Tranny Trouble
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Tranny Trouble
I have a 1992 Ford F150 Tk. The auto-transmission will not work in forward, but reverse works fine. If i keep it in drive it will then work. Reverse is fine. Transmission does not slip when on the highway. One time today putting it into drive worked fine and reverse didn't work. Could it be the torgue converter acting up? Thanks
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Hi. Im haveing the same problem with my 92 f150. But my tranny will for a little while but it takes about ten seconds before it will start to move. after a while of driving though,{10 minutes{,. Once i come to a stop and try going again it wont move . sure the engine revs up and is working good when gas applied. I have to unhook battery for a minute or two then it works again but only for a bit of time.reverse always works good, can even spin the tires in reverse. If any thing my tranny fluid is to high
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From: Easton,Ks
The TPS sensor can cause the transmission to do this as if the EEC thinks the engine is at idle it will not increase the transmission oil pressure to apply the clutches. Also the TR sensor can give some problems along these lines.
TPS - Throttle Position Sensor
EEC - Electronic Engine Control
TR - Transmission Range Sensor
TPS - Throttle Position Sensor
EEC - Electronic Engine Control
TR - Transmission Range Sensor
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From: Easton,Ks
Before the PCM when a transmission would take a long time to go into gear or not at all at idle and you had to rev it up to get into gear the problem was the seals were bad or the pump/filter was not providing the oil pressure.
This of course was cause by low oil pressure before the PCM.
Now with the PCM you can get the same thing if the PCM does not think you are in gear (TR sensor) or the throttle is closed (TPS sensor) and the PCM will leave the oil pressure in the transmission low causing the same thing as above. Also a bad PCM or wiring would make this happen too.
Not saying this is the problem but it is about the only thing that can do it without going inside the transmission and I can not think of anything inside that would have these symptoms other than bad filter or low oil level and then run fine.
One other possibility is the shift linkage is out of adjustment at the transmission.
This of course was cause by low oil pressure before the PCM.
Now with the PCM you can get the same thing if the PCM does not think you are in gear (TR sensor) or the throttle is closed (TPS sensor) and the PCM will leave the oil pressure in the transmission low causing the same thing as above. Also a bad PCM or wiring would make this happen too.
Not saying this is the problem but it is about the only thing that can do it without going inside the transmission and I can not think of anything inside that would have these symptoms other than bad filter or low oil level and then run fine.
One other possibility is the shift linkage is out of adjustment at the transmission.
Last edited by subford; Oct 31, 2006 at 06:59 AM.
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Lead Driver
Joined: Nov 2002
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From: Concord, NC
so what you're saying is that an electronic automatic won't go into gear unless you press the throttle....kinda like doing neutral drops then? That doesn't make sense to me. What if the screen is clogged like what would happen on a non-electronic automatic?
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From: Easton,Ks
Originally Posted by EPNCSU2006
so what you're saying is that an electronic automatic won't go into gear unless you press the throttle....kinda like doing neutral drops then?
Originally Posted by EPNCSU2006
That doesn't make sense to me. What if the screen is clogged like what would happen on a non-electronic automatic?
Lead Driver
Joined: Nov 2002
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From: Concord, NC
Its not that it is not going into gear but the oil apply pressure is low and the clutches are slipping.
Junior User
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one guy suggested i take off my tranny line to the rad and see if the pump is working. if it is the pump is that an easy thing to change with out removing the trannt. Also if the electronics are fcuked up would that cause my pump not to work ?
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From: Easton,Ks
Originally Posted by EPNCSU2006
so what does that have to do with throttle position? Shouldn't it go into gear whether the throttle is pressed or not?
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From: Easton,Ks
Originally Posted by kbolk
one guy suggested i take off my tranny line to the rad and see if the pump is working. if it is the pump is that an easy thing to change with out removing the trannt. Also if the electronics are fcuked up would that cause my pump not to work ?
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From: Easton,Ks
Originally Posted by kbolk
So if the tps is faulty, what do u do to repair it?
Could be other things inside the transmission like sticking valves in the valve body, worn pump and bad solenoids.