wont change gears - Transmission Problems


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wont change gears

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Auto Repair Home>> Automotive Repair>> Transmission Problems

tykie1
Novice

Mar 23, 2009, 4:03 PM

Post #1 of 4 (1961 views)

wont change gears	Sign In

I HAVE A 1990 MERCURY MARQUIS WITH A 5.0L ENG. I HAVE CHANGED THE TRANNY FILTER AND FLUID I HAVE PUT ON A NEW SPEED CONTROL SENSOR AND I CANT FIND A MODULATOR ANY WHERE ON THE TRANNY IS THERE ONE AND WHERE WHOULD IT BE FOUND IF NOT THEN WHAT CAUSES THE TRANNY TO SHIFT EXCEPT FOR THE STEP DOWN

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 24, 2009, 1:49 AM

Post #2 of 4 (1955 views)

Re: wont change gears	Sign In

Not sure what you are asking. Are you saying it just stays in low gear?

T

tykie1
Novice

Mar 24, 2009, 3:55 PM

Post #3 of 4 (1949 views)

Re: wont change gears	Sign In

yes it wont change to a high gear from park i go to drive and then as you drive it should change gears to a higher gear but it stays in what feels like 1st gear

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 24, 2009, 4:16 PM

Post #4 of 4 (1946 views)

Re: wont change gears	Sign In

Did this problem just crop up with the recent work or is that WHY you did the work?

There's a cable linkage at the throttle body with a fairly weak connector that if broken off and pulled could make the car think it's floored all the time. That cable is mechanically sensing throttle position and must be in place. When they break they usually won't downshift but might have jammed up last time the gas pedal was to the floor.

How many miles and has this trans already gone thru an overhaul? It's pushing 20 already and could be on a second or third by now - all depending on use and condition,

T

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