hesitation after 3500rpm at WOT

Garagebuilt01 · December 30th, 2010, 06:45 PM

2002 mustang GT
new parts on the car as of 8/10
JLT cold air intake
Mass air flow sensor
Throttle position sensor
Intake manifold
1 new injector (all new injector o rings)
Fuel rail pressure sensor
all new 02 sensors
fuel pump
fuel filter (less then 500 miles on it)
starter
battery
off road x pipe
sct x3 tuner
etc

so i put in a steeda fuel pump and new fuel filter like 3 months ago..never had any problems. been running great..now all of the sudden if i drive my car for at least 15-20 minutes and i give it full throttle at 3500 rpms and above it cuts out and hesitates..if i back off the throttle a little it will go to redline. its only at 100 percent it hesistates. now i noticed when i put the fuel pump in the filter on the pump really should be facing the other way due to it being so close to the plastic container but i managed to get it to where it look like it would work. idk if i need to buy a new plastic piece for my gas tank or if my pump is going bad or what.. i know if i get in the car after its been off for a while i can get on it and it will do fine. its only after it warms up or ive been driving for 20 min + any ideas?

Garagebuilt01 · December 31st, 2010, 07:34 AM

bump

200440th · December 31st, 2010, 09:56 PM

misfire?

Uberstang1 · January 5th, 2011, 11:32 AM

Doesn't really sound like a fuel pump issue but if you want to double check you need to tap a fuel pressure gauge into the shraeder valve located on the fuel rail and see if it maintains proper fuel pressure at WOT. Is the CEL on by chance? Could be somthing as simple as its time to change the spark plugs.

Willy Mo · January 5th, 2011, 11:53 AM

Has it been tuned? or are you using a canned tune? also may want to check the o2 sensors. If it only does it in open loop (cold) it could be your o2's.

Garagebuilt01 · January 23rd, 2011, 08:29 PM

02 sensors are brand new, no cel's. it is not tuned just running a base map. reason why i say its a fuel pump issue is it did it once before. then i put in my steeda fuel pump and it stopped for about 4 months..then it started back again. only thing i noticed was when i put the pump in the fuel pump assembly the filter looked like it was gonna be pinched a little. (why do they make it complicated and have to have a big thing for the fuel pump to go in? why cant it just sit in the tank?) im thinking about trying to get a new fuel pump assembly and putting my fuel pump in it to see if it fixes the problem..

Smoothgrandmama · January 23rd, 2011, 08:39 PM

Sounds like plugs...

Garagebuilt01 · January 23rd, 2011, 10:22 PM

plugs will do it after 20 minutes and then after you shut the car off and turn it right back on its ok for another little while? i think restarting the car is re priming the fuel pump and it allows it to work for a little while...

Willy Mo · January 25th, 2011, 04:54 PM

dripping injectors? try some fuel system cleaner?

Garagebuilt01 · January 26th, 2011, 02:41 PM

injector o rings are all new and not leaking.. and i used fuel injector cleaner already.. like it said it has to be something electrical or the fuel pump is burning out after so many minutes of useage.. like its kinda kinked and when it primes fuel is iffecient and after a few WOT pulls and about 10-20 min of driving its not supplying enough fuel. ive had this problem before..replaced my stock fuel pump with a steeda and it was fixed for about 4 months and now its doing it again. im thinking it might be the fuel pump assebly or something.. i wish there was a way to just have the fuel pump in the open and just sit in the tank to see if this fixes it.

Garagebuilt01 · February 1st, 2011, 10:38 AM

well i replaced the whole fuel pump and fuel pump assembly..seemed to have fixed the problem..havent had any problems since..

December 30th, 2010, 06:45 PM	#1
Garagebuilt01 Enthusiast 2002 Mustang Gt Join Date: Dec 2009 Location: Demopolis Alabama Posts: 582 iTrader: 1 reviews	hesitation after 3500rpm at WOT 2002 mustang GT new parts on the car as of 8/10 JLT cold air intake Mass air flow sensor Throttle position sensor Intake manifold 1 new injector (all new injector o rings) Fuel rail pressure sensor all new 02 sensors fuel pump fuel filter (less then 500 miles on it) starter battery off road x pipe sct x3 tuner etc so i put in a steeda fuel pump and new fuel filter like 3 months ago..never had any problems. been running great..now all of the sudden if i drive my car for at least 15-20 minutes and i give it full throttle at 3500 rpms and above it cuts out and hesitates..if i back off the throttle a little it will go to redline. its only at 100 percent it hesistates. now i noticed when i put the fuel pump in the filter on the pump really should be facing the other way due to it being so close to the plastic container but i managed to get it to where it look like it would work. idk if i need to buy a new plastic piece for my gas tank or if my pump is going bad or what.. i know if i get in the car after its been off for a while i can get on it and it will do fine. its only after it warms up or ive been driving for 20 min + any ideas? __________________ like my Garage Built Performance facebook page 7.40@90mph spinning past the 60' on 555R

