![]() ![]() As a reference, in 96 the LT1 came with EGR but the LT4 didn't have any EGR from the factory, because its cam had enough extra overlap to make it unnecessary. ![]() Re the EGR, fwiw, with an aftermarket cam that has a little more overlap than stock the engine is probably making its own EGR just due to overlap. I know the benefits of EGR, but if I can get headers without the EGR fitting, that would be aesthetic. ![]() The exhaust manifolds have cracked at the downpipe flanges, so its an excuse to buy headers and a new exhaust system AIR is already deleted on the car but the EGR remains. The real question I have to decide on is whether or not to delete the EGR system. Obviously it needs to be tuned, but i'm just taking care of the little tick tack items before I spend money on a tuning session. The car has an unknown aftermarket cam in it, but stock aluminum 1989 heads and running a stock ECM PROM chip. Getting a rough idle in closed loop, with just a very very slight rich exhaust. I have a feeling the O2 sensor is throwing bad data, but not enough to throw a code. I just want to see the live data to find out if any sensors are throwing bad data. It's also hard to imagine anyone taking the time to write code for a data logger for Macs, especially 15-20 years ago, since there just weren't that many out there.Agreed and agreed. As with the Jet software for OBD2 cars, my guess is that anything you find will be a lot happier running on Windows XP than on any newer OSs. ![]()
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