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AMEDEE
AMEDEE, ASE Certified Technician
Category: Transmissions
Satisfied Customers: 26229
Experience:  ASE TECH WITH ADVANCED LEVEL CERTIFICATION/L1 CERTIFICATION
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2011 Ford fusion seems to have intermittent acceleration

Customer Question

2011 Ford fusion seems to have intermittent acceleration problem. There is a hesitation when the wrench light comes on the dash. However when key is shut off the wrench light goes away and the car acceleration returns to normal. Can drive for about a 10 minutes or until I go uphill then the problem returns. However once again if key is turned off and removed the system resets and the problem dissapears.
I went to the shop and they want to replace the fuel pump charging me a lot of money, but based in last experiences, I do not want to consider this diagnostic the real problem.
Submitted: 11 months ago.
Category: Transmissions
Expert:  AMEDEE replied 11 months ago.

Hello and welcome!

My name is ***** ***** I can assist you with your question.

Expert:  AMEDEE replied 11 months ago.

Do you happen to know the code number in the computer?

Are you looking for possible causes?

Customer: replied 11 months ago.
I do not have a computer to check it.I want to repair this problem
Expert:  AMEDEE replied 11 months ago.

Got it! The most common cause for this condition is a bad mass air flow sensor or faulty tune up components.

Expert:  AMEDEE replied 11 months ago.

If the fuel pump driver module was not replaced, that could be an issue as well. The fuel pump driver module is a little computer that controls the fuel pump.

Expert:  AMEDEE replied 11 months ago.

Some other less likely possible causes would be the oxygen sensor or if the PCM needs to be updated (programmed to the latest software)

Customer: replied 11 months ago.
from where is the best to start?replace maf sensor? or replace pump computer?
Expert:  AMEDEE replied 11 months ago.

Another possible cause would be the throttle body. This too is very common.

I would get the computer scanned for codes first. The codes will point you in the right direction.

You should be able to get the codes read at your local auto parts store for free.

Expert:  AMEDEE replied 11 months ago.

I am glad I can help!

It has been a pleasure working with you. Please dont forget to honor your good faith deposit by rating my answer as "Excellent Service" for assisting you today.

Please let me know if you have any further questions.

Customer: replied 11 months ago.
if i find the correct code is possible to find the exact cause of the problem?
Expert:  AMEDEE replied 11 months ago.

Once you have the code or codes in the computer, it will point you in the right direction. There are a few possible causes for each code. But it will narrow it down significantly for you.

Customer: replied 11 months ago.
where is located the port for the computer in this vehicle?
Expert:  AMEDEE replied 11 months ago.

Under the dash on the drivers side.

Customer: replied 11 months ago.
ok, please give me 15 minutes to check this.
besides of the light with a wrench, appeared also the check engine light.
Expert:  AMEDEE replied 11 months ago.

YES, that is correct. They can go on at the same time related to the same problem.

Customer: replied 11 months ago.
hello again,
my friend conected the computer and showed this:generic P2111i do not understand but computer display read something "butterfly actuator jammed or open"
Expert:  AMEDEE replied 11 months ago.

Thank you for that information. This code indicates an issue with the throttle body. This is very common.

Here is the definition for this code.

P2111 Throttle Actuator Control System - Stuck Open

Possible Causes

TAC motor circuits are cross-wired
Throttle body is binding or it is stuck open
TAC motor harness circuits are shorted together
PCM has failed

Customer: replied 11 months ago.
oh..so how i could resolve this? just buy the throttle body?
Expert:  AMEDEE replied 11 months ago.

YES, the throttle body will need to be replaced.

Customer: replied 11 months ago.
this is a titatic, skilled labor or i can do it for myself? should be a ford part? or the aftermarket part is fine?
nothing i can do before replace that part?...like lubricate the buttefly with w-40?
Expert:  AMEDEE replied 11 months ago.

While this may cost a few bucks, it is nothing major. It is a simple throttle body. You can do this yourself. It only calls for about .8 of an hour to replace the throttle body. Be sure to get it from the dealer. Here is the part number. 9L8Z9E926A

Expert:  AMEDEE replied 11 months ago.

I am glad I can help!

It has been a pleasure working with you. Please dont forget to honor your good faith deposit by rating my answer as "Excellent Service" for assisting you today.

Please let me know if you have any further questions.

Customer: replied 11 months ago.
i found the part in the auto discount, is that parts work bad?
Expert:  AMEDEE replied 11 months ago.

I am not sure I understand your reply..

Expert:  AMEDEE replied 11 months ago.

If your asking if you can use an aftermarket part, the answer is YES.

However, if it were my vehicle, I would go O.E. (Dealership)

Customer: replied 11 months ago.
now that you are vey familiar with this model, do you know the causes, the floor in the right side front, gets wet when the a/c is working?
Expert:  AMEDEE replied 11 months ago.

This is caused by a plugged evap drain tube.

Customer: replied 11 months ago.
how can i fix this?
Expert:  AMEDEE replied 11 months ago.

By unclogging the drain using a screw driver underneath the vehicle.

I am glad I can help!

It has been a pleasure working with you.

Please dont forget to honor your good faith deposit by rating my answer as "Excellent Service" for assisting you today

Have a great night!

Amedee

Customer: replied 11 months ago.
where is that drain plug located ?
Expert:  AMEDEE replied 11 months ago.

On the firewall