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I have a 02 SVT, that just hit 77k. About 10,000 miles ago i was getting some crazy hesitation and jerking around 2800-3200rpm (at any speed, and didn't seem to occur worse or better at any particular speed ban) I replaced everything i could afford in the way of fuel and spark (plugs and wires, altentor, ignition coil, and fuel filter)--same problem. so after visiting some forums i discovered a common problem with the MAF that could be fixed with a computer update at the dealer..dealer flashed it and tada! no more problem! well about 500 miles ago, the problem seems to be returning. this time the jerks are not nearly as noticable, or consistent (before it would ALWAYS do it) it also seems to happen at a slightly lower range of rpms (2600-3000k) so really i'm not sure if it is the same problem; I love this car and hate to give up on it--it's the first car i have ever bought myself and i own it!--but i cannot afford to pay $100 at the dealer every 8-10k miles; or to keep playing trial and error with the replacment parts...i have again! replaced the plugs and wires and fuel filter...no better.

does anyone have any idea what this could be? if it is the computer again, should the dealer have to flash it again for free since it's been such a short time? will it continue to reoccur? please help--the dealer has been no help, they "can't find anything wrong"
 

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I would contact the dealer if it's not been too long. Sometimes the reflashes are quirky. Give them a call. Quit replacing parts until you find out the real problem. By the way, how old is your air filter. Maybe you're not getting air through to the mass air flow sensor or something. Remember anything mechanical can be fixed. I hope this helped. Drop a post and let me know how it turns out.
 

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The Librarian
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You might keep an eye on the following thread and it's outcome:
http://www.focusfanatics.com/forum/showthread.php?t=176925

I agree with the above poster about not throwing parts at it when you don't know what's wrong.
If you have to use a Dealer (diagnostic equipment) you might try a different one if your current choice isn't fixing the problem to your satisfaction.

The first thing you can try (free [:D]) is resetting the ECU.
Disconnect the battery for 15-20 minutes.
Reconnect the battery, and then start the car up.
^^^IMPORTANT- don't touch the gas or turn on any accessories after starting it.
Let it idle for 5 minutes, then, drive the car normally.
With any luck, this simple reset will smooth things out for you.
 

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You might keep an eye on the following thread and it's outcome:
http://www.focusfanatics.com/forum/showthread.php?t=176925

I agree with the above poster about not throwing parts at it when you don't know what's wrong.
If you have to use a Dealer (diagnostic equipment) you might try a different one if your current choice isn't fixing the problem to your satisfaction.

The first thing you can try (free [:D]) is resetting the ECU.
Disconnect the battery for 15-20 minutes.
Reconnect the battery, and then start the car up.
^^^IMPORTANT- don't touch the gas or turn on any accessories after starting it.
Let it idle for 5 minutes, then, drive the car normally.
With any luck, this simple reset will smooth things out for you.

i posted that thread the other day, im going to my dealer on saturday, getting the PCM reflash done under my 8/80 warranty, and i will post when i get home because i hate the hessitation between 2500 and 3200 rpm, and if it fixes. i recommend it, if it dont fix it, ill let you all know.
 

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i had some jerking down low about a year ago and i changed wires pplugs air filter fuel filter i had a broken clamp that went around my throttle body that covered the intke tube which was broken so i was gettng air to go straight into teh throttle body w/o going by the MAF so it screwed up new clamp no more jerking
 
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