I have a 89 rs, with an L03, which is fairly stock with the exception of headers, cat, Cat back, open element, wires, cap etc, underdrive and smog & AC delete.

When the car is cold, it runs great. Actually let me re-phrase that, the car runs great all the time, its just that when you first kick it over and its not up to optimum temp its has significantly more pop when you step on it. And I know its not the open element sucking hot more hot air which is causing this cuz its the same with the stock element on too.

Any ideas why its like this, I was thinking that it might be that the computer is telling the car to run a little bit ritcher in the warmup stage and then backs it off when it is warmed up. If this is the case would bumping the fuel pressure solve this drop in power when it is cold vs. warm?? Any ideas??

 

Try removing the ecm fuse that is next to the battery for abot a minute then reinstall it. Then go out and drive the car for about 20 minutes. After the first 10 minutes start driving it like you stole it and see if you feel any changes. Resetting the ecm helps it realize you have made some changes and may solve the problem, if not you will probable have to bump the fuel pressure up.

Steve

 

Sounds normal to me....a car is always gonna have more "pop" right after its started and cold. Its gonna be running richer cause its in closed loop, plus the intake manifold is still cold so you get a colder charge.