This has been my first full winter with the 3.7 V6 and one thing I have noticed is that the car doesn't favor cold weather quite as much. Once the temperature here gets to about 45 to 50 degrees the motor is a lot happier. It runs out more smoothly and overall just performs better. Below that it's almost like the car is holding back. It's not a difference to the point that I think it's a problem but I do notice a slight drop off in performance in the colder temperatures. I am starting to wonder if this is the reason a lot of guys opt for the tuner on this particular engine. I use only 93 octane in mine so I know it's not a fuel issue. It just doesn't much care for really cold air. Have any of you other V6 owners noticed anything similar to this?

 

I don't drive a V6 but the ECU should be smart enough to account for the increased volume of air. Try unplugging your battery hold the brake or something else that would drain the residual power from the ECU, then plug the battery back in. It should do a relearn with the cold air.

 

Worth a shot. I'm wondering if below a certain temperature this is just the way the stock tune performs. It's not a horrible decline in performance by any means but enough so that's its noticeable.

 

I havent driven mine below the 40 deg temp as its a performance package car. but i havent really noticed any difference but i also dont get on it hard too often. i use the middle grade gas

 

Can also be that you're probably driving with the A/C compressor running - that's happening with any HVAC setting besides the panel vent only one, whether you have the A/C button lit up or not, I'm pretty sure.

 

It could be from running the defroster I suppose.

 

I've noticed this on my 5.0 as well. I think a big part of it for mine is the constant temp. change here in Houston. One day its 40, then jumps back up to 75. Then a few days later it will be 40 again. ECU might be having trouble keeping up. I'm going to do the battery reset and see if it helps.

 

'Little Red' (my Mustangs name) runs 'a little bit better' in cold weather. It is true when you run the defrost, the ac runs to remove moisture from the cabin so the windows don't fog up so bad.