1993 4.0 hesitation until full throttle

Discussion in '1993 - 1997 Ford Ranger' started by john tyson, Mar 10, 2020.

  1. john tyson

    john tyson New Member

    I have a manual 4.0 ranger without egr. Dang truck idles good, no vacuum leaks. New wires and plugs. When I take off cold, the truck seems to bog down until I punch the throttle then it comes to life. After driving a couple of miles it's fine. No engine codes
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  3. RangerAl

    RangerAl Member

    Clean your MAS (sensor right next to the air box) and replace you idler air control, the cylinder thing on the throttle body.
  4. OP
    john tyson

    john tyson New Member

    I did replace both. Runs alot better now, but I know have fuel pressure issues. After sitting a while, I have to crank a few times before it stays running. Fuel pump is running but pressure is low for the first couple of key cycles. Will be changing pump this week. Also replacing rotten fuel filler hose.
  5. RangerAl

    RangerAl Member

    Just a simple trick I learned, remove 6 bolts holding the bed to the frame and lift the bed and use a jack to lift the bed up just enough to remove the fuel pump. Don't forget the filter (fuel filter) need to be replace.
  6. OP
    john tyson

    john tyson New Member

    Thanks. I have an overhead wench in my shop roof. Never had good luck with Fords or fuel pumps.

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