less reponse when car is fully warmed up

ASSISTANCE Stock Engine-Bay Components
1

I’ve noticed that my car is noticeably less responsive and doesn’t accelerate as ‘effortlessly’ when the temp gauge is halfway, as opposed to the first 10-15 minutes of turning the car on.

I know that a colder engine should maybe run a little bit better but I don’t know why my car seems to progressively get more sluggish as it gets to normal operating temperature. With a cool engine, the car drives like new: the acceleration is brisk, the engine is smooth and quiet and it will coast for a long time if I let off the gas. But once it’s warmed up to halfway it doesn’t run so smooth; I have to press the gas pedal a little harder and rev higher to get the same response as when it’s cold.

The car has 155000 miles and I was thinking of replacing the radiatior to hopefully fix this, as well as replacing the timing belt and water pump.

I’m also using a short-ram intake so it’s possible that the hot air from the engine bay is causing slight power loss. Would that even be noticeable?

Any suggestions?

2

Well I really dont no what to say but yes when ur car is cold and u drive it, they tend to run a lil lean. Same with how u can notice the exhaust fume even more while ur car is warming up? Maybe what i can say is that when ur engine is cool and when u drive it the fuel lines are really cold of fuel and the intake manifold, tb, head are mainly cooler then the block to begin with.This is where you get that good pull and good take offs etc. I believe this is where the ecu is in the works as far as having the fast Idle control in play. once everything is heated up to normal temp the car will fall down to its original state as yours which is probably normal. I do get the same thing too on my tired 317k miles now.