2002 Ford Expedition hesitation

Tiny
CHRISA350
  • MEMBER
  • 2002 FORD EXPEDITION
  • V8
  • 2WD
  • AUTOMATIC
  • 86,000 MILES
My 2002 ford expedition 4.6 v8 has a hesitation problem. When at 55-60 Mph and rpm between 1500-2000 it hesitates and jerks. I have not noticed it at any other speeds or rpm range. No problems when driving on city streets or when at highway speeds of about 70 mph or more. I am also not getting any engine codes. My mechanic cleaned the mass airflow sensor and it stopped for about a week, but now the problem is back. Any ideas? Thank you.
Thursday, March 20th, 2008 AT 10:35 PM

4 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Two things I know of that cause it, Mass air flow and EVR which is the egr solinoid.


https://www.2carpros.com/forum/automotive_pictures/62217_EVR_2.jpg

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Friday, March 21st, 2008 AT 6:25 AM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Answer to your PM: The picture shows the part usually responsible, It's called the EVR. Sometimes you can take the top part off, and wash the sponge part in soap and water, dry it out and put it back together. In the picture it's upsidedown!
You may have a vacuum leak, get a can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs!
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Saturday, March 22nd, 2008 AT 5:30 AM
Tiny
JOE6770
  • MEMBER
  • 12 POSTS
I had the same problem with my 2003 f-150. It was 2 boots on the cop's that had a split on them and was causing a miss fire.I replaced all 8 and my truck runs great
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Saturday, March 22nd, 2008 AT 12:19 PM
Tiny
CHRISA350
  • MEMBER
  • 2 POSTS
Hey, my service engine soon light FINALLY came on. I got the code scanned and it turned out to be a misfire on cylinder # 2. I replaced the coil on plug unit and it fixed the whole problem. Hope this helps someone else.
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Saturday, March 29th, 2008 AT 10:30 PM

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