Question about Ford Expedition

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When,2003 ford expedition, under hard excelleration it doesn't, it will excellerate under gradual increase in power. wont tack over 3100 and misses. no miss at IDLE or normal driving

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The first thing i would do is learn the spelling of "accelerate" and then i would call the people that sold me the car or a nearby mechanic to come take a look.

Posted on Nov 18, 2014

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Posted on Jan 02, 2017

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check your timing.. it might be off a little bit, also you may want to check the idle screw adjustment just under the air filter assemly

Posted on Jul 07, 2009

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SOURCE: runs ruff at idle and when excellerating is missing

Good chance that your fuel pressure regulator has gone bad and needs to be replaced. Sorry you have not indicated what year your Jimmy is so going to take a guess it's of the 1996 and above.

You may may have a leaky fuel pressure regulator.
Double check cold start cranking fuel pressure. If under 63-62 lbs you have problems. Run the full fuel pressure test and post back pressures.
Here is the guide lines on testing:
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
Later V6 and V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak.
Post back fuel pressure readings.

The 75-85 is only a check on the capable full pressure of fuel pump.
If you can not find the rubber return line check full pressure by plugging return line or just or the true full pressure can be taken direct at the end fuel filter. What are the pressure readings that you have done. Good luck and be glad to help you get your Jimmy running 100% again.

Posted on Jan 13, 2010

  • 5763 Answers

SOURCE: no power when excellerating and missing

The first thing to look at would be the sparkplug wires, it sounds like you have misfiring under a load, also take a look at the fuel preasure while under a load,start with these things first then we go from there,

Posted on May 30, 2010

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SOURCE: My 2000 f250 5.4 gas motor has a miss and sputters under excelleration. I changed the plugs what else can it be

It's possible the miss and the sputtering are two separate problems. Bad spark plug wires can cause a miss and poor performance. Sputtering may be a fuel delivery problem - anything from a clogged fuel filter to a bad fuel pump or dirty fuel injectors. If your fuel filter has passed its recommended service interval, or if you have heard of bad fuel problems in your area (my area had an incident a couple of months ago), change the filter.
The most efficient way to check the wires is to measure the resistance if you have a multimeter. Radio interference suppression wires should measure approximately 1000 Ohms, with the exact amount depending on length. Metal wires should measure less than 1 Ohm - very little more than you would get if you shorted the two ohmmeter probes together. (If you need more information on using a multimeter to read resistance, I can write that up for you.) Note: check just one wire at a time so there's no chance of mixing up connections. If any wire fails to produce a reading, or it won't read unless you bend it just right, that wire is broken. If any of the spark plug wires has damaged insulation, especially burned spots, change it. (Sometimes you can find bad wires by looking under the hood after dark with no lights present - you may see corona discharge or sparking around the bad spots.)
With the problems you are having, I would be surprised if you did not have your engine service light coming on. Get a readout of the engine computer error codes. This can save a lot of time and money trying hypothetical solutions. (I have listed the most common and simplest items, but there are a number of other things that can cause your problem.)

Posted on Dec 13, 2011

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