dead spot on pull out
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Member
Joined: May 2005
Posts: 34
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From: Hawaii
dead spot on pull out
hey guys, my 2000 f-150 4x4 5.4L has a dead spot on pull out. it's slow to pull out, and once in a while it hits a dead spot rpm drops to almost idle then all of a sudden jumps up tp 3000 and goes. i changed fuel filter, ran injector cleaner through gas. same thing. could it be the throttle positioning sensor? and if so should it be changed or cleaned? i'm kinda new to messing with this truck, my other truck was a 1979 f-150 where i clould sit in the engine compartment to change plugs haha. thanks for the replies.
Senior Member
Joined: Mar 2005
Posts: 171
Likes: 0
From: Saint Augustine FL
Could be the IAC
Sounds like It could be the Idle Air Control Valve. I had to replace it on my truck at around 70,000 Miles.
It lets air into the intake, and if it doesn't let enough air through. The Truck doesn't have enough RPM's to stay on.
It is posissioned below the passenger side windwiper base. A small Grey Box.
Mine would idle low, then you could try again, or sit and wait. And sometimes it would automatically fix itself and return to normal RPM's.
It is a $40 part at Autozone or Discount. And under an hour install.
If you need pictures on where it is, E-mail me at. Gothicrainbow1989@yahoo.com
It lets air into the intake, and if it doesn't let enough air through. The Truck doesn't have enough RPM's to stay on.
It is posissioned below the passenger side windwiper base. A small Grey Box.
Mine would idle low, then you could try again, or sit and wait. And sometimes it would automatically fix itself and return to normal RPM's.
It is a $40 part at Autozone or Discount. And under an hour install.
If you need pictures on where it is, E-mail me at. Gothicrainbow1989@yahoo.com
Senior Member
Joined: Jul 2004
Posts: 6,200
Likes: 39
From: Easton, Pa.
Ott to re-think this.
The throttle plate is already open to pass much more air than than IAC.
Better look at the TPS. This is the signal to the PCM for how far the throttle plate is open to match the airflow through the Mass Air meter and determine how much fuel is to be injected.
The rise to 3000 after the hesitation is about the point the engine would normally rev to under these conditions.
It's somewhere in this chain of events.
The throttle plate is already open to pass much more air than than IAC.
Better look at the TPS. This is the signal to the PCM for how far the throttle plate is open to match the airflow through the Mass Air meter and determine how much fuel is to be injected.
The rise to 3000 after the hesitation is about the point the engine would normally rev to under these conditions.
It's somewhere in this chain of events.
Whereabouts
