Instant milage per gallon stopped working in my dash, how do I repair this?

1996 LINCOLN CONTINENTAL
85,000 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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KEN52
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Recently my instant milage per gallon stopped working in my dash. (I recently had a heater core replaced). How would I fix this issue without buying a new dash? It doesn't work on metric also.
This is an original milage Town Car Executive.
May 27, 2023 at 5:26 PM
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JACOBANDNICKOLAS
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Hi,

Have you inspected the wiring to the circuit? Also, are there any other issues that resulted from the heater core being replaced?

Let me know if there are any other issues. For example, if there is an ABS sensor light on, that could be preventing the computer from calculating MPG. It's a theory. However, since the heater core was replaced, I feel it is likely a loose wire at the dash.

Let me know.

joe
May 29, 2023 at 8:38 PM
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KEN52
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Hi Joe, thanks for responding. I'm working with my local mechanic now and the car goes into the shop next week.
That s the only issue I have. The milage will work somewhat for a few minutes then it rolls up to 99 and stops. the metric stops on 2 the goes to 99 the same. thanks
May 31, 2023 at 10:11 AM
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JACOBANDNICKOLAS
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Hi,

Sounds good. If possible, could you let me know what is found? I'm interested in knowing.

Let me know.

Joe
May 31, 2023 at 9:50 PM
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KEN52
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The local mechanic was unable to repair this, cannot isolate part to replace.
will do some more research online. Take care Ken.
Jun 15, 2023 at 2:36 AM
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JACOBANDNICKOLAS
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Hi,

Thanks for the update. Electrical issues can be such a headache. You indicated this happened after the heater core was replaced. I suspect the wiring under the dash was disrupted. It could be a ground wire that was disconnected.

Let me know if you find anything or if you have questions.

Take care,

Joe
Jun 15, 2023 at 10:45 PM
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KEN52
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The local mechanic ran through all the checks and couldn't find anything, so he quit working on it, hopefully I hear something sometime. thanks
Jun 16, 2023 at 12:16 AM
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JACOBANDNICKOLAS
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Hi,

Do you have a shop near you that deals specifically with auto electric issues?

Joe
Jun 16, 2023 at 7:33 PM
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KEN52
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no, we don't. small coastal town mostly log trucks and fishing boats.
Jun 16, 2023 at 11:27 PM
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JACOBANDNICKOLAS
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Wow, I want to live there. I could enjoy that kind of setting.

Anyway, I don't think it is a component issue. Instead, I suspect it is a wiring issue.

Check behind the message center to make sure the wiring isn't damaged, and the connector is good. I attached a pic below showing the switch connector for your reference.

Let me know. When the heater core was removed, they damaged something.

Joe

See pic below.
Image (Click to enlarge)
Attached Media
Jun 17, 2023 at 9:42 PM