After about 20 minutes or so my 08' F-250 acts like it disengages the transmission but the motor sounds like its running fine and revs up normally, but will go in and out at around 40 mph. Then after the truck sits for a while then it will run again fine for another 20 minutes.
Check the radiator fluid level and top up if needed.
Check the gearbox oil level and for signs of discolouration. Replace if needed.
SOURCE: after driving for 15 minutes truck stalls,restarts
put a OBD II code reader on it see if it has stored any codes if not replace the TPS sensor and the MAF sensor do the replacements at different times so you don't buy one or the other for nothing
SOURCE: After driving for an hour
I had the same issues for most of last summer. Finally, I replaced the Plug Wires and the car has been working like a charm since. The other problem I found was that I had the wrong plugs. It seems there are only two types for the Focus, the local parts guys quoted me the incorrect part number and my fuel efficiency went to ****.
Bryan
SOURCE: 1995 Ford Contour GL, 4-Liter transmission problems
check the transmission fluid level first and also when was last time you had a tranny service new fluid and filter because the screen could be plugged and not allowing the fluid to get to the torque converter also have the catalytic converter checked out
SOURCE: 92 ford explorer. runs great. replaced vaccum
Sounds like the filter in the trans is plugged up. Should flush trans every 45,000 miles and replace filter and fulid. Its easier to take it in to a shop and have it done they use high pressure flush which will clean out the whole thing for about $200.
SOURCE: 2006 expedition knocks at 40-45 MPH
Toss a couple cans of engine medic into your gas tank and I bet you will solve alot of your problem
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