Transmission problem

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Mar 19, 2013 | 05:34 PM

rooster159

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Transmission problem

New to this site, hoping someone can help us. Just bought a 2005 F150 supercrew 5.4 3v. It drove fine during the test drive, the motor was just a little rough. My husband put a little fuel treatment in, and it smoothed out. We put about 100 miles on it and it started acting up. When you take off from a stop, it gets to about 35 mph and suddenly upshifts, then downshifts back and forth rapidly. Then if you let off the gas, it quits. It drives normal after that. This has happened several times. Anybody else have this problem? Any ideas what is wrong? Or did we buy a lemon? My husband loves this truck, he's hoping it is something simple.
Thanks,
James & Sue

Mar 20, 2013 | 11:27 AM

70f100longbed

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From: Raleigh USA

Are you sure it is shifting rapidly? The Rpms will jump up and down if it was. It almost sounds like you have a misfire. Cancel overdrive and see if it still does it.

Mar 21, 2013 | 09:01 AM

tooldad

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Does sound similar to some misfire symptoms.

Mar 21, 2013 | 11:34 AM

1979 Ford

Cargo Master

Joined: Jul 2005

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From: Not as far west as I want

I am guessing a misfire. Which I'd venture to guess it is a coil pack. If so the fix is easy and lot cheaper then a transmission.

Mar 22, 2013 | 03:39 AM

rooster159

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misfire I would of never gess that.no the rpms not jumping. i'll get plugs and coil pack
put on it thank you.

Mar 22, 2013 | 09:15 AM

1979 Ford

Cargo Master

Joined: Jul 2005

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From: Not as far west as I want

Check the codes first so you're not hanging parts. The codes should be pretty specific.

Mar 22, 2013 | 01:32 PM

rooster159

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Any suggestions as to where to take the truck to get the codes, other than dealer which will prob. charge an arm & a leg?
thks,
Sue

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Mar 22, 2013 | 10:30 PM

70f100longbed

Fleet Mechanic

Joined: Aug 2002

Posts: 1,899

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From: Raleigh USA

Don't write off the dealer so quick, Many are competitive with a lot of ind shops. It pays off to call around

Mar 22, 2013 | 10:40 PM

#10

countryboy8085

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I'm not sure where you are, but Midas has surprised me quite a few times lately. Have been in a few times and no problems. Even had the one in Omaha, Nebraska install my exhaust and stack kit. Tell you the truth only reason I went in there is because my wife had to pee and that was the closest place. Ended up with really good service.