PE map trigger to be just over that number
Also--delete the COT system --cat overtemp--- with LT headers often they again will trigger a false enrichment to protect the cats--
Finally again with LT headers because they re locate the front 02 locations as much as 3' further aft---the 02's do not heat up properly or read correctly---There is no 100% fix for this---and is why LT's are illegal in most states----You can do a few things that have helped in my experience----1st install the rear 02's onto the front locations---The rear are far more sensitive and read better---2nd you can change your "02 switching points"
Lowering them will make them oscillate at a lower voltage and will make the P/ fuel leaner-rasing them will make it richer-----The most common switching point is like 450-550 millivolts--- experiment by removing 100 points to the entire table and see if the 02's will move more rapidly and with a wideband see if your P/T AFR's get closer to 14.68
PS on my 98 car I was never able to get the AFR's back to 14.68---the best I could do was around 14.2 and I settled on that---( with LT's)