my engine computer wont display MPH from obd2 port

[jacobh704]

i was trying to maximize my fuel economy so i got a PLX kiwi MPG computer... i opened it up plugged it in and it would read all parameters except for my MPH! after a call to the company and a test in my wifes car my truck is the problem!! can anyone clue me in as to what could be the issue??????? anything would help me at this point

 

[Snowboi]

Did the company list it will display all fields in the discription for your truck? What other car did you try it on?

 

[gavin]

the '97 won't display some of the real-time stats that 98+ do.

or atleast earlier 97's.

 

[Scout3]

Like Gavin said. Software problem with code readers for 97's. Nothing wrong with you OBD2 port. Send the reader back.

Ed

 

[jacobh704]

Thanks yall definitely getting my money back it works in everyone elses ford just not mine

 

[gavin]

as I said, that may be a parameter that is not viewable from an early '97.

For example, you cannot reprogram the ECM if you change tire size or gear ratio in a '97.
You can on a '98 though, I believe.

It may be a limitation on the early '97 and earlier OBD2 ECM.

Another example, on my '97 I cannot view misfire readings. I can on my parents 2000 Blazer and 2001 Silverado, real-time misfire readings even.