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2009 V6 4 CYL hesitation

  • Thread starter Thread starter valeriefaye
  • Start date Start date Jun 20, 2011
V

valeriefaye

New Member
Jun 20, 2011
1
0
0
Jun 20, 2011
#1
  • Jun 20, 2011
  • #1
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

Active Member
Oct 25, 2010
508
37
29
Dearborn, MI
Jun 21, 2011
#2
  • Jun 21, 2011
  • #2
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

10 Year Member
Nov 5, 2006
2,517
61
89
Long Island NY
Jun 21, 2011
#3
  • Jun 21, 2011
  • #3
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.
 
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