1999 Ford Expedition Logo
Barry Floyd Posted on Mar 18, 2015
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My expedition skips on low acceleration and stops when accelerated hard why

2 Answers

squeely

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  • Ford Master 454 Answers
  • Posted on Apr 02, 2015
squeely
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What you have is one of two things. You have a sparkplug that is bad and or a cop (coil on plug) that is bad. A good way to figure this out is to go to autozone and have them do a code check. Sometimes a " check engine" light will come on and sometimes it wont. My check engine light never came on. It was missing but after aceleration or high rpm the miss would go away. I changed both the cop and spark plug and problem fixed. By the way coil on plugs are expensive. I ordered mine on the internet and saved over 75%. Best wishes and hope this solves your problem.

Edward Garrison

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  • Expert 110 Answers
  • Posted on Mar 29, 2015
Edward Garrison
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I had the same thing. It could be a number of things. Mine was the fuel pump, screen and filter. The pump and screen are located inside the gas tank. The filter is located on tbe drivers side oc the tank under the drivers door

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5 Related Answers

Anonymous

  • 123 Answers
  • Posted on Jan 13, 2009

SOURCE: shaking when accelerating

Check the driveshafts/ Universal joints in the driveline.

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Anonymous

  • 11896 Answers
  • Posted on Mar 04, 2009

SOURCE: 1996 Ford Explorer vibrates when idling. Also...

You have a hesitation. A hesitation is cause be either:
1. bad spark plug
2. bad spark plug wire
3. bad or leaky or plugged injector
4. timing is off
5. leaky vacuum hose

Anonymous

  • 11 Answers
  • Posted on Mar 11, 2009

SOURCE: 2000 ford expedition, misses during acceleration,

check pass side rear plug the coolant hose the runs to the heater core can leak coolant into the rear spark plug boot and cause a miss

Anonymous

  • 1 Answer
  • Posted on Mar 13, 2009

SOURCE: 99 Expedition - Stutters and loses power when accelerating

My was doing the same thing, it was an EGR valve and a misfire on the #2 cylinder which required a new spark plug and a coil pack
t

Anonymous

  • 4 Answers
  • Posted on Mar 18, 2009

SOURCE: misses during acceleration , rough

Go get the codes ran at auto zone or advance auto parts they will do it for free. If the codes come up as a cylinder miss-fire then it is most likely a coil (being a ford). Write down which cylinder it is. I wouldn't replace any of the spark plugs , useless you have more than 100,000 miles. If you have to replace the spark plugs use BOSH double plautim or better. The cylinder placing is ( as your are looking at the front of the truck) passenger side front to back 1-2-3-4 driving side front to back 5-6-7-8. If you never seen a coil buy one so you know what you are looking for. The coil is held in by a 7mm bolt. Take the bolt out and replace the coil. Problem Solved. Estimated time 20 Mins with 60 dollars per coil.

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These details will help.
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Shaking when accelerating

Check the driveshafts/ Universal joints in the driveline.
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