Engine Stalls and Air Conditioning

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City
Matawan
State
NJ
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United States
What I Drive
2011 Ford Fiesta SE
#1
Hi Everyone- apologies if this is in a previous thread but I could not find the specific problem. My 2011 Fiesta SE Hatchback stalls out from time to time when I am slowing own to a stop, or when I have already stopped at a light. This problem only seems to occur when I have the air conditioning on and it is a hotter day. Now, I have a single code for an oxygen sensor not working properly (I am in the middle of fixing that but having a heck of a time freeing up the factory O2 sensor... I am not a particularly strong person and I do not often do this type of work so my coordination is not great for this type of work).
The other day, the car did not shut off, but as I was driving I lost all power, the pedal goes straight to the floor and the engine BARELY revved. Could the O2 sensor be the only problem there? I have no other codes, but it seems like something is just off. Any ideas?
 
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Grass Lake
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MI
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#2
I think the first thing to inspect is the air filter box. Are all the hoses tightly attached? Are there any cracks or splitting in them that might cause a vacuum leak?
Then I would look at the air filter element and the airflow meter in lid of the air box. Then If all that looks good, I would move to the throttle body and check out how gummed up or clean it is.
The upstream O2 sensor is not always a culprit in stalling issues. But, if it doesn't react to air/fuel ratio changes you would get a MIL lamp. My opinions are based on the information you provided. Once we get above 75k many strange things can happen. Many of them are electrical in nature.
 
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Messages
4
Likes
1
City
Matawan
State
NJ
Country
United States
What I Drive
2011 Ford Fiesta SE
Thread Starter #3
I think the first thing to inspect is the air filter box. Are all the hoses tightly attached? Are there any cracks or splitting in them that might cause a vacuum leak?
Then I would look at the air filter element and the airflow meter in lid of the air box. Then If all that looks good, I would move to the throttle body and check out how gummed up or clean it is.
The upstream O2 sensor is not always a culprit in stalling issues. But, if it doesn't react to air/fuel ratio changes you would get a MIL lamp. My opinions are based on the information you provided. Once we get above 75k many strange things can happen. Many of them are electrical in nature.
Thank you for the advice and tips- I will check all of those immediately. I could not get the O2 sensor out so I am actually taking the car in to have my mechanic take care of it for me- kills me to have to turn the car over but other than tires I've never had to have anyone else work on the car since I bought it in 2012.
 
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Messages
4
Likes
1
City
Matawan
State
NJ
Country
United States
What I Drive
2011 Ford Fiesta SE
Thread Starter #4
I just had a terrible time with the car! Ugh, this is rough. I got two new codes pop up- P0068 MAP/MAF Throttle Position Correlation, and U0101 Lost Communication with TCM. Any thoughts?
Can I just clean the MAF sensor for the first one? Rough time for this to go down!
 
Messages
382
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City
Grass Lake
State
MI
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United States
#5
Hi. I don't understand why the TCM communication fail. Maybe a bad ground?
This image of the MAF harness is where I would be looking first. Broken wires, or connector not seated?
The TPS correlation code would explain the "no power even though the go pedal is on the floor" issue. It could be a failed TPS or it could be a failed ground to the TPS.
You need to get it to a mechanic.
 

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