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sppedometer goes to 120 and odometer counts while in park!! ford t-bird 1991


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zeus
New User

Jan 17, 2011, 8:09 PM

Post #1 of 6 (1579 views)
sppedometer goes to 120 and odometer counts while in park!! ford t-bird 1991 Sign In

this just started tonight, the odometer counts while in park, and the speeo reads 120. while driving the speedomoter is'nt THAT crazy but deifantately is not accurate. no engine sputtering or rpm fluctuation. also no check engine light. how is this possible? i thought the odometer was moved mechanically by the wheels...
anyway is it safe to drive?


Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Jan 18, 2011, 6:16 PM

Post #2 of 6 (1568 views)
Re: sppedometer goes to 120 and odometer counts while in park!! ford t-bird 1991 Sign In

The T-Bird uses a Vehicle Speed Sensor (VSS), not a cable. Although I don't recall seeing this symptom from a VSS, I'd start by having the trouble codes pulled. Again, unsure if OBD I has that capability, but is where I'd start. Will usually cause eratic transmission shifts, as well, which would be the main concern.
Loren
SW Washington


zeus
New User

Jan 19, 2011, 4:33 AM

Post #3 of 6 (1559 views)
Re: sppedometer goes to 120 and odometer counts while in park!! ford t-bird 1991 Sign In

this is a 1991 as well?
will it pull codes with no ckeck engine light?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 19, 2011, 6:01 AM

Post #4 of 6 (1557 views)
Re: sppedometer goes to 120 and odometer counts while in park!! ford t-bird 1991 Sign In

It's possible to have stored codes without a check engine light illuminating but it requires a professional scan tool to retrieve them.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Jan 19, 2011, 5:48 PM

Post #5 of 6 (1549 views)
Re: sppedometer goes to 120 and odometer counts while in park!! ford t-bird 1991 Sign In

Having an old phart's memory....all domestic passenger vehicles began having onboard computers starting with the 1981 model year? Prior to '96, the check engine or service soon light would only illuminate with a hard fault. Hopefully, someone with a better memory will jump in, here?
Loren
SW Washington


zeus
New User

Jan 19, 2011, 9:04 PM

Post #6 of 6 (1545 views)
Re: sppedometer goes to 120 and odometer counts while in park!! ford t-bird 1991 Sign In

well, anyway. it never did it again, just that one day. very strange...
for now it works.






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