I have a 1994 Ford Thunderbird LX. I recently replaced the Mass air flow
sensor due to my old one failing. now when i am going up a hill, sometimes
(not all the time) my tachometer stays around 1000-1100 ... and i here this
grinding noise from the engine.... i push the gas pedal down about an inch
and the sound goes away and the rpms go up. sometimes it even does this on a
does anybody have any ideas of what it could be? ... anyone ever have this
Depends on what the sound is. Is it a grinding sound, or is it more of a
humming noise (IOW, is the frequency high or low)? If it's a humming
sound, like that you hear from an electric pump, then it may be the fuel
pressure regulator. Had it happen on a 98 Explorer. Only happened at
idle or just off idle, and the noise was very intermittent at first. Can
you better describe the sound (when it does it, what makes it always do
it, when does it stop) as detailed as you can.
I'll take a stab in the dark. I'll suspect the transmission is not unlocking the
converter and shifting into 3rd. The noise is engine lug or maybe even converter
shutter. By depressing the throttle, the processor sees you are demanding more
torque and unlocks the converter and shifts to 3rd, problem goes away.
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