December 31st, 2010, 07:34 AM	#2
Garagebuilt01 Enthusiast 2002 Mustang Gt Join Date: Dec 2009 Location: Demopolis Alabama Posts: 582 iTrader: 1 reviews	bump __________________ like my Garage Built Performance facebook page 7.40@90mph spinning past the 60' on 555R

December 31st, 2010, 09:56 PM	#3
200440th Regular 2004 40th anniversary GT Join Date: Dec 2010 Location: Cedar Rapids, Iowa Posts: 340 iTrader: 0 reviews	misfire? __________________ 68W Combat Medic...Iowa Army National Guard 2004 40th anniversary GT 5speed

January 5th, 2011, 11:32 AM	#4
Uberstang1 Regular 1997 Mustang GT Join Date: Jan 2011 Location: Wilkes-Barre PA Posts: 71 iTrader: 0 reviews	Doesn't really sound like a fuel pump issue but if you want to double check you need to tap a fuel pressure gauge into the shraeder valve located on the fuel rail and see if it maintains proper fuel pressure at WOT. Is the CEL on by chance? Could be somthing as simple as its time to change the spark plugs. __________________ 97 GT, 4v swap,procharged,longtubes,tubular front suspension, team z rear suspension,4.10s moser 31s, to much to list.

January 5th, 2011, 11:53 AM	#5
Willy Mo MM Fanatic 2002 Mustang GT Join Date: Sep 2008 Location: MO Posts: 4,368 Blog Entries: 1 iTrader: 2 reviews	Has it been tuned? or are you using a canned tune? also may want to check the o2 sensors. If it only does it in open loop (cold) it could be your o2's. __________________

January 23rd, 2011, 08:29 PM	#6
Garagebuilt01 Enthusiast 2002 Mustang Gt Join Date: Dec 2009 Location: Demopolis Alabama Posts: 582 iTrader: 1 reviews	02 sensors are brand new, no cel's. it is not tuned just running a base map. reason why i say its a fuel pump issue is it did it once before. then i put in my steeda fuel pump and it stopped for about 4 months..then it started back again. only thing i noticed was when i put the pump in the fuel pump assembly the filter looked like it was gonna be pinched a little. (why do they make it complicated and have to have a big thing for the fuel pump to go in? why cant it just sit in the tank?) im thinking about trying to get a new fuel pump assembly and putting my fuel pump in it to see if it fixes the problem.. __________________ like my Garage Built Performance facebook page 7.40@90mph spinning past the 60' on 555R

January 23rd, 2011, 08:39 PM	#7
Smoothgrandmama Assistant to the Manager 12 GT 8.46@88 1/8 Join Date: Apr 2007 Location: Willis,Texas Posts: 7,161 iTrader: 6 reviews	Sounds like plugs... __________________ Join The MM Facebook: Modded Mustangs Facebook Vote For Modded Mustangs Ride of the Month Eskimo Brothers To Smooth: Safi, Blitz34, Graystang01, WillTheThrill, Bwal, 101Fng

January 23rd, 2011, 10:22 PM	#8
Garagebuilt01 Enthusiast 2002 Mustang Gt Join Date: Dec 2009 Location: Demopolis Alabama Posts: 582 iTrader: 1 reviews	plugs will do it after 20 minutes and then after you shut the car off and turn it right back on its ok for another little while? i think restarting the car is re priming the fuel pump and it allows it to work for a little while... __________________ like my Garage Built Performance facebook page 7.40@90mph spinning past the 60' on 555R

January 25th, 2011, 04:54 PM	#9
Willy Mo MM Fanatic 2002 Mustang GT Join Date: Sep 2008 Location: MO Posts: 4,368 Blog Entries: 1 iTrader: 2 reviews	dripping injectors? try some fuel system cleaner? __________________

January 26th, 2011, 02:41 PM	#10
Garagebuilt01 Enthusiast 2002 Mustang Gt Join Date: Dec 2009 Location: Demopolis Alabama Posts: 582 iTrader: 1 reviews	injector o rings are all new and not leaking.. and i used fuel injector cleaner already.. like it said it has to be something electrical or the fuel pump is burning out after so many minutes of useage.. like its kinda kinked and when it primes fuel is iffecient and after a few WOT pulls and about 10-20 min of driving its not supplying enough fuel. ive had this problem before..replaced my stock fuel pump with a steeda and it was fixed for about 4 months and now its doing it again. im thinking it might be the fuel pump assebly or something.. i wish there was a way to just have the fuel pump in the open and just sit in the tank to see if this fixes it. __________________ like my Garage Built Performance facebook page 7.40@90mph spinning past the 60' on 555R

February 1st, 2011, 10:38 AM	#11
Garagebuilt01 Enthusiast 2002 Mustang Gt Join Date: Dec 2009 Location: Demopolis Alabama Posts: 582 iTrader: 1 reviews	well i replaced the whole fuel pump and fuel pump assembly..seemed to have fixed the problem..havent had any problems since.. __________________ like my Garage Built Performance facebook page 7.40@90mph spinning past the 60' on 555R

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