2010 FFH Acceleration lag

[timothyf]

Hi, I have a 2010 FFH with 132K. Is anyone else experiencing what feels to me like turbo lag when accelerating from a dead stop? I know I don't have a turbo (wishful thinking), but there seems to be an acceleration lag in the transmission and/or engine before the car gets up to speed. It seems to be prevalent in the last year or so. Any ideas as to what's causing it or how to fix it? Thanks, Tim

[retka]

Out of curiosity, hold down the brake and accelerator at the same time (like you're brake boosting) and then let off the brake and see if you still get "the lag". There is a certain amount of lag experienced for the car to startup the gas engine from a stop. It could be your idle is also set too high/low. There's a way to reset / retrain the computer to reset the standing idle of the engine when in drive...this could somehow cause a lag or shudder when the gas engine comes on.

[proffitt25]

I just posted more about this and other here.

But I also have this issue and am looking for answers.

 

I'm going to have to go try and answer retka's question about holding brake. I think this helps though, I know when I am about to turn into oncoming traffic from a stop I'll go ahead and have my foot starting in on the gas in expectation of the delay. Is it normal behavior that with my foot on the brake and the gas pedal on the floor the engine only idles very low? Any normal ICE car would rev the engine all the way up. But the fusion does not, at least now, and I don't know if that's a symptom or by design.

[murphy]

The gas pedal is not connected to the engine. It is connected to the computer and tells the computer what you want. The computer determines what is going to happen. Most likely the engine is driving the generator and not the wheels. The electric motor is driving the wheels.

[sean.browne1994]

I have been having the same problem. The problem has become more persistent over the past year. I'm not sure, but I think it may be worse on colder days. Anyone else experience that?

[Automate]

Yes, just as EV power goes down when it is colder, the acceleration power also is less and therefore the lag is greater.

[proffitt25]

I agree about the cold exacerbating the problem. When I took my car in to have them check it out, that was how I reported it-- on a cold morning, it seems to take forever to get going again after a stop.

 

I don't know if ultimately there are several problems, but I feel like I'm boiling my biggest one down to either aged batteries that don't have the power to get me going or some kind of computer malfunction that makes it *think* I have aged batteries. I mean, I suppose even with a pretty dead HV battery, slamming the accelerator should kick that ICE on full blast and get me moving, independent.. but maybe it's related.

 

Again, ultimately the dealership was no use and just took my $ for their diagnostic fee.

[paulbuck]

I've noticed this problem in my 2010 FFH since the day I bought it; the only time it is something other than just annoying is when I'm trying to merge into heavy freeway traffic, I floor the accelerator and nothing happens for a few seconds. I've learned to adjust for it, but it's one of the few things about my hybrid that I hate.

Trading it in for a 2020 Subaru Legacy in September; would have gone with another Fusion, but Ford put me off with the 'dial' transmission selector. Sorry, Ford.

[Denny Crane, Esq.]

Definitely seems related to the cold, especially when below 50 degrees. I came to this forum trying to find a solution to the problem (or at least the cause) and will check back.

[lolder]

On 2/8/2020 at 7:14 PM, Denny Crane, Esq. said:

Definitely seems related to the cold, especially when below 50 degrees. I came to this forum trying to find a solution to the problem (or at least the cause) and will check back.

Read this thread: https://www.fordfusionforum.com/topic/19361-my-instructions-on-restoring-the-hybrid-ev-function-on-the-ford-fusion-hybrid-approaching-the-89-years-mark/

[Happy hybrid]

My 2011 Ford Fusion Hybrid also had some significant lag when accelerating from stopped, I also noticed a drop in mpg’s.  I found a Ford TSB for the 2010-2012 Ford Fusion Hybrid/Mercury Milan - Ford TSB #TSB 20-2142.  This instructs the dealer to reprogram the battery energy control module (becm) and the power control module (pcm).  I though we had a throttle body issue (it was cleaned but didn’t significantly help) but after having the reprogramming done the acceleration lag & mpg are greatly improved.  This was a less than $150 fix. 

[Happy hybrid]

My 2011 Ford Fusion Hybrid also had some significant lag when accelerating from stopped, I also noticed a drop in mpg’s.  I found an April 2020 Ford TSB for the 2010-2012 Ford Fusion Hybrid/Mercury Milan - Ford TSB #TSB 20-2142.  This calls for reprogramming the battery energy control module (becm) and the power control module (pcm).  I was hoping this would help the mpg.  I thought the acceleration lag was due to a throttle body issue (it was cleaned but didn’t significantly help) but after having the reprogramming done, our Fusion’s acceleration lag & mpg have improved.  The reprogramming cost $140.  If you’re going to have this done, take the TSB # with you, the dealership had a hard time finding the info on this.