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Hesitation under light throttle acceleration.

2003 Ford Expedition with 4.6L has hesitation under light throttle acceleration in top gear (O/D) from 45 mph - 50 mph (1000 - 1200 RPM. Problem disappears with heavier throttle or manual downshift out of O/D. No diagnosis codes. Last smog test showed very low emissions...possibly suggesting lean mixture. Fuel consumption averages 12.0 - 12.5 MPG in easy city driving.

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  • jay-lifter May 11, 2009

    P.S. In the "olden days"I would just have replaced the accelerator pump plunger.

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Posted on Jan 02, 2017

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SOURCE: excessive fuel consumption

I could recommend a product I use on my own cars called SeaFoam. You can buy it at most autoparts stores like PepBoys and what it does is clean out alot of the carbon buildup, which improves gas milage and gets the engine running like new. Just follow the instructions on the back.

Posted on Aug 29, 2008

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SOURCE: Hesitation when accelerating

Did the EGR valve replacement fix your problem ?

Posted on Sep 09, 2008

  • 85 Answers

SOURCE: losing mpg on 98 4runner

Hello woodmanz,
Thinks that help mpg.
Change air filter, engine needs oxygen.
If using air conditioner, try with it turned off?
Oil change helps if has not been done.
Air in the tires help with mpg.
Tune-up( spark plugs,etc.

Posted on Sep 15, 2008

chuck943
  • 783 Answers

SOURCE: escape will not go above 60mph and will not downshift w/gas pedal

It could very well be a restriction in the exhaust like a stopped up cat converter. I doubt if it is a torque converter,that may make it slow to get to speed but shouldn't effect hwy speeds.
You can check this vehicle for an exhaust restriction very easy by going to the DPFE sensor and measuring exhaust back pressure with a vacuum/pressure gage. It will be either silver or black in color will have 2 rubber hoses hooked to it going down to metal tubes that hook into the exhaust.It will have a 3 wire connector with the color of the wires being BN/WH,BN/LG,OG. Disconnect one of the rubber hoses from the sensor and hook the vacuum/pressure gage into the hose.You should have less than 1 psi at idle,then press accel to wide open throttle and take a reading,it should be no higher than 3-4 psi. Anything more is an exhaust restriction.

Posted on Mar 02, 2009

localwonder
  • 6784 Answers

SOURCE: engine hesitating during acceleration

Ok, there are many issues here that you will need to inspect. I recommend changing the fuel filter and pump as well. this will fix the hesitation. the intake and exhaust manifold gaskets will need to be replaced as well. this will stop the backfiring.

I also recommend checking and running a teat on the PCV valve and inspect the PCV hose as well. it could have a leak or a small crack on it.

Check the air filter and change if needed. this will help with acceleration issues as well. Next, i would run a check on all plugs and the complete wire set as well. change if needed.

Inspect the injectors for leaks and lose wires. make sure they are in good condition. replace any injectors that isn't firing properly.

Ok, there are some sensors that you will need to check as well. i will list them below.

SENSOR CHECK LIST--

1. Check the O2 sensors for worn wires.
2. Check the MAFS(Mas Air Flow Sensors) Check for Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.
3. Check the Air Cleaner Temperature Sensor. this sensor could be damaged ro have loose wires. check accordingly.
4. Check the Throttle Position Sensor. this device could be connected wrong or it may be faulty as well. replace if needed.

Be sure and inspect all the above and repair any problem spot you ruin across during your inspection.

Please rate and god bless:)

Posted on May 06, 2009

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