Does anyone have a stock tune file for a 1996 Z28 (LT1) with automatic trans? I am using JET (formally tuner cats) to read/write the PCM. I wanted to compare tables to see if it has been modified.

I am trying to track down some exhaust noise during deceleration and I am thinking the problem is with the spark table because I am getting a lot of knock retards through the rpm range.

As far as I know it the car is mostly stock (intake and exhaust). I am not sure if someone before me modified the tables or if I have other problems.

thanks in advance if anyone has one!

 

are you saying the exhaust is not stock or is stock? headers will set off knock sensor.

 

Sorry, I should have been a little more clear with my post.

As far as I know it the car is mostly stock. The car has an after market K&N intake and a Borla cat back system with stock exhaust manifolds.

I understand that headers would throw off the knock sensor. I was thinking about comparing the tables before I start backing out some timing or chasing down the knock sensor/module (the whole 100 octane to see if it is phantom knock or possibly converting over to LT4 KM).

 

The noise from the exhaust I started chasing is popping during deceleration after a 3/4 or WOT. My guess is she is running rich because she also has black around the tailpipes.

I have not hooked up my wide-band yet to look at the A/F (I will hopefully get to it tomorrow since I didn't have a chance to do it today).

 

yep it sounds like its rich, you will get a certain amout of popping no matter what. it takes the computer a small amount of time to shut the injectors down which leaves some extra fuel right after heavy throttle to no thottle, popping is the extra fuel burning in your exhaust.