2009 V6 4 CYL hesitation

[valeriefaye]

It should say 4.0L. Oops.

Very frustrated as you can tell by my typing in the subject head.

2009 Mustang hesitating after being driven for at least an hour on the interstate. It will start hesitating after driving an hour or so on the interstate while going up inclines (whether on cruise or not). It will hesitate once off the interstate and after stopping and starting to accelerate again.

It basically hesitates upon acceleration after an hour plus of driving. Today it did fine all the way home, even off the interstate until I got about 2 miles from my house.

We have replaced the Fuel Rail Pressure Sensor due to having read codes P0191 and P0171 off of our home diagnostic code reader.

We have not yet replaced the fuel filter but are planning to do so in the next few days.

Can someone please help? Thanks!

 

[FordCustSrvc]

Hi valeriefaye,

I'm sure the hesitation must be frustrating! Has it been diagnosed at the dealer? Since the fuel sensor did not resolve it, I suggest having them take a look. They are in the best position to determine why it is hesitating. Please PM me with your VIN, contact information, mileage, and servicing dealer information. I would like to assist.

~Natasha

 

[SpartaPerformance]

You need it diagnosed, reading codes doesn't mean squat as you find out, if it were that easy anybody could be a tech. Many issues can cause your symptoms and those codes.