1998 Isuzu Trooper odometer/tripmeter

MICHAEL98837

MEMBER
1998 ISUZU TROOPER
3.5L
V6
AUTOMATIC
194,000 MILES

I drive my vehicle for work 1 way it is 177 miles, where it is parked for awhile till I drive home with it. Using the same route every time. The trip meter shows it being 166 miles. Nothing on vehicle has changed same tires. Each trip

Friday, October 23rd, 2015 AT 9:56 PM

5 Replies

WRENCHTECH

MECHANIC
20,757 POSTS

Are you saying that the return trip shows less miles that the trip out there?

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Saturday, October 24th, 2015 AT 5:27 AM

MICHAEL98837

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3 POSTS

I saying going the same route that is 177 miles the vehicle says it is 166 miles both ways

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Saturday, October 24th, 2015 AT 6:36 AM

WRENCHTECH

MECHANIC
20,757 POSTS

I don't know how you can be so sure that the 177 figure is correct. If you are relying on street signs or maps, you have no idea what points they were measured from.

Just because a sign says it's "X" number of miles to a city, you don't know where in the city that measurement was taken or when.

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Saturday, October 24th, 2015 AT 7:08 AM

MICHAEL98837

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3 POSTS

If you go back to my original post. My 177 mile figure! As by the odometer/trip meter I reset it every trip. Now my trip meter says its 166 miles. Now any mechanical reason why my vehicle is doing this

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Saturday, October 24th, 2015 AT 8:49 AM

WRENCHTECH

MECHANIC
20,757 POSTS

I suppose the speedo could go out of calibration but I have never seen it happen.

I know you said nothing mechanical has been changed but also make sure no program updates were done to the computer either. The speedo calibration can be altered that way also.