The car is a 3.0 V6 with auto trans, has about 120k on it now, and was
scrupulously maintained by the previous owner. We've had it for about
6 months, during which time it has functioned flawlessly. In the last
month or so I have noticed that at low to mid throttle demand the car
seems to "buck", and it feels like the transmission is disengaging
then re-engaging. Increasing the throttle demand alleviates the
problem. I may be imagining it, but I think it is worse when the
weather is cold.
Any suggestions or opinions on what the problem may be are
appreciated. Thanks in advance to all.
might be an axle... i had the same proiblem with mine... replaced the
front half axle and bam problem solved...
mantience has not that much to do with it.... how would you feel with
ever have the transmission service done?
I've broken CV joints before; it doesn't feel like that to me. I had
an old Chevy wagon a while back with a bad throttle valve cable- it
kept "hunting" for which gear it should be in...or a standard
transmission if you jabbed your foot onto the clutch pedal a couple of
times while you were driving down the road.....that's a lot like what
this car feels like it's doing, shifting in and out of gear at low
throttle demand conditions. Other than that there is no vibration or
"clunking", which all the bad CV joints I've experinenced did before
My plan at this point is to do the cheap, easy stuff and change the
filter and fluid (the level seems fine, but I've wondered if it's
experiencing a temporary drop in fluid pressure due to a clogged
filter or dirty fluid). Does this model have a modulator-type valve
that reads engine vacuum? Seems to me a low throttle demand might
result in a vacuum variance, which a dodgy modulator might
As for the transmission servicing, I haven't gone through all the
maintenance records to see, but the previous owner religiously
followed the manufacturers specs for regular maint., and took it to
the dealership every single time (they soaked him for a couple of
hundred every trip, too). I'd guess that whatever should have been
done to it was.
My vote is for the TPS - Throttle Position Sensor. Classic symptom at
partial throttle, ECM engaging/disengaging the TCC (40-55 Mph with a
variable light load) thinking the throttle is doing a TIP In/Out.
Ok, at the risk of sounding stupid, could you spell out the acronyms
you used- ECM, ECC, TIP? I'm less convinced now that there is a
transmission problem, but I still don't have a lot to go on. This is
my very first Ford, and without a lot of time or money to go hunting
the problem, I'd like to narrow down the list of suspects as much as
Thanks in advance,
On Sat, 21 Feb 2004 13:41:57 -0500, "Trainfan1"
A Ford does not operate any different from any other make, so if your a "Chevy
guy" the basics are the same.
ECM: engine computer
ECC: Where did you get that?
TIP: as explained in some one else's post when he used the acronym, Throttle tip
in/out ( a very light small amount of throttle change in any direction.)
Hold constant speed with your right foot on the gas. Very lightly,
engage the brake with your left foot. If the symptom is alleviated it
may likely be a fault with the lock-up torque converter if so
Have you had the computer codes read?
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