Car Worked on-- Mileage DROPS

[jfischer51]

2000 5spd w/75k My check engine light came on. Honda replaced the computer. Then Honda and
I replaced the 02 sensor.
Now the assist kicks in much more frequently, the batteries never charge all
the way, and mileage has gone from 65 to 47. Ideas??



John F.

[IamIan]

Alter the way you drive to compensate for the change to the car....

or get MIMA discussed here:
viewtopic.php?f=4&t=7188

further details here:
http://www.99mpg.com/mima/people/

[uhtrinity]

That drop sounds excessive. I would take it back to the shop and have them double check their work.

[ibjeff]

I don't know the solution, but you are not the first that has posted this mpg drop after new computer.

[atlaw4u]

Have you checked the air pressure in your tires as the dealer may have dropped the psi. This would not account for such a drastic drop but it may be a place to start.

[E27006]

Have they performed the proper reset procedure, in the correct sequence, for the BCM?

This problem was first mentioned in IC 5 or 6 years ago, the cars were leaving the service bay with the computer "lost in space". If so, take it back and insist they refer to the workshop manual

malcolm

[biododge1]

It is possible that the new ecm just needs to "relearn". After a reset, it defaults back to base programing-after some driving items like timing etc will change and the mpg will improve.

[freezin4]

Same problem here. New ECM seems to bring on a more agressive assist, and a more sluggish recharge. I also cannot get more than 19 bars on my SOC battery indicator.

One thing I will try later on this afternoon is a manual recal, by disconnecting the battery. I will be driving about 200 mailes afterward, so I will report my observations afterwards.

[freezin4]

Same problem here. New ECM seems to bring on a more agressive assist, and a more sluggish recharge. I also cannot get more than 19 bars on my SOC battery indicator.

One thing I will try later on this afternoon is a manual recal, by disconnecting the battery. I will be driving about 200 mailes afterward, so I will report my observations afterwards.

[JoelR]

I have a similar problem. I took the car in after receiving a notice from Honda for the ECM replacement. Our mileage on our 2001 5sp Insight was about 55mpg average (down from 60mpg a year ago). I had them adjust the valves at the same time. Car now is @ 51mpg over the ~70 miles since the service. We're seeing same charging situation as described above (e.g. never fully charges, aggressive use of IMA). Overall, the car feels slower, struggles when starting from a dead stop, etc.

I haven't seen anyone post a resolution/cause for this yet. Any help is appreciated.

Thanks,

Joel