"loewent via CarKB.com" <u10197@uwe> wrote in news:6cf8ceccf3e79@uwe:

> Just an aside, I drove from Topeka KS to OK City once, about 130-140
> kph.... I left my gas cap in Topeka by accident.
>
> Never caused a CEL.... and it didn't affect mileage, that trip is
> 475kms, I only put in 8.5 gallons.
>
> 98 civic 5-spd, had about 165000 on it at the time, back in 2003.
>



This is a perfect complement to the monitor "readiness flags" issue.

If your MIL did not illuminate even with the gas cap off, then the ECM
never did its EVAP self-test. You would think it would have run a test
during such a long drive, but it did not.

This is why it is sometimes necessary to do the official "drive cycle" to
get all the self-tests to run so the monitors will all report "ready", and
why it's a bad idea to clear all the flags by disconnecting the battery.


--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/