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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

Engine holding back at WOT

  • Thread starter Thread starter mrjucs
  • Start date Start date Jan 15, 2011
M

mrjucs

New Member
Jan 15, 2011
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Jan 15, 2011
#1
  • Jan 15, 2011
  • #1
So when I take off at a light, the engine seems to "hold back" until about 5k rpm. At 5k, it will snap out of it and get to 6500 in no time and it will move your head back when it does this does there is something restricting when i go WOT or rapidly increase the throttle.

I have changed plugs, wires, MAF, PCV, IAC, EGR, and it does need a tune BAD!

I could have walked on a 2010 GT but he got the jump on me cause of this >.< and then when it snaped out of it at 5K I ran even with him and started to claw my way up.

Any ideas?
 

trombonedemon

Well-Known Member
Jun 25, 2009
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U.S.A, U.S.A., U.S.A.!
Jan 15, 2011
#2
  • Jan 15, 2011
  • #2
Maybe, throttle positioning sensor, those are digitial sensors so when the signal flat lines seems like the RMPs will hesitate then jump when the sensor is functioning properly.
 
2

2002BLGT

Well-Known Member
Dec 18, 2003
2,945
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Bedford VA
Jan 17, 2011
#3
  • Jan 17, 2011
  • #3
First post fail
 
M

mrjucs

New Member
Jan 15, 2011
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Jan 18, 2011
#4
  • Jan 18, 2011
  • #4
2002BLGT said:
First post fail
Click to expand...

fail?? So it ended up being the Fuel Pressure Regulator. Its now changed and running great.
 

BurningRubber

10 Year Member
Dec 6, 2004
1,865
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58
Jan 18, 2011
#5
  • Jan 18, 2011
  • #5
What do you have done to the car? 6500RPM is too high if ya don't have cams or springs.
 
M

mrjucs

New Member
Jan 15, 2011
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Jan 18, 2011
#6
  • Jan 18, 2011
  • #6
BurningRubber said:
What do you have done to the car? 6500RPM is too high if ya don't have cams or springs.
Click to expand...

oopps...lol i meant 6k. i didnt even see that..lol
 

BurningRubber

10 Year Member
Dec 6, 2004
1,865
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58
Jan 18, 2011
#7
  • Jan 18, 2011
  • #7
Oh, haha... no problem.
 

GDawg

Founding Member
Mar 22, 2002
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Nevada
Jan 19, 2011
#8
  • Jan 19, 2011
  • #8
How did you determine that it was your regulator?
 
M

mrjucs

New Member
Jan 15, 2011
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Jan 19, 2011
#9
  • Jan 19, 2011
  • #9
GDawg said:
How did you determine that it was your regulator?
Click to expand...

when i pulled the line off there was still fuel in the line and the symptoms where the same that i read online as well...so i went and got a new one with new rails
 
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