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MPG gauge - what are the inputs?

T

tdr1919

Guest
My 86 dash display for MPG is wacky, what are the inputs that are sensed to compute the MPG? and is it all done in the dah cluster?
Thanks,
Tom
 

toptechx6

Well-known member
Joined
Apr 26, 2006
Messages
404
Location
south florida
Corvette
1993 Coupe, Bright Aqua
Usually speed, RPM and pulse width are the inputs, likely computed by the body computer (CCM) after receiving the data from the ECM and finally sent to the cluster. All just conjecture since I don't have 86 specific information, hopefully someone else will know for sure.
 

sriat

Well-known member
Joined
Feb 12, 2006
Messages
82
Location
Kansas
Corvette
1984 Bright Red Coupe
I have an 85 with same problem

Would love to know the answer also!
 
T

tdr1919

Guest
Mine went wacky in my 86. Had to replace the ECM to cure it.
Warp8, on a different thread you were asking about the "shift light" somehow
I believe these two things are use the same information, I wonder if vacuum is also one of the factors?
Tom
 

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