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sppedometer goes to 120 and odometer counts while in park!! ford t-bird 1991
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zeus
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Jan 17, 2011, 8:09 PM
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sppedometer goes to 120 and odometer counts while in park!! ford t-bird 1991
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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?
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Loren Champlain Sr
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Jan 18, 2011, 6:16 PM
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Re: sppedometer goes to 120 and odometer counts while in park!! ford t-bird 1991
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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
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zeus
New User
Jan 19, 2011, 4:33 AM
Post #3 of 6
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Re: sppedometer goes to 120 and odometer counts while in park!! ford t-bird 1991
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this is a 1991 as well? will it pull codes with no ckeck engine light?
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Hammer Time
Ultimate Carjunky
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Jan 19, 2011, 6:01 AM
Post #4 of 6
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Re: sppedometer goes to 120 and odometer counts while in park!! ford t-bird 1991
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It's possible to have stored codes without a check engine light illuminating but it requires a professional scan tool to retrieve them. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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.
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Loren Champlain Sr
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Jan 19, 2011, 5:48 PM
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Re: sppedometer goes to 120 and odometer counts while in park!! ford t-bird 1991
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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
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zeus
New User
Jan 19, 2011, 9:04 PM
Post #6 of 6
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Re: sppedometer goes to 120 and odometer counts while in park!! ford t-bird 1991
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well, anyway. it never did it again, just that one day. very strange... for now it works.
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