New to forum, having acceleration problems with 2005 Mustang GT

lukasc · 10-23-2009

Hey everybody.
I bought a used 2005 GT about 2 years ago, it had only 8700 miles on it. Recently I have had some acceleration issues, mostly after driving interstate 70-80 mph. When I get to city driving after the interstate and I attempt to accelerate sometimes even moderately, the car will often cut out mid acceleration. This is happening on a regular basis now. Any idea on what could be causing this hesitation in acceleration? I don't think there is a custom tune or anything, but there is flowmster exhaust that was on the car at purchase. Help!

Back@itagain · 10-23-2009

Welcome to the site and sorry to hear about the headaches. I never experienced this problem but sounds like something similar to what some of the other forum members have posted. This might help for starters.

http://www.allfordmustangs.com/forum...elation-2.html

joeyalex · 10-23-2009

Quote:

Originally Posted by Back@itagain

This might help for starters.

http://www.allfordmustangs.com/forum...elation-2.html

+1, TSB 06-9-9 is most likely the problem. My '06 did the same thing. Had it changed out by the dealer about a month after my warranty was up. (REALLY nice service manager took care of it for me).

Basically, you need to change the fuel pump assembly out. Make sure you get the updated one (Part #7R3Z-9H307-C).

The pump is under the driver's side rear seat. There's a huge rubber plug in the floor, and the pump is underneath that.

jcromer09 · 10-23-2009

welcome to AFM! sorry i don't know what it could be

jgorm · 10-23-2009

any mods or tune?

theuntouchable · 4 Weeks Ago

I had the same problem...

Turned out to be the spark plugs.

MN Mustang · 4 Weeks Ago

+2 on the fuel pump TSB, problems usually show up on the freeway or just after leaving it

rbrowntech · 4 Weeks Ago

Welcome the forums. Lots of good advise here.

chp2150 · 4 Weeks Ago

+1 on the TSB. My 06 was built in early May of 06 and had to have the fuel pump changed out. Your description is a classic indication of the problem.

**stlwagon** · 4 Weeks Ago

And the nice thing is the fuel pump is an easy DIY job.

MN Mustang · 4 Weeks Ago

Just make sure you get that lock ring tight when you are done.The dealership that did mine didnt and the car leaked 5 gallons of gas at the station while filling. Morons!!

the other fiveO · 4 Weeks Ago

Quote:

Originally Posted by stlwagon

And the nice thing is the fuel pump is an easy DIY job.

now may be a good time to upgrade the pumps, GT500's?? STL?

**stlwagon** · 4 Weeks Ago

Quote:

Originally Posted by the other fiveO

now may be a good time to upgrade the pumps, GT500's?? STL?

Only if he had plans down the road that required it.

lukasc · 4 Weeks Ago

I appreciate the good advise. I was thinking about the plugs being the culprit, but a potential fuel pump issue seems like a daunting task for me. I have read about the horror stories of changing plugs too. Also, I don't think there are any mods, but is there any way to check for this? There are many aftermarket parts on the car, Flowmaster exhaust, and some interior dress up components. Bought the car from auction, so I don't know much about it's history.

10/05gt · 4 Weeks Ago

Quote:

Originally Posted by lukasc

I appreciate the good advise. I was thinking about the plugs being the culprit, but a potential fuel pump issue seems like a daunting task for me. I have read about the horror stories of changing plugs too. Also, I don't think there are any mods, but is there any way to check for this? There are many aftermarket parts on the car, Flowmaster exhaust, and some interior dress up components. Bought the car from auction, so I don't know much about it's history.

Hi and welcome to the forums! Were like almost neighbors

+3 on the fuel pump TSB. Changing out the fuel pump isn't a big deal. If you want to save the cash and learn to DIY I will be more than happy to help. Just shoot me out a PM.