PCM Diagnostics & Tuning - Wierd tuning issue

We tuned my car thinking we had a 160 thermostat. later after trouble shooting why the temps didnt reflect the thermostat we determined it had the stock thermostat. We replaced the stock thermostat with a real 160 and now after a couple of hours the idle is super rich. I run on a open loop tune. any ideas why this is happening.

if you're cooling your engine better (that's what the tstat supposed to allow to happen) that means you get more airmass. in open loop, fueling is dependent purely how how you describe your airflow (usually through VE table). thus, if you are cooling your motor better, and not adjust your VE tables to reflect the true VE, you should be dumping not enough fuel (aka lean). this is the opposite what you're seeing. so it might be the computer detecting it and dumping too much fuel to make up for it. but that sounds like closed loop behaviour, so that's probably not it either.

how did you tune your idle? did you adjust the OLFA table at all? that'd be my first guess.

post your tune and logs before and after, that'd really clear things up.

if you're cooling your engine better (that's what the tstat supposed to allow to happen) that means you get more airmass. in open loop, fueling is dependent purely how how you describe your airflow (usually through VE table). thus, if you are cooling your motor better, and not adjust your VE tables to reflect the true VE, you should be dumping not enough fuel (aka lean). this is the opposite what you're seeing. so it might be the computer detecting it and dumping too much fuel to make up for it. but that sounds like closed loop behaviour, so that's probably not it either.

how did you tune your idle? did you adjust the OLFA table at all? that'd be my first guess.

post your tune and logs before and after, that'd really clear things up.
I cant say for sure. All I know is the exhaust now burns my eyes horibly wereas before the tstat it wasnt like this at all. Is the strong oder a sign of lean or rich condition?

adjust OLFA table

it can be both, but it really depends on mods and such--do you have cats? how big is your cam? do you have a wideband?

Here are my mods. I have no cats

02 Z28 SHORT BLOCK
FRESH REBUILT TRANSMISSION LESS THAN 5 MILES
HPT TUNERS TUNED PCM
ASP UNDER DRIVE PULLY
TRANSGO SHIFT KIT
TSP PRC STAGE 2.5 HEADS, SS 2.04 INTAKE VALVES, 1.575 EXH VALVES, PRC DUAL VALVE SPRING KIT, AND TSP HARDENED PUSHRODS.
ROLLMASTER SINGLE NON ADJ TIMING CHAIN
TSP LS6 PORTED OIL PUMP
TSP 233/239/113 CAM
PACESETTER CERAMIC COATED HEADERS
TRUE DUAL X PIPE EXHAUST W/ spirals
FORD 30LBS INJECTORS
YANK 4000 STALL TORQUE CONVERTER
TR55 SPARK PLUGS
160 DEGREE THERMOSTAT
3.73 REAR GEARS
K & N AIR FILTER

I dont have a wideband but I have acess to a dyno. Also does adjusting the ofla effect idle because Im also having idle issues. The car shuts off when I let off the gas to fast, in reverse, or when driving below 1500 and stopping.

adjust Base Running Airflow...

Thanks. Ill give it a shot and report back.