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2.4 liter power with A/C on

7437 Views 20 Replies 11 Participants Last post by  Richard
My car has a serious lack of power with the A/C running. I have the 4 speed trans. It seems like I almost have to floor it from a stop sometimes just to get it going. Is it just the nature of this engine/trans combo?

I haven't driven a 6 speed 4 cylinder. Is it any better? Anyone here with a LS 4 cylinder/4 speed have this issue?

With the A/C off it runs much better so I'm thinking that if I complain to the dealer, they won't or can't do anything about it.

Any thoughts?
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The only time the I4 feels underpowered is from 0-25mph. After that it's fine.
Actually, this is the range where I find it the most powerful. It has excellent pickup for a 4 cylinder. I can burn rubber with half throttle. I find it a bit sluggish at intermediate speeds. If I decelerate to 30 on the highway, then need to re-accelerate back up to 60, I find it to be a little sluggish in this range.
My car has a serious lack of power with the A/C running. I have the 4 speed trans. It seems like I almost have to floor it from a stop sometimes just to get it going. Is it just the nature of this engine/trans combo?

I haven't driven a 6 speed 4 cylinder. Is it any better? Anyone here with a LS 4 cylinder/4 speed have this issue?

With the A/C off it runs much better so I'm thinking that if I complain to the dealer, they won't or can't do anything about it.

Any thoughts?
I have the 4 cylinder with the 6 speed and the air conditioning has no adverse effect on the power at all. The 6 speed does keep the engine in the optimal power band. Also, the 6 speed improves highway gas mileage by about 3 MPG. But I find the 6 speed to be a little temperamental. My biggest complaint is the delay in downshifting which can take 1 -2 seconds when extra power is needed.
Hum, I thought all '10s but fleet cars had the A6.


Anyway, the A6 does help a little due to better gearing, but the A4 is IMO a smoother tranny. The I4 is underpowered for such a size car and that is just the nature of 169 HP in a 3700 pound car.
1. This will change for the 2011 model year. All models will have the A6 for 2011. For 2010, the only model with the A4 is the LS.

2. I agree on all counts. The Malibu is a bigger and heavier car than I originally thought it was. It would have been nice if the Malibu had the same version of the I-4 that the Buick Regal has with Direct Injection and over 180 HP. Also, while the I-4 gets very good gas mileage on the highway, I thought it would do better in stop and go traffic. I get between 13-14 MPG in stop and go driving. I was expecting closer to 17 MPG.
GM is trying to push Buick as a "premium" brand and giving them all the upgraded engines with things like Direct Injection and turbocharging.
I'm not a fan of turbos, but to squeeze some extra HP out of an engine by adding a more sophisticated fuel injection system is a good idea. The truth of the matter is the Malibu is a fairly big and heavy car. If they're going to offer a 4 cylinder, it needs the extra HP that direct injection will supply. In this case, direct injection is not really a luxury. It's a necessity.
I feel my 4 cyl A6 isnt necassarily underpowered, but shifts out of 1st way too quick, takes a weekend to downshift, and seems to "hunt" for the right gear if you let off the throttle for a few seconds and slow down, then get back on the throttle (like taking a corner at speed or something). When you hammer on it, it moves decent for a 3700# car, its just the trans programming (or lack there-of) that really hurts this car. Good thing theres a manual mode, right? :)
You really are spot on with your description of the engine and the transmission. The delay in shifting is most bothersome. The delay is so prominent it's almost a saftey issue. This past week, I needed to change lanes quickly to avoid a car that was moving up fast in the left lane. I hit the gas hard and it took the transmission so long to downshift I barely made it past the car in the left lane. Kind of dangerous.

My first experience with a truly electronic transmission was the 4T80e transmission in the Northstar Engine. You want to talk about a world class transmission - this was it. The downshifts were faster than the blink of an eye. Any the overall quality of the shifts was amazing. The A6 in the Malibu is a highly sophisticated electronic transmission. There's no reason why it doesn't have the responsiveness that the 4T80e had.
